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Close door switch and go to start.
Is circuit breaker closed?
Is red LED status light on?
Is red LED status light blinking
rapidly without a pause?
Is door switch closed?
Is there 115v going to switch?
Replace control board.
Replace door switch.
Is red LED status light blinking
ON/OFF slowly with a
combination of short and long
flashes?
Check for correct line voltage
polarity. If units are twinned,
check for proper low-voltage
(24v) transformer phasing.
Check for previous fault by
momentarily shorting the TEST
terminal and the "C" terminal until
the LED goes out. LED will flash
the status code of any previous
fault or the code 11 (ONE
SHORT AND ONE LONG
FLASH) if no previous fault. After
the control repeats the code 3
times, it will sequentially operate
inducer motor, HSI, blower motor
relay heat speed, and cool speed
for approximately 10 - 15 sec,
then go off.
Determine status code. The
status code is a 2 digit number
with the first digit determined by
the number of short flashes and
the second digit by the number of
long flashes.
Once status code is determined,
the control will go through a brief
component test sequence by
operating inducer motor, HSI,
blower motor relay heat speed,
and cool speed for approximately
10-15 sec, then go off.
Was there a previous fault code
other than No. 11?
Run system through a heating or
cooling cycle to check operation.
Status codes are erased after 48
hrs or whenever power (115v
or 24v) is interrupted.
Go to section with status code
determined.
Is there 115v at L1 and L2?
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
NO
NO
YES
YES
YES
START
Is there 24v at SEC-1 and SEC-2?
NO
TROUBLESHOOTING GUIDE
Replace transformer.
Close circuit breaker and
go back to start.
NO
Check for continuity in wire from
circuit breaker to furnace.
YES
10