19
Table 2. 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
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 re-circulating.
•
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
Service
Urgent
GF 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
Service Soon
GF 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 Lennox Smart Zoning zoning system into non-zone mode.
NOTE:
See ACC-14-01 for further details.
Automatically clears when a heat call ends
successfully.
NOTE
: If this issue occurred on an Lennox
Smart Zoning zoning system, the field will
need to manually activate the zoning.
252
Service Soon
ID 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.
270
Service
Urgent
GF Flame Failed
To Ignite
The furnace is in Watchguard mode. The furnace igniter cannot turn on the flame. This is a five
strike condition during a single demand.
•
Check for proper gas flow.
•
Ensure that igniter is lighting burner.
•
Check flame sensor current.
•
Check for dirty filters.
•
Check for blocked cold end heater box or condensate drain and cracked hoses.
Automatically clears on successful igni-
tion.
