93
Table 19. Alert Codes and Troubleshooting
GF= Gas Furnace, AH=Air Handler, ID=Indoor unit (GF or AH), HP=Heat Pump, AC=Air Conditioner, OD=Outdoor Unit (AC or HP), PA=Pure Air S, ZA=Zone system and TS=Thermostat
Alert
Code
Inverter
Flash
Code
Priority
Condition
Actual Displayed
Alert Text
Under dealer
control center >
Notifications
Component or System Operational State and Troubleshooting Tip
How to clear alert code
530
Service Soon
ZS Low Damper
24VAC Voltage
•
Check 24VAC voltage to all dampers.
• Check 24VAC damper transformer.
• Check connections.
Replace transformer if applicable.
532
Information
Only-Dealer
ZS Zoning
Pressure Switch
Opened (High
Pressure)
Zoning Pressure Switch Opened (high pressure).
•
Compressor pressure is above the specified limit.
• Compressor is turned off.
• Zoning will be restored once the high pressure switch closes.
Occasionally we get this with an AC system and the fix is to just jump out the pressure switch
terminals on the damper control module board.
Automatically clears after compressor
pressure is within limits.
542
Service Soon
ZS Zone 1 Temp
Sensor Fault
Possible Causes:
• Zone temperature sensor reading out of range.
• Check for loose or incorrectly wired connections at the zone sensor or damper control module
terminals.
•
Open or short zone temperature sensor detected for more than five second.
• More than one zone sensor has the same assigned 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 communicating thermostat to critical. System will continue to
operate in central mode.
•
At the Lennox communicating thermostat, only zone 1 screen will be available.
NOTE:
The Lennox communicating thermostat will display the alert code as “Problem (Zoning
Control)”. Email notifications will describe the issue as “ Zone “X” Temp Sensor Problem.
Automatically clears 30 seconds after
condition no longer exist.
543
Service Soon
ZS Zone 2 Temp
Sensor Fault
544
Service Soon
ZS Zone 3 Temp
Sensor Fault
545
Service Soon
ZS Zone 4 Temp
Sensor Fault
546
Service Soon
ZS Parameters
resetting from
restored power
An EEPROM is a memory device that stores and remembers the information even after power
has been removed from the device. It saves settings that the user might have selected like to
desired heating and cooling temperatures. When power is removed and then comes back on, the
zone sensors (or thermostat for zone 1) remembers what the users setting were. Code 546 is
given if the zone sensor notices that the EEPROM has an issue right after power is first applied.
The system will set itself to energy save mode and continue to operation
Zone sensor will have to be replaced.
