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A02106a
Is LED status light on?
Is LED status light blinking rapidly without a
pause?
Is LED status light blinking ON/OFF slowly
with a combination of short and long flashes?
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?
Go to section below for the status code that
was flashed.
Is there 115V at L1 and L2?
Is there 24V at SEC-1 and SEC-2?
Replace furnace control.
Check for correct line voltage polarity. If units
are twinned, check for proper low-voltage
(24V) transformer phasing.
To recall status code briefly remove and reconnect one RED wire from the draft
safeguard switch to display stored status code. On RED LED 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 status
code of the previous fault or status code #11 (1 short and 1 long flash) if there
was no previous fault. 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.
Was there a previous status code
other than #11?
Is door switch closed?
Is there 115V going to switch?
Replace door switch.
Replace transformer.
Does the control respond to W, Y1 (if present),
Y/Y2, and G (24V) thermostat signals?
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.
Is door switch closed?
Is circuit breaker closed?
Check for continuity in wire from circuit breaker
to furnace.
Close circuit breaker and go back to START.
Check room thermostat or
interconnecting cable.
Is 24V present at W, Y1 (if present), Y/Y2 or
G thermostat terminals on the furnace control?
Disconnect all the thermostat wires from the
furnace control.
Does the problem repeat when using
a jumper wire?
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.
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START
TROUBLESHOOTING GUIDE
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