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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
240
Moderate
Furnace
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.
241
Critical
Furnace
Flame Out of
Sequence - Still
Present
Flame sensed without call for gas heating. Perform the following:
• Shut off gas.
•
Check for a gas valve leak.
•
Check for voltage to gas valve.
•
Replace the gas valve if needed.
• Automatically clears when a heat call ends successfully.
250
Moderate
Furnace or
zoning dampers
Primary Limit
Switch Open
The furnace primary limit switch is open. If limit switch is not closed within three minutes, the unit will go into a 60 minute soft
lockout (Watchguard mode). Perform the following:
• Check for high gas pressure.
•
Check for low supply air. Low supply air 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.
NOTE:
If this issue occurred on an iHarmony zoning system, the field will need to manually activate the zoning.
Automatically clears when a heat call ends successfully.
252
Moderate
Indoor unit or
iHarmony
Discharge Air
Temperature High
A discharge air-temperature is high. Perform the following:
•
Check temperature rise, air flow and input rate.
•
Check for dirty air filter(s).
NOTE:
See Service and Application Note ACC-14-01 for further details.
Automatically clears when a heat call ends successfully.
