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Table 19. Alert Codes and Troubleshooting
Initial notification of critical alerts will pop-up on the home screen and will be listed under notification menu. Minor and moderate alerts are found only under the notification menu. Moderate alerts
are not e-mailed to Homeowners. Dealers will get an email and code can be seen on thermostat under the installer notification section.
NOTE:
Anytime the word
DEVICE
or
DEVICE2
is used in this table, it will be replaced on all alert code notification screens with the actual offending device name, for example, thermostat, heat
pump, etc.).
Alert
Code
Inverter
Flash
Code
Priority
Condition
Applicable
Component
Actual Displayed
Alert Text
Component or System Operational State and Troubleshooting Tip
532
Moderate
IHarmony
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
Moderate/
Critical
iHarmony Zone
Sensor 1
Zone 1 Temp
Sensor Problem
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
Moderate/
Critical
iHarmony Zone
Sensor 2
Zone 2 Temp
Sensor Problem
544
Moderate/
Critical
iHarmony Zone
Sensor 3
Zone 3 Temp
Sensor Problem
545
Moderate/
Critical
iHarmony Zone
Sensor 4
Zone 4 Temp
Sensor Problem
551
Critical
Zone Sensor
and iHarmony
Lost
Communications
Any lost communication between any zone sensor and the damper control module will result in applicable alert code(s) being
displayed (543, 544 or 545) at the thermostat.
• A pop-up display on the thermostat 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.
Once communication is reestablished the zone sensor will return to normal zone operations.
594
Moderate /
Critical
Equipment
interface
module
Pre-Coil Air temp
Sensor Problem
Pre-coil discharge air temperature sensor problem (dual-fuel mode only). This alert code will escalate from moderate to critical
after ten (10) minutes. This may result in no heating or cooling operations.
Possible cause for alert code 594 is the interlock relay is energized, but no input is sensed after three seconds.
This may be resolve by de-energizing the interlock relay and re-energized five minutes later if demand is still present.
Alert code automatically clears five minutes after fault is cleared.
