Install Instructions

71
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 >
Notications
Component or System Operational State and Troubleshooting Tip How to clear alert code
275
Service
Urgent
GF Flame Out
Of Seq. No
Flame
The furnace ame is out of sequence. The system will go into Watchguard mode.
• Shut off gas.
• Check for gas valve leak.
Automatically clears on successful
ignition.
276
Service
Urgent
GF Calibration
Failure
The furnace is not able to calibrate or the high pressure switch opened or failed to close in run
mode. The system will go into Watchguard mode.
• Measure operating pressure (inches 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 information.
Automatically clears when the
furnace calibrates itself successfully.
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
specications.
Automatically clears on successful
ignition
291
Service
Urgent
GF Heat Airow
Below Min
The heating airow is below the minimum required level. The system will go into Watchguard
mode.
• Check for dirty air lter(s) and other air ow restrictions.
• Check blower performance.
Automatically clears when a heat call
ends successfully.
292
Service
Urgent
ID Blower Motor
Start Fault
The indoor unit blower motor will not start. The system will go into Watchguard mode.
• Indoor blower motor unable to start.
• This could be due to seized bearing, stuck wheel, and obstructions.
• Replace motor, motor module or wheel if assembly does not operate or meet performance
standards.
NOTE: Refer to Service and Application Note H-17-02 “All Communicating Variable Speed
Motors”.
Automatically clears after the indoor
blower motor starts successfully.
294
Service
Soon/Service
Urgent
GF Inducer
Motor
Overcurrent
There is over current in the furnace inducer motor. The system will go into Watchguard mode.
• Check combustion blower bearings, wiring and amps.
• Replace furnace inducer motor if it does not operate or does not meet performance standards.
Automatically clears after inducer
motor current is sensed to be in-
range after the ignition following
either Watchguard mode or unit
reset.