START
Is red LED status light on?
YES
NO
Is there 115v at L1 and L2? | NO | |||
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| NO | ||
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Is there 24v at | ||||
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| YES |
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Replace control center. |
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Troubleshooting Guide
Is door switch closed? | NO | ||
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| YES |
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| NO | |
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Is there 115v going to switch? | |||
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YES
Replace door switch.
Replace transformer.
Close door switch and go to start.
Is circuit breaker closed? |
| NO | ||
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| YES |
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| Close circuit breaker and | ||
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Is red LED status light blinking rapidly without a pause?
NO
Is red LED status light blinking ON/OFF slowly with a combination of short and long flashes?
YES
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.
YES
NO
Check for correct line voltage polarity. If units are twinned, check for proper
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 No. 11 (1 short and 1 long flash) if no previous fault. After the control repeats the code 3 times, the control will go through a brief component test sequence. The inducer will start and run for the entire component test. The HSI, blower motor heat speed, and blower motor cool speed will run for
Was there a previous fault code other than No. 11?
YES
NO
Does control respond to W, Y, | NO | |
or G |
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| YES |
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Check for continuity in wire from circuit breaker to furnace.
Check room thermostat or interconnecting cable.
NO
Is 24 vac present at W, Y, or G terminals on the control?
YES
Go to section with status code determined.
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. |
Replace control if it does not respond to
A99123a
