68
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
227
Service Soon
GF Low
Pressure Switch
Open in Run
Mode
The furnace low pressure switch is open while in run mode.
• Check pressure (inches w.c.) of low pressure switch closing during a heat call.
• Measure operating pressure (inches w.c.).
•
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.
• 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 after the issue is
corrected.
228
Service Soon
GF Inducer
Calibration Issue
The furnace control is not able to calibrate the pressure switch. Unable to perform pressure switch
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 additional information.
Automatically clears after a
successful calibration.
229
Information
Only-Dealer
Ignition on High
Fire
•
Furnace control switched to high fire ignition because low fire pressure switch did not close in
allowed time.
•
*Early models only, if fan is on when call for W1 is initiated; unit will fire on high fire for 60
seconds before dropping down to low fire.
No action is required.
240
Service Soon
GF Low Flame
Current - Run
Mode
This could be either low flame current or a loss of flame while in run mode.
•
Check micro-amperes of the flame sensor using thermostat or control board.
•
Clean or replace the flame sensor.
•
Measure voltage of neutral to ground to ensure good unit ground.
• Clean face of burner assembly.
•
Confirm that the vent termination is properly installed and not recirculating.
•
Check for loose a wiring connection at gas valve.
NOTE:
Refer to Service and Application Note H-14-06“ Flame Rectification In All Gas Furnaces”
for additional information.
Automatically clears after a proper
micro-amp reading has been sensed.
