506052−01 11/09
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Alarm Codes and Troubleshooting
Alarm ID
Action required to Clear/Recover
Message 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.
table continued on next page