508033-02 Issue 2135 Page 15 of 48
Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover
E348 No 24 Volt output on Y2 of ”integrated
control” with non?communicating outdoor
unit.
Y2 relay / Stage 2 failed. (Pilot relay contacts did not close or the relay coil
did not energize; no input back to IFC chip). Critical Alert. Cleared after reset
and Y1 input sensed.
E349 No 24 Volts between R & O on ”integrated
control” with non communicating outdoor
unit (Dual fuel module required for heat
pump application
Conguration link R to O needs to be restored. Replace link or hard-wire.
Applicable in non communicating mode. Critical Alert.
E370 Interlock switch sensed open for 2 minutes. Control sees the loss of 24VAC for 2 minutes.Terminate all services and wait
for interlock switch to close. The alarm will clear when 24VAC is continuously
sensed on DS terminal for a minimum of 10 seconds or on a power reset.
E400 LSOM - Compressor internal overload
tripped.
Thermostat demand Y1 is present; but, compressor is not running. Check
power to outdoor unit. Clears the error after current is sensed in both RUN
and START sensors for at least 2 seconds, or after service is removed, or
after power reset.
E401 LSOM Compressor long run cycle or low
system pressure.
Compressor ran more than 18 hours to satisfy a single thermostat demand.
Critical Alert. Clears the error after 30 consecutive normal run cycles or
power reset. Also monitors low pressure switch trips.
E402 LSOM - Outdoor unit system pressure trip. Discharge or suction pressure out-of-limits, or compressor overloaded.
Clears the error after 4 consecutive normal compressor run cycles.
E403 LSOM - Compressor short-cycling.
.(Running less than 4 minutes). Outdoor
unit pressure trip
Compressor runs less than 3 minutes to satisfy a thermostat demand. Clears
the error after 4 consecutive normal run cycles or power reset.
E404 LSOM - Compressor rotor locked.
Compressor short-cycling. (Running less
than 4 minutes).
Compressor rotor locked up due to run capacitor short, bearings are seized,
excessive liquid refrigerant, etc. Clears the error after 4 consecutive normal
run cycles or after power reset.
E405 LSOM - Compressor open circuit. Compressor circuit open (due to power disconnection, open fuse, etc.)
Clears the error after 1 normalcompressor run cycle.
E406 LSOM - Compressor open start circuit. Required amount of current is not passing through Start current transformer.
Clears the error after current is sensed in START sensor, or after power
reset.
E407 LSOM - Compressor open run circuit. Required amount of current is not passing through Run current transformer.
Clears the error after current is sensed in RUN sensor, or 1 normal
compressor run cycle, or after power reset.
E408 LSOM - Compressor contactor is welded. Compressor runs continuously. Clears the error after 1 normal compressor
run cycle or after power reset.
E409 LSOM - Compressor low voltage. Secondary voltage is below 18VAC. After 10 minutes, operation is
discontinued. Clears the code after voltage is higher than 20 VAC for 2
seconds or after power reset.
Table 5. Integrated Diagnostic Codes/Status of Equipment
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