START
Is LED status light on?
YES
Is LED status light blinking rapidly without a pause?
NO
Is 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?
TROUBLESHOOTING GUIDE
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| Is there 115V at L1 and L2? |
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| Is door switch closed? | ||||
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| YES |
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| NO |
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| Is there 24V at |
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| Is there 115V going to switch? | |||
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| YES |
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| YES | |
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| Replace furnace control. |
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| Replace door switch. | ||||
YES | Check for correct line voltage polarity. If units |
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| Replace transformer. | ||||
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| are twinned, check for proper |
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| (24V) transformer phasing. |
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NO | To recall status code briefly remove and reconnect one RED wire from the Limit | ||||||||
| Switch or Flame Rollout switch to display stored status code. On RED LED | ||||||||
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| control do not remove power or blower access panel before initiating status | ||||||||
| code recall. You can also recall the previous status code by momentarily shorting | ||||||||
| the TEST/TWIN terminal to Com24V terminal until the LED goes out. LED will | ||||||||
| flash the previous status code or status code #11 (1 short and 1 long flash) if | ||||||||
there was no previous code. After the control repeats the code 4 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 FAN speed (AMBER LED boards only) HEAT speed, and COOL speed will run for 10 – 15 seconds each. Gas valve and humidifier will not be turned on.
NO
Close door switch and go back to START.
NO
Is circuit breaker closed?
YES
NO
Check for continuity in wire from circuit breaker to furnace.
Close circuit breaker and go back to START. 
Check room thermostat or |
interconnecting cable. |
NO |
Go to section below for the status code that | YES | Was there a previous status code | NO | Does the control respond to W, Y1 (if present), | |
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was flashed. |
| other than #11? |
| Y/Y2, and G (24V) thermostat signals? | |
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| YES |
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Run system through a heating or cooling cycle to check operation. Status codes are erased after 72 hours. On RED LED boards stored status codes can also be erased whenever (115V or 24V) is interrupted.
Replace furnace control.
NO | Is 24V present at W, Y1 (if present), Y/Y2 or |
| G thermostat terminals on the furnace control? |
YES
Disconnect all the thermostat wires from the furnace control.
YES | Does the problem repeat when using | |
| a jumper wire? | |
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| NO |
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The thermostat is not compatible with the furnace control. Either install a ballast resistor, connect the Com24V thermostat terminal to the thermostat, or replace the thermostat.