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Integrated Control Diagnostic Codes (continued)
Code
Diagnostic Codes/Status of Equipment
Action Required to Clear and Recover
Indoor blower motor temperature is too high.
Indoor blower motor over temperature (motor
tripped on internal protector), Check motor bear-
ings, amperes. Replace if necessary.
Discharge error sensor failure − No error if disconnected. Only shown if
shorted or out−of−range.
Discharge air temperature(DATS) out of range,
code is activated during "Field test mode".
Heat rate reduced to match indoor blower air flow. Replace filter or repair
duct restriction.
Furnace blower in cutback mode due to restricted
airflow. Check filter and ductwork. To clear replace
filter if needed or repair/ add ductwork.
Restricted air flow in cooling or continuous fan mode is lower than cfm
setting.
Restricted airflow − Indoor blower is running at a
reduced cubic feet per minute (Cutback Mode) −
The variable speed motor has pre−set speed and
torque limiters to protect the motor from damage
caused by operating out of its designed parameters
(0 to 0.8 inches water column total external static
pressure). Check filter and ductwork. To clear re-
place filter if needed or repair/ add ductwork.
Indoor or outdoor unit capacity mismatch.
Incorrect Indoor /outdoor capacity code selected.
Check for proper configuration in installation instruc-
tions. Alarm is just a warning. The system operation
is not impacted at all and alarm would clear when
Commissioning is exited.
Global network connection − Communication link problem.
For Future Use.
No 24 Volt output on Y1 to C with non−communicating outdoor unit.
Y1 relay / Stage 1 failed (Pilot relay contacts did not
close or the relay coil did not energize).
No 24 Volt output on Y2 to C with non−communicating outdoor unit.
Y2 relay / Stage 2 failed (Pilot relay contacts did not
close or the relay coil did not energize).
No 24 Volts between R & O with non−communicating outdoor unit (Dual
fuel module required for heat pump application).
Configuration link R to O needs to be cut on control
board.
LSOM − Compressor ran more than 18 hours in air conditioning mode.
Compressor protector is open. Check for high head
pressure, check compressor supply voltage. Out-
door unit power disconnect is open , compressor
circuit breaker or fuse(s) is open, broken wire or
connector is not making contact. Low or high pres-
sure switch open if present in the system. Compres-
sor contactor has failed to close.
LSOM − Outdoor unit system pressure trip.
Compressor ran over 18 hours in air conditioning
mode.
LSOM − Compressor short−cycling (Running less than 4 minutes).
Outdoor unit pressure trip. Check dirty coil, fan mo-
tor, refrigerant charge.
LSOM − Compressor rotor locked.
Compressor short cycling (Running less than 4 min-
utes).
LSOM − Compressor open circuit.
Check capacitor, wiring, hard start kit , replace com-
pressor.
LSOM − Compressor open start circuit.
Check compressor for hot (cool down) , check pres-
sures, fan motor etc. Replace compressor if unable
to get circuit to close and compressor to operate.
LSOM − Compressor open run circuit.
LSOM − Compressor contactor is welded.
LSOM − Compressor low voltage.
Replace contactor.
