Allied A96US2V - Integrated Control Diagnostic Codes (E400-E409)

507404-02Page 72 of 80 Issue 1448
Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover
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 power reset.
E401 LSOM - Compressor long run cycle or
low system pressure.
Compressor ran more that 18 hours to satisfy a single thermostat de-
mand. 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). Out-
door 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 shore, bearings are
seized, excessive liquid refrigeration, etc. Clears the error after 4 con-
secutive normal run cycles or power reset.
E405 LSOM - Compressor open circuit. Compressor circuit open (due to power disconnection, open fuse, etc.)
Clears the error after 1 normal compressor run cycle.
E406 LSOM - Compressor open start circuit. Required amount of current is not passing through Start current trans-
former. 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 trans-
former. 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 com-
pressor run cycle or after power reset.
E409 LSOM - Compressor low voltage. Secondary voltage s below 18VAC. After 10 minutes, operation is
discontinued. Clears the code after voltage is higher than 20VAC for 2
seconds or after power reset.