88
Is A MBER LED status light on?
Is ther e 24V at SEC-1 and SEC-2?
Is there 115V at L1 and L2?
Replace furnace control.
Replace transformer.
Replace door switch.
Isthere115Vgoingtoswitch?
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.
Is AMBER LED status light blinking
rapidly without a pause?
Check for correct
line
voltage polarity. If
units are
twinned, check for proper low-
voltage (24V) transformer
phasing.
Verify
unit is properly grounded.
Is AMBER LED status light blinking
ON/OFF slowly with a combination of
Determine status code. The status code
determined by the number of short
To recall previous status codes disconnect the R
thermostat connection, reset power, and put setup
switch SW1-1 in the ON position. The AMBER LED
are erased after 72 hours or can be manually erased
by putting setup switch SW1-1 in the ON position
and jumpering R, W/W1, and Y/Y2 simultaneously
setup switch SW1-1 in the OFF position.
Was there a previous status code other
than #11?
Go to section below for the status code
Does the control respond to W/W1, W2,
Y1, Y/Y2, and G (24V) thermostat
signals?
Run system through a low-heat, high-
heat, or cooling cycle to check operation.
Status codes are erased after 72 hours
or can be manually erased by putting
setup switch SW1-1 in the ON position
and jumpering R, W/W1, and Y/Y2
simultaneously until status code #11 is
Is 24V present at W/W1, W2, Y1, Y/Y2 or
G thermostat terminals on the furnace
control?
Check room thermostat or
interconnecting cable.
Disconnect all the thermostat wires from
the furnace control.
Does the problem repeat when using a
jumper wire?
Replace furnace control.
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.
YES
NO
YES
YES
YES
YES
YES
YES
START
YES
YES
NO
NO
NO
OO
NN
NO
O
O
NN
NO
NO
NO
Close the door switch.
YESYES
YES
A190174
Fig. 71 -- Troubleshooting Guide
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