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506052−01 11/09
Page 34
Alarm Codes and Troubleshooting
Alarm ID Action required to Clear/RecoverMessage Name
313 Indoor/Outdoor Unit Capacity Mismatch 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.
345 Relay O Failure O relay / Stage 1 failed (Pilot relay contacts did not close or the relay coil did not energize),
346 HP Jumper not Removed Configuration jumper(s) not removed on control board cut O−R. Applicable with non communicating outdoor unit
with communicating indoor system.
347 Relay Y1 Failure Y1 relay / Stage 1 failed (Pilot relay contacts did not close or the relay coil did not energize),
348 Relay Y2 Failure Y2 relay / Stage 2 failed (Pilot relay contacts did not close or the relay coil did not energize),
349 IFC Error Check Jumper O to R Configuration link R to O needs to restored Applicable in non communicating mode,
350 Electric Heat not Configured 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.
351 Electric Heat Stage 1 Problem Heat section / Stage 1 failed (Pilot relay contacts did not close or the relay coil in the electric heat section did
not energize).
352 Electric Heat Stage 2 Problem Heat section / Stage 2 failed (Same as Code 351).
353 Electric Heat Stage 3 Problem Heat section / Stage 3 failed (Same as Code 351).
354 Electric Heat Stage 4 Problem Heat section / Stage 4 failed (Same as Code 351).
355 Electric Heat Stage 5 Problem Heat section / Stage 5 failed (Same as Code 351).
400 LSOM Compressor Internal Overload Tripped 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.
401 LSOM Compressor Long Run Cycle Compressor ran over 18 hours on one room thermostat demand.
402 LSOM Outdoor Unit System Pressure Trip Outdoor unit pressure trip. Check dirty coil, fan motor, refrigerant charge.
403 LSOM Compressor Short−Cycling Compressor short cycling (Running less than 4 minutes).
404 LSOM Compressor Rotor Locked Check capacitor, wiring, hard−start kit, replace compressor.
405 LSOM Compressor Open Circuit
Check compressor for hot (cool down), check pressures, fan motor etc. Replace compressor if unable to get
circuit to close and compressor to operate.
406 LSOM Compressor Open Start Circuit
407 LSOM Compressor Open Run Circuit
408 LSOM Compressor Contactor Welded Replace contactor.
409 LSOM Compressor Voltage Low Check power to unit.
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