Lennox icomfort Setup Manual page 34

Alarm ID Message Name
313 Indoor/Outdoor Unit Capacity Mismatch
345 Relay O Failure
346 HP Jumper not Removed
347 Relay Y1 Failure
348 Relay Y2 Failure
349 IFC Error Check Jumper O to R
350 Electric Heat not Configured
351 Electric Heat Stage 1 Problem
352 Electric Heat Stage 2 Problem
353 Electric Heat Stage 3 Problem
354 Electric Heat Stage 4 Problem
355 Electric Heat Stage 5 Problem
400 LSOM Compressor Internal Overload Tripped
401 LSOM Compressor Long Run Cycle
402 LSOM Outdoor Unit System Pressure Trip
403 LSOM Compressor Short−Cycling
404 LSOM Compressor Rotor Locked
405 LSOM Compressor Open Circuit
406 LSOM Compressor Open Start Circuit
407 LSOM Compressor Open Run Circuit
408 LSOM Compressor Contactor Welded
409 LSOM Compressor Voltage Low
506052−01 11/09
Alarm Codes and Troubleshooting
Action required to Clear/Recover
Incorrect indoor/outdoor capacity code selected. Check for proper configuring in installation instructions. Alarm
is just a warning. The system will operate, but might not meet efficiency and capacity parameters and alarm
would clear when commissioning is exited.
O relay / Stage 1 failed (Pilot relay contacts did not close or the relay coil did not energize),
Configuration jumper(s) not removed on control board cut O−R. Applicable with non communicating outdoor unit
with communicating indoor system.
Y1 relay / Stage 1 failed (Pilot relay contacts did not close or the relay coil did not energize),
Y2 relay / Stage 2 failed (Pilot relay contacts did not close or the relay coil did not energize),
Configuration link R to O needs to restored Applicable in non communicating mode,
Heat call with no configured or mis−configured electric heat. Check for proper configuring under Configuring
Electric Heat Stages in the air handler installation instructions.
Heat section / Stage 1 failed (Pilot relay contacts did not close or the relay coil in the electric heat section did
not energize).
Heat section / Stage 2 failed (Same as Code 351).
Heat section / Stage 3 failed (Same as Code 351).
Heat section / Stage 4 failed (Same as Code 351).
Heat section / Stage 5 failed (Same as Code 351).
Compressor protector is open. Check for high head pressure, check compressor supply voltage.
Outdoor unit power disconnect is open.
Compressor circuit breaker or fuse(s) is open.
Broken wire or connector is not making contact.
Low or high pressure switch open if present in the system.
Compressor contactor has failed to close.
Compressor ran over 18 hours on one room thermostat demand.
Outdoor unit pressure trip. Check dirty coil, fan motor, refrigerant charge.
Compressor short cycling (Running less than 4 minutes).
Check capacitor, wiring, hard−start kit, replace compressor.
Check compressor for hot (cool down), check pressures, fan motor etc. Replace compressor if unable to get
circuit to close and compressor to operate.
Replace contactor.
Check power to unit.
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