Lennox 19V30 Installation And Setup Manual Download Page 1

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507536-08 10/2021

Supersedes 8/2021

Lennox Industries Inc.

Dallas, Texas, USA

iComfort

S30

Ultra Smart Thermostat

Installation and Setup Guide

Summary of Contents for 19V30

Page 2: ...idity on the Home Screen 45 Displaying the Outdoor Sensor Temperature on the Home Screen 45 Displaying the Indoor Humidity on the Home Screen 45 iHarmony Zoning 45 PureAir S 45 Ventilation ERV HRV and Fresh Air Damper 45 Ventilation Rates 45 Energy Recovery Ventilator ERV 46 Heat Recovery Ventilator HRV 46 Fresh Air Damper 46 Zoning Application 46 Operation of Fresh Air Dampers with Environmental ...

Page 3: ...d Storage Environment Electrical and Dimensions Operating temperature is 32 F to 176 F 0 to 80 C Shipping and storage temperature range is 4 F to 140 F 20 C to 60 C Operating humidity range is 10 to 90 non condensing at 104 F 40 C Storage humidity range is 5 to 95 non condensing at 104 F 40 C Smart Hub Power Input 24VAC 1AMP at 60Hz Smart Hub Power Output to HD Display 12VDC Dimensions H x W x D H...

Page 4: ... alert which needs attention Amber Wi Fi Error Blinking amber LED indicates either Wi Fi is not connected no Wi Fi is within range or and Wi Fi hardware error Could also indicate intermittent Wi Fi connection Magenta Thermostat Error Blinking magenta LED indicates HD display not connected See Table 4 Communication Error Troubleshooting HD Display to smart hub Cyan HVAC Error Indoor unit is not con...

Page 5: ...ons Terminal Designation Description Thermostat Wiring Typical Wiring R 24VAC input 18AWG unshielded Indoor Unit Controller Outdoor Unit Smart Hub R i I C ACC1 ACC2 18 or 22AWG shielded 18AWG unshielded 18 or 22AWG shielded 18 or 22AWG shielded 18AWG unshielded 12V 12V A B HD Display Subbase COMMBUS A B 18 AWG Unshielded Shield wire needs to be connected to a common C terminal Connect shield wire ...

Page 6: ...d outdoor location away from direct sunlight or other heat sources usually on the north side of the building Ensure that water will neither collect on nor wash over the sensor Do not locate the sensor near driveways or similar heat absorbing masses which may reflect stored heat energy onto the sensor and send inaccurate information to the thermostat Locate the sensor away from attic and soffit ven...

Page 7: ...sible Recommended minimal distance is 15 feet 4 6 meters Unused wires Unused wires COMMBUS A B 12V 12V A B Single wire to bundle wire to indoor terminal C Single wire to indoor unit terminal C Unused wires Single wire to terminal C Indoor Unit Controller Outdoor Unit S30 Smart Hub HD Display Subbase R i I C ACC1 ACC2 Figure 3 Wire Termination in Communicating Systems Electrical Noise Typical Appli...

Page 8: ...r Handler Unit COMMBUS A B HD Display Subbase B A Heat Pump Only Cut Y1 Y2 on board link for 2 stage outdoor units Non communicating Cut R O on board link for outdoor heat pump units Non communicating Figure 6 iComfort S30 Lennox Communicating Air Handler with 24VAC 1 or 2 Stage Heat Pump or Air Conditioner AB ODT FLOAT Switch DH DH Gh Rf Cf Gs Y W HVAC EQUIP DH C G R NC NO NC NO SPDT RELAY ི ཱ ཱི ...

Page 9: ... T T IHARMONY ZONING SYSTEM To Smart Hub To indoor unit To iHarmony If unable to connect two wires to indoor unit terminals then pigtail wiring as exampled here COMM BUS A B S30 Smart Hub HD Display Subbase DATS UP TO THREE IN ZONE THERMOSTATS ARE SUPPORTED ACC1 ACC2 iComfort Outdoor Unit If TSTAT terminal is present DO NOT use A B Figure 8 iComfort S30 Lennox Communicating Indoor and Outdoor Unit...

Page 10: ...t of the HVAC system operation refer to UV light installation instruction Humidity Control Applications Lennox communicating thermostats can sense humdiity and controls both 24VAC H and 120VAC H outputs to cycle humdifier based on demand No other control or humidistat is required Optional outdoor air temperature sensor for use with humidifier if not already in the system for other function and are...

Page 11: ...ure and indoor humidity are within the limits of the ventilation controller NOTE Set the communicating thermostat fan mode operation to Circulate and adjust duration to match control ventilation time duration 26L56 CURRENT SENSING RELAY 120VAC COIL RELAY 24VAC LVCS DAMPER TRANSFORMER VENTILATION DAMPER OUTDOOR TEMPERATURE SENSOR NEUTRAL EAC ACC 120VAC Smart Hub COMMBUS A B HD Display Subbase B A F...

Page 12: ...OX COMMUNICATING THERMOSTAT OR DAMPER CONTROL MODULE CONVENTIONAL TERMINALS FLOAT SWITCH LENNOX COMMUNICATING INDOOR UNIT LENNOX COMMUNICATING INDOOR UNIT CONVENTIONAL OUTDOOR UNIT 1 OR 2 STAGE LENNOX COMMUNICATING FURNACE UNIT SLP99 EL296 and SL280 FOR FLOAT SWITCH OPERATION CUT R DS Figure 11 Installing iComfort S30 Communicating Indoor Unit Float Switch HEPA Bypass Filter Interlock Kit Humidifi...

Page 13: ...C1 is always low stage for single and two stage ventilators LOW ON RED YEL GRN HI COM NO NC BLK HRV ERV Terminal Block COM CLOSE Fresh Air Damper 2 Wire Control Normally Open ACC1 ACC2 MAG MOUNT SMART HUB ACC1 ACC2 MAG MOUNT SMART HUB Wire jumper required between ACC 1 and R terminals COMMBUS A B COMMBUS A B Figure 13 iComfort S30 with Ventilation Fresh Air Damper ERV and HRV ...

Page 14: ...here is a direct path to the approximate location of the home Wi Fi access point the signal is not blocked by the indoor unit or duct work for example Can be attached to a vertical surface such as a wall stud or roof truss web or to a horizontal surface such as a floor or ceiling joist or a roof rafter Smart hub antenna should be positioned such that it is roughly vertical no matter the orientatio...

Page 15: ...small hole for thermostat wiring 3 8 10 mm Diameter Hole 5 Pull about three inches 75mm of thermostat wire through the opening and remove the outer thermostat wire jacket Seal wire hole in wall to prevent cold or hot air from affecting temperature sensor in display IMPORTANT Seal wire hole in wall to prevent cold or hot air from affecting temperature sensor in HD Display 6 Strip 1 4 6 mm insulatio...

Page 16: ... portals once registration has been completed 5 Do not remove the label covering the HD Display screen until after power is applied to the system Lennox Communicating Air Handler Electric Heat Configuration Auto Detection During the system initial commissioning the electric heat strips are auto detected and configured for the system If electric heat is added after the system had already been confi...

Page 17: ...eroconf a group of technologies that includes service discovery address assignment and host name resolution Mobile Device Operating System Requirements The iComfort Mobile Setup application is available for both IOS 6 0 and higher App Store and Android 4 1 and higher Google Play Establishing a Direct Wireless Connection to the Smart Hub IMPORTANT If the connection between the iComfort Mobile Setup...

Page 18: ... 8 Start the iComfort Mobile Setup application and make sure you are connected to the correct smart hub by checking the serial number 9 Touch the remote in tab on the iComfort Mobile Setup application home screen 10 If the system has not been commissioned it will launch the commissioning screen If the system has already been commissioned it will go to dealer control center 11 Once servicing is com...

Page 19: ...cation issue check all connections between the smart hub and HD Display subbase Also ensure HD Display is correctly mounted to subbase Apple HomeKit Wi Fi Accessory Configuration A pop up screen will appears providing instructions on how to connect the thermostat to the home Wi Fi network using an Apple IOS device If you wish to use this method to configure the unit for Wi Fi and Apple HomeKit the...

Page 20: ...er Fresh Air Damper 1 or 2 Speed ERV energy recovery ventilation 2 or 2 Speed HRV heat recovery ventilation Once completed touch done which will display the equipment found screen There the additional non communicating equipment will now be displayed along with the iComfort equipment Once completed touch continue Reminders This screen allows you to set reminders as either disabled or 3 6 12 or 24 ...

Page 21: ...ear and you can adjust the blower heating and cooling CFMs for that specifc zone Gray Blower CFM Red Heating CFM Blue Cooling CFM The green start button when selected will run the indoor blower at the designated CFM assigned When the green start button is selected the button when turn red and appear as exampled to the right Selected the button again and that will stop the blower and the icon will ...

Page 22: ...reset all equipment and reconfigure Use to display system notifications Use to run test on system components Use to run diagnostics on system components Use to display system information Exit to Home screen To navigate back to the dealer control center touch on the Dave Lennox icon when available on the top left hand side of the screen To navigate back to the previous screen touch on the left arro...

Page 23: ...g Max Dehumidification Overcooling Range is 0 10 Default is 4 Aux Heating Activation Threshold This is an adjustment to hasten or delay the aux heat activation This adjusts how far below the set point the temperature must fall with the HP at 100 before allowing electric heat to come on Range is 0 10 F 0 0 to 5 56 C with increments of 0 25 F 0 14 C The default setting is 2 5 F 0 83 C Definition Dep...

Page 24: ...um of three days to see if there is a pattern and compare it to the hottest day on record for that zip code before triggering an notification It must see a pattern before it will trigger the notification There may be a component or components that will require attention The sensitivity threshold selection options are OFF LOW MEDIUM and HIGH The default is HIGH The alert code notification is 65545 ...

Page 25: ...he iComfort thermostat allows you to choose between 1 2 3 and 4 stages of heat Single stage heat first stage provides 100 of full capacity Two stage heat First stage provides 70 of full capacity 2nd stage provides 100 of full capacity Three stage heat First stage provides 60 of full capacity 2nd stage provides 80 of full capacity third stage provides 100 of full capacity Four stage heat First stag...

Page 26: ...nd stage HP heating when the outdoor temperature goes below the jumper pin setting Options are off 40 F 4 C 45 F 7 C 50 F 10 C and 55 F 13 C Default is off Max Heat Setpoint The highest temperature setting that the heat set point can be set on the thermostat Default is 90 0F 32 33 C Range is 60 0 to 90 0 F 15 56 to 32 22 C Adjustable in increments of 1 F 0 56 C Max Humidification Setpoint This set...

Page 27: ...ess than the minimum Heat Pump heating capacity of the outdoor unit The system will be cycled ON and OFF at the selected cycles per hour to maintain the settings of the iComfort thermostat This governs how many cycles per hour the system will try to run when it needs to run at less than minimum capacity Range is 4 to 10 cycles Default is 6 cycles Adjustments are in increments of 0 5 cycles Modulat...

Page 28: ...ted by 1 0 F 0 56 C Single Setpoint Mode SSP Non Zoning System Only On the user screens this is referred to as Perfect Temp Temperature Options are enabled or disabled Default is disabled The Single Set Point SSP algorithm allows the user the set only one temperature set point value rather than one value for heating and a different value for cooling When zoning is present the following SSP setting...

Page 29: ...and 6 F 3 36 C per hour for first stage compressor based heating or cooling With Smooth Set Back disabled the system will start a recovery at the programmed time Options are enabled or disabled Default is enabled The SSR set point calculation is as follows Current SSR CSP Current Program CSP Target Program CSP Current SSR HSP Current Program HSP Target Program HSP N N For New SSR HSP For New SSR C...

Page 30: ...operate Modifying this setting here will also change the feature status on the user settings screen Normal This setting cools or heats the home to the desired temperature setting Feels Like is OFF Comfort This setting cools or heats the home to the desired temperature setting Feels Like is ON When set to ON other parameters are modified to optimal settings for this feature Those setting changes wi...

Page 31: ...tion CFMs are capable of meeting the ASHRAE required ventilation volumes but the thermostat has no ability to control CFM from the HRV ERV The system first tries to satisfy the ventilation volume by only ventilating while conditioning is occurring Continuous fan is not considered conditioning The total volume of ventilation air is accumulated and stored to compare against the target hourly ventila...

Page 32: ... temperature reported is 1 F less than the lock out setting when display units are Fahrenheit or is reported as 0 5 C less than lock out setting when the display units are Celsius Wall Insulation Options are poor average and good Default is average Zone 1 through 4 First Stage Differential Differential is the temperature between when first stage will cycle ON and cycle OFF Example Zone 1 HD Displa...

Page 33: ...tions for delaying the first staging event even further since the starting point of the modulation gas heat in zoning is picked to be appropriate for the airflow being provided so this parameters allows an adjustment on top of the initial delay Range 3 0 8 0 minutes with a default 5 0 minutes Can be adjusted in 1 minute increments Zoning Minimum Zone Run Time Range is 90 to 600 seconds Default is ...

Page 34: ...Differential Stg3 Differential Stg2 Differential Heating Heat Pump with Electric 3 Stage 2 compressor 1 backup OR 1 compressor 2 backup H C Stages Locked Enabled H C Stages Locked Disabled 3rd stage ON 1st stage ON 2nd stage ON 4th stage ON 3rd stage ON 1st stage ON 2nd stage ON 4th stage ON Stg4 Differential 2nd stage OFF 3rd stage OFF 4th stage OFF 5 0 P S 0 1 P S 5 1 P S S T N I O P SP SP SP 2 ...

Page 35: ...part number Automatic Max Defrost Single and Two Stage Lennox Communicating Heat Pump Units When set to ON the system will always run at MAX DEFROST when accumulated compressor off time is longer than 30 minutes and ambient temperature is less than 35 F 1 6 C When ambient sensor temperature is higher than 40 F 4 5 C then defrost termination will be 90 F 32 C This option has two settings either ON ...

Page 36: ...tat terminates the furnace heating demand Repeat steps 3 and 4 while defrost is active terminating any running furnace heat demand when the HP indicates that defrost is no longer active or any time the heat pump stops i e pressure switch opens mode switch changes etc NOTE The on times above assume the minimum furnace ignition time of 35 seconds Dehum Airflow Adjustment Adder Lennox Variable Capaci...

Page 37: ...e compressor is turned OFF The range is 60 300 seconds Default is 300 seconds and with an incremental adjustment of 60 seconds When the system initiates a compressor short cycle delay the outdoor unit control s seven segment display will show the delay in minutes from 1 to 5 minutes The sequence is time minutes remaining and a dash and will repeat that cycle 5 4 3 2 and 1 until the count down is c...

Page 38: ...ent Name A unique name can be assigned to this component Name can be up to 29 characters Name can consist of letters numbers special characters and spaces Heating Indoor Blower Off Delay Heating Indoor Blower OFF Delay Electric Heat only Blower runs at continuous air CFM setting during delay timing period The range is 0 10 seconds Default is 10 seconds with an incremental adjustment of 1 second He...

Page 39: ...wer Off Delay The range is 60 180 seconds with a default setting base on equipment type match up Adjustment are increments of 10 seconds Heating Airflow Control Type Options for this setting are fixed CFM or fixed DAT discharge air temperature Default is dependent on equipment type match up Fixed CFM is selected as the Heating Airflow Control Type parameter default selection the circulator will op...

Page 40: ... information on unit code language supported equipment type name control software revision control model number control serial number control hardware revision protocol revision number device product level 24VAC average power consumption 24VAC peak power consumption compatible devices list application code memory size micro controller part number max number of zones supported damper types number o...

Page 41: ...trol will Perform a filter calibration upon indication of a filter change regardless of the value of this parameter Perform a UVA lamp calibration upon indication of a lamp change regardless of the value of this parameter Calculate UVA lamp life remaining regardless of the value of this parameter Alarms 504 and 503 will not be sent while this parameter is set to Off The Diagnostics screen on the t...

Page 42: ...en the automatic testing is complete the system returns to the consumer home screen A updated installation report is generated and available in Lennox Pros under the Homeowners account Manual Test Depending on hardware present various tests are available By default all items to be tested are enabled Selecting a specific test will un check the item When a specific set of tests are completed the res...

Page 43: ... changed Touch any item to change its contents A pop up screen will appear that will allow the information to be added or changed Information Required 1 Select desired language ENGLISH FRANÇAIS or ESPAÑOL 2 Select country region 3 Select time and date which includes time date time zone daylight savings time ON OFF 4 Temperature unit Fahrenheit or Celsius 5 Once completed press continue Home Addres...

Page 44: ...ystem keeps using the over cooling set point as its operating cooling set point will not wait for the temperature to rise to the normal cooling set point to run again until the dehumidification demand is satisfied Table 16 Dehumidification Control Modes of Operations Mode of Operation Option Description Dehumidification Only Available only with Max and Climate IQ Auto Variable Capacity Outdoor Uni...

Page 45: ...h the following Lennox equipment Lennox communicating variable speed or variable capacity variable capacity indoor and two stage or variable capacity modulating outdoor units Lennox communicating variable speed indoor unit and communicating or non communicating conventional single stage outdoor unit two zones maximum supported Lennox communicating variable speed indoor unit and communicating or no...

Page 46: ...f ventilation air delivered use this number regardless of the actual fan speed Zoning Application When ventilation is demanded in zoned applications without conditioning calls the fresh air damper will open and the blower will run at the lowest set zone CFM referred to above Ventilation while a zone is being conditioned is serviced simply by opening the fresh air damper while the zone system condi...

Page 47: ... installed communication devices 4 During commissioning you will end that process with the dealer control center screen From there touch equipment to modified any system or equipment settings 5 From the equipment list touch furnace From this furnace screen you will have access to the various airflow settings Set the system air volumes according to the needs of the home 6 When all CFM settings are ...

Page 48: ...handler screen you will have access to the various airflow settings Set the system air volumes according to the needs of the home 7 When all CFM settings are complete touch the back arrow at the top left hand of the screen to return to the dealer control center 8 Touch tests to access the test section 9 Here you will have another opportunity to adjust blower circulation heating and cooling circula...

Page 49: ...hermostat will check the system for installed communication devices 4 During commissioning you will arrive at the equipment found screen From there touch non communicating equipment to add non communicating equipment 5 From the add remove equipment screen touch either 1 Stage A C unit or 2 Stage A C unit 6 Touch done to return to the equipment found screen 7 Touch continue to proceed to the next s...

Page 50: ...s continue to proceed 11 The dealer control center will appear Touch tests to access the test section 12 Here you will have another opportunity to adjust blower circulation heating and cooling circulation air flows Use the plus or minus buttons to adjust up or down the CFM settings Once adjustments are completed touch continue 13 Under the touch test to run screen you may un check any tests not re...

Page 51: ... unit 6 Touch the done to return to theequipment foundscreen Touch continue to proceed to the next screen 7 Continue with the commissioning sequence When the set up airflow per zone screen appears you can adjust blower heating and cooling circulation air flows When done touch continue to proceed 8 The dealer control center will appear next Touch tests to access the test section 9 Here you will hav...

Page 52: ... the password to access your home Wi Fi network NOTE If you wish to see the characters you are typing check show password The thermostat will support up to a 63 character password 7 Press join Whether connecting to a visible or hidden network if successful a check mark will appear above both the router and Internet icons HOME WI FI ROUTER INTERNET ACCESS SERVER CONNECTION E30 THERMOSTAT Figure 21 ...

Page 53: ...aller to commission and service the system on any iPhone iPad and Android device Remotely turn the system on and off during setup Apple the Apple logo iPhone and iPad are trademarks of Apple Inc registered in the US and other countries Android is a trademark of Google Inc Use of this trademark is subject to Google permission Notifications Service and Alert Codes These screens provide information o...

Page 54: ...when a control has been replaced Reconfiguring the system should resolve this issue Sometimes Lennox communicating thermostat detects a new device or an existing device or a device on the system that is not communicating with the thermostat If this occurs an alert code 10 is activated and the thermostat sends a soft disable command to the offending device on the communications bus outdoor control ...

Page 55: ...ert code by reconfiguring the system 11 Service Urgent Missing Device The thermostat cannot find a previously installed system component Check all system components devices connections to make sure they are Lennox communicating compatible Cycle system power If problem persists then check all system components devices connections to make sure they are Lennox communicating compatible Go to menu sett...

Page 56: ...ncorrect parameter settings detected Dealer would need to re set the system and start configuration again Automatically clears once proper system configuration is completed 20 Service Urgent Protocol Upgrade Required The thermostat cannot work with one of the system devices because the thermostat firmware needs to be updated first Update thermostat firmware 21 Service Urgent Incompatible Equipment...

Page 57: ...cur during a power outage or power fluctuation in the system If persistent or if it coincides with the system operations then proceed with the following troubleshooting steps Check the power connections Check the amperage draw at the transformer possible overloaded Check 24VAC voltage at the system component device If the fault persists after checking the connections replace the applicable control...

Page 58: ... board NOTE See service and application note IAQ 10 01 for further details Transient Voltage Suppressor Part information Made by Little Fuse part number 5KP43CA bidirectional Transorb aka TVS Diode Please contact your FTC or inside technical support for help in acquiring the transient voltage suppressor if not available in your local electronics store 36 Service Urgent Heating when Not Requested T...

Page 59: ...aler control center diagnostics and press the start diagnostics button Check for other alert codes that may be preventing the system from operating as expected Check all heating equipment to determine cause Recycle power Automatically clears when the system detects that the issue no longer exists 39 Service Urgent No Cooling when Requested The system has not been able to turn on the cooling for mo...

Page 60: ...equipment smart hub and located HP Heating Lockout Time to verify the lockout time setting Check air flow to the zones or zones Check discharge air temperatures Check calibration of room thermostat Outdoor Unit and Zoning When the heat pump could not get a zone thermostat to progress 0 5 F towards the set point in 30 minutes the system will lock out the heat pump and switch to the secondary heat s...

Page 61: ...e and low voltage wiring transformer and equipment Check for incorrectly wired or loose or spliced connections between system components devices or units Make sure all unused wires are tied together and taken back to the C terminal on the indoor control board as shown in the installation and setup guide Disconnect all wiring to other system components except thermostat to indoor unit and reconnect...

Page 62: ...the errors will have something to do with the transformer s phasing input power or output loading amperage load For the air handler control only alert code 114 is generated only if the measured line frequency is below 57Hz or above 63Hz and remains out of range for 10 consecutive seconds We count power line cycles and determine line frequency every 1 second of time based on the processor s quartz ...

Page 63: ...etc to equipment Clears when control senses proper voltage 117 Service Soon ID Poor Ground The reporting unit has poor earth grounding Provide proper grounding for the system component device Check for proper earth ground to the system Reference Corp0123L10 for additional information Automatically clears 30 seconds after the issue is corrected 120 Service Soon Unresponsive Device There is a delay ...

Page 64: ...Urgent Control Hardware Problem There is a hardware problem on a system component control There is a control hardware problem In system using iHarmony zoning the system will remain in non zone mode all dampers open for five minutes after priority condition no longer exist In systems using a Equipment Interface Module remove jumper if present on indoor unit between R and W2 In systems using a PureA...

Page 65: ...ucer Fault Suction Pressure Transducer reading above 4 75V or below 0 25V for 24hrs 3hrs Run on staged operation Resets after 3 consecutive readings that are in range 182 Service Soon OD Suction Temperature Sensor Fault Reading below 0 25V or above 4 75V for 24hrs 3hrs System will continue to operate normally Resets after 3 consecutive readings that are in range 183 Service Soon OD Liquid Pressure...

Page 66: ...re is an issue with the furnace gas valve Check gas valve operation and wiring Check for voltage to the gas valve Automatically clears after the issue is corrected 205 Service Urgent GF Gas Valve Relay Contact Closed The furnace gas valve relay contact is closed Check wiring on control and gas valve The relay is located on the furnace control If issue continues replace furnace control Automaticall...

Page 67: ...enerate an email notification Once the fault is cleared typically seconds after being generated the subsequent call for heat will be initiated and the furnace will return to normal operation Lennox has not received any complaints of no heat situations associated with this operating condition It has been determined that occasionally the fault clears itself and the alert code is not stored in the IF...

Page 68: ...ch calibration Inspect vent for blockage and combustion air inducer for correct operation and restriction Check for blocked cold end heater box or condensate drain or drain strainers at outlet of cold end heater box CEHB Check for cracked hoses Check levelness of unit NOTE Check Service Manual and Service and Application Note H 13 07 Condensing Furnace Pressure Switch Troubleshooting for additiona...

Page 69: ...ir due to being plugged or restriction in system example dirty air filter or blockage in duct work Check for proper firing rate on furnace Check for non functioning zone dampers NOTE Limit trips will place the iHarmony zoning system into non zone mode NOTE See ACC 14 01 for further details Automatically clears when a heat call ends successfully NOTE If this issue occurred on an iHarmony zoning sys...

Page 70: ...ches w c Inspect vent for blockages and combustion air inducer for correct operation and restriction Check for blocked cold end heater box CEHB or condensate drain or drain strainers at outlet of CEHB and cracked hoses Check for cracked hoses Check levelness of unit NOTE Check Service Manual and Service and Application Note H 13 07 Condensing Furnace Pressure Switch Troubleshooting for additional ...

Page 71: ...ssfully 290 Service Urgent GF Ignition Circuit Fault There is a problem with the furnace ignition circuit The system will go into Watchguard mode Measure resistance of hot surface igniter Replace the hot surface igniter if it is not within specifications Automatically clears on successful ignition 291 Service Urgent GF Heat Airflow Below Min The heating airflow is below the minimum required level ...

Page 72: ...tem restart 311 Information Only Dealer GF Heat Rate Reduced To Match Airflow The heat firing rate has been reduced to match available airflow cutback mode This is a alert code Furnace blower in cutback mode due to restricted airflow Reduce firing rate every 60 seconds to match available CFM Check air filter and duct system To clear replace air filter if needed or repair or add additional ducting ...

Page 73: ...t detects the presences 24VAC it will trigger alert code 347 Possible cause for alert code 347 is Y1 relay on the applicable system component has failed Either the furnace pilot relay contacts did not close or the relay coil did not energize System operation will stop Possible Y1 relay stage 1 failure Furnace pilot relay contacts did not close or the relay coil did not energize NOTE There is no in...

Page 74: ...covered 352 Service Soon AH Electric Heat Stage 2 Fault There is a issue with the air handler s second stage electric heat Either the pilot relay contacts did not close or the relay coil in the electric heat section did not energize NOTE The air handler will operate on first stage electric heat until the issue is resolved Automatically clears after fault recovered 353 Service Soon AH Electric Heat...

Page 75: ...trols Non Communicating Mode NOTE The on board jumper DS R W914 will NOT be cut The furnace control has not received 24VAC power for two minutes or more on the DS terminal The system will not operate Dealer has cut the W914 jumper Dehum Harmony III on the Lennox furnace control The thermostat monitors the DS terminal in the furnace for power and if the link has been cut then power will be lost to ...

Page 76: ...en the unit will run in low speed An outdoor control with a seven segment display the outdoor control will display alert code 401 but continue to run in high speed If the outdoor unit is a heat pump and the outdoor temperature is less than 65 F alert code 401 is ignored Also monitors low pressure switch trips Automatically clears after 30 consecutive normal run cycles or power reset 402 Service So...

Page 77: ... down and closes at a specific pressure system restarts Automatically clears when the system detects that the issue no longer exists 411 Service Urgent OD Low Pressure Switch Strikes Lockout The low pressure switch has opened five times during one cooling or heating demand Thermostat will shut down the outdoor unit Open low pressure switch error count reached five strikes Check system charge using...

Page 78: ...re error count reached five strikes during a single demand Make sure coil is clean and airflow unobstructed in and out of condenser Check system charge using superheat and sub cooling temperatures Reset by putting outdoor control in test mode or resetting low voltage power Correct issue and cycle power to the system 416 Service Soon OD Coil Sensor Faulty The outdoor coil sensor is either open shor...

Page 79: ...nce of the discharge sensor and compare to temperature resistance chart located in the applicable unit installation and service procedure If sensor resistance is out of range then replace the discharge line temperature sensor If discharge sensor wring leads are located in the wrong connector pin out then order a replacement cable assembly Moderate Automatically clears after fault signal condition ...

Page 80: ... cap switch exceeding thermal limit Check condenser fan motor TXV and indoor unit blower motor Check for stuck reversing valve or clogged refrigerant filter XC XP25 Check to ensure that one of the wires from the top cap switch has not been disconnected from one of the TP terminals on the outdoor control Reconnect wire if disconnected Check superheat and sub cooling Automatically clears when error ...

Page 81: ...door control and restart 427 21 Service Soon Service Urgent OD Inverter DC Peak Fault The inverter has detected a DC peak fault condition If condition 55A or higher is detected outdoor unit will stop compressor and fan moderate condition Anti short cycle is initiated If peak current 55A or higher occurs 10 times within an hour system will lockout critical condition Inverter LEDs will flash code 21...

Page 82: ...nverter High Main Input Current The inverter has detected a high main input current condition If condition is detected outdoor unit will stop compressor and fan moderate condition Anti short cycle is initiated If condition occurs 10 times within an hour system will lockout critical condition Inverter LEDs will flash code 22 Refer to the unit service documentation for detailed troubleshooting proce...

Page 83: ...he demand Inverter LEDs will flash code 23 Refer to the unit service documentation for detailed troubleshooting procedures Perform test function and verify inverter DC link and line input voltage and current Also check input to filter board and reactor before replacing inverter board To perform this test go to menu settings advanced settings view dealer control center tests Inverter flash code 23 ...

Page 84: ... 26 The sequence is Red LED Two Flashes Green LED Six Flashes NOTE Inverter normal operations with no error code present is as follows Red LED is ON and Green LED is OFF Check refrigerant Replace outdoor control board Replace inverter To clear disconnect power to outdoor unit and restart 431 27 Service Soon Service Urgent OD Inverter PFC Fault The inverter has detected a PFC circuit over current c...

Page 85: ...ut critical condition Inverter LEDs will flash code 28 Refer to the unit service documentation for detailed troubleshooting procedures Inverter flash code 28 The sequence is Red LED Two Flashes Green LED Eight Flashes NOTE Inverter normal operations with no error code present is as follows Red LED is ON and Green LED is OFF Troubleshooting Suggestions Check wire connections U V and W at inverter p...

Page 86: ... automatically increases the compressor minimum speed below 45ºF in the heating mode and above 115ºF ensure the compressor capacity is sufficient for oil return If alert code 433 occurs and inverter does not indicate an inverter code 29 the Lennox communicating Lennox outdoor control triggered the alert code 433 Check the Lennox outdoor control software version by accessing the outdoor unit diagno...

Page 87: ...mmunication to the inverter when the alert code 434 occurs by cycling the outdoor unit contactor off for two minutes Upon energizing the contactor the Lennox outdoor control will attempt to communicate to the inverter for three minutes This process will be repeated three times in attempt to establish communication before locking out If the unit is locked out with a critical alert code 434 reset th...

Page 88: ...wer to outdoor unit and restart 436 62 Service Soon Service Urgent OD Inverter High Heat Sink Temperature Inverter heat sink temperature exceeded limit This occurs when the heat sink temperature exceeds the inverter limit Inverter will issue inverter alert code 13 first and slow down to try to cool the heat sink If temperature remains high outdoor unit will stop both compressor and fan moderate co...

Page 89: ...n will automatically clear when the inverter sends an alert code clear message Critical priority condition can be cleared by disconnecting and reconnecting power to outdoor unit to restart 438 73 Service Urgent OD Inverter PFC Input Over current The inverter has detected a power factor correction PFC circuit over current condition The inverter has detected an PFC over current condition This may be...

Page 90: ...a 5 6 speed reduction for a brief period of time and to reduce the heat sink temperature and will then resume normal operation This may occur at high outdoor temperatures above 110ºF for brief periods of time 3 4 minutes and is normal and expected operation of the inverter controlling the compressor safely within design parameters The inverter finned aluminum heat sink is located on the back side ...

Page 91: ...cases the alert code 441 notification does not require any additional service or diagnostic procedures The control sets indoor CFM and outdoor RPM to values according to demand percentage rather than the actual Hz Possible issue is system running at high pressures Check for high pressure trips or other alert codes in thermostat and outdoor control Inverter LEDs will flash code 14 Refer to the unit...

Page 92: ...sts Automatically clears 30 seconds after fault is recovered 501 Service Soon PA UV Sensor Fault Ultra violet UV sensor reports a fault for more than 5 minutes or UV sensor does not respond for more than 5 minutes Device will not perform any UV lamp life remaining calculations until fault has recovered Life remaining display shall indicate while fault exists Automatically clears 30 seconds after f...

Page 93: ...gned zone number Check zone sensor s zone number assignment System Response Both types of zone sensors will display as the indoor temperature on the main screen Damper control module will operate in central mode all dampers open in both moderate and critical priority conditions If after 10 minutes the condition does not change the applicable alert code 542 543 544 or 545 is escalate by the Lennox ...

Page 94: ...tat will appear indicating a communication error Indoor temperature for the specific zone in error will displayed as on the home screen When any zone sensor loses communication with the damper control module the entire system will go into central mode single temperature control Check for loose damage or incorrect wiring between damper control module and the zone sensor reporting alert code 551 Onc...

Page 95: ... then replace the HD display Automatically clears when the system detects that the issue no longer exists 701 Service Urgent Thermostat Temp Above Limit The thermostat is reading indoor temperatures above the pre programmed limit The thermostat has a built in non adjustable high limit of 99 F Cool thermostat Adjust set point Run reset all under dealer control center Replace HD display or mag mount...

Page 96: ...ifier pad reminder 3003 Maintenance Replace UV Bulb Not Applicable Reset UV Light reminder 3004 Maintenance Maintenance Reminder Not Applicable Make service appointment with dealer and reset reminder 3005 Maintenance Pure Air Maintenance Not Applicable Make service appointment for Pure Air maintenance with dealer and reset reminder 65537 Service Urgent Missing Base Base not detected and alarm 6553...

Page 97: ...n and 1 second off On the equipment interface module the green LED will flash 3 seconds on and 1 second off Cycling power to the soft disabled control may clear the condition If cycling power does not clear the soft disable state then replace control Automatically clears once is detected for two seconds 65540 Information Only Dealer Missing HD wall display HD wall display not detected for less tha...

Page 98: ...ating with smart hub Only on versions with mag mount Typically the thermostat will send a command to the unknown device and place it in a soft disable state The Lennox communicating control with the soft disable state will indicate so as follows On air handler furnace and outdoor controls the state is displayed by double horizontal lines on seven segment display On the damper control module the gr...

Page 99: ...m detects that only five or less smart hubs are detected in one group will the alert code automatically clears 65545 Service Soon Cooling Capacity Alert Cooling operation may not be sufficient for the hottest days Based on local conditions and climatological data for zip code EXAMPLE Dirty Filter Low Refrigerant charge TXV etc Symptom during mild temperatures may include system running longer than...

Page 100: ...e screen blank after initial power up The HD Display may take up to three minutes before anything appears on the screen due to a HD Display low battery condition HD Display battery charging only occurs when connected to the subbase System Checks YES NO 1 Is the Wi Fi connected 2 Can the homeowner access the consumer portal www myicomfort com from either a PC or tablet 3 Has the homeowner downloade...

Page 101: ...ed LennoxPros Dealer Dashboard The dealer dashboard displays Dealer s iComfort thermostat installations in one convenient location It is accessible through the Service Dashboard at www LennoxPros com The thermostat can be accessible via the Dealer Dashboard only after the dealership s main phone number or company name is added during thermostat commissioning Service Dashboard Search Screen Custome...

Page 102: ...he homeowner and Troubleshoot access to the Lennox Troubleshooting Center which includes error code lookups and any available documentation Equipment Reports Equipment Tab A detailed list of all installed equipment for a particular system Menus are available for each Equipment Type for Technical Documents Warranty Lookup and Repair Parts Reports Tab View Performance Reports Installation Reports an...

Page 103: ...ler 38 Furnace 39 Heat Pump 36 Smart Hub 25 Zoning Control 40 EvenHeat Discharge Temp 25 F Factory Reset Smart Hub 42 Thermostat 42 Fan Cycling 36 Freezing Alert Temperature 28 Fresh Air Damper 20 Fresh Air Dampers 45 G Gas Heat Control Mode SLP98 only 25 Gas Heating Activation Temp Difference 25 Group ID 25 H Heat Cool Stages Locked In 25 34 Heating Airflow Control Type 39 Heating Indoor Blower O...

Page 104: ... Smooth Setback Recovery SSR 29 Soft Disable 55 Stage Delay Timers 29 30 Differentials 30 Subbase Installation 15 T Temperature Control Mode 30 32 Temperature Unit Selection 20 Temp Reading Calibration 30 Tests 42 Troubleshooting Wi Fi Connection 52 V Ventilation Control Mode 46 Control Mode Parameters 30 Control Wiring 13 Filter 20 Maintenance 20 Reminders 20 W Wall Insulation 32 Wide Setpoint 41...

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Lennox 19V30, Installation And Setup Manual

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