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Is AMBER LED status light blinking ON/OFF
slowly with a combination of short and
long flashes?
Is AMBER LED status light blinking
rapidly without a pause?
Is AMBER LED status light on?
Deter
mine status cod
e. The status code is
a
2 digit number with t
he first
digit
determined
b
y 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.
YES
NO
YES
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 will flash the
status codes in the order of occurrence.
Record status codes until status code #11
flashes (1 short and 1 long flash). After status
code #11 flashes the status codes will repeat.
Status codes are erased after 72 hours or
can be manually erased by putting setup
switch SW1-1 in the ON position and
j
umpering R, W/W1, and Y/Y2 simultaneously
until status code #11 is flashed. When done
put setup switch SW1-1 in the OFF position.
Check for correct line voltage polarity.
If units are twinned, check for proper
lo
w-voltage (24V) transfor
mer phasing.
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/W1, W2, Y1,
Y/Y2, and G (24V) thermostat signals?
Replace fur
nace control.
NO
NO
NO
NO
Is 24V present at W/W1, W2, Y1, Y/Y2 or G
thermostat terminals on the furnace control?
NO
YES
YES
Replace furnace control.
Is there 24V at SEC-1 and SEC-2?
Is there 115V at L1 and L2?
YES
NO
YES
YES
NO
YES
NO
YES
Run system through a
low-heat, high-heat,
or cooling cycle to chec
k 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 flashed.
YES
NO
Close circuit breaker and go back to START.
Check for continuity in wire from circuit
breaker to furnace.
Is circuit break
er closed?
Is door switch closed?
Check room thermostat or
interconnecti
ng cable.
NO
YES
YES
NO
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.
Does the problem repeat when using
a jumper wire?
Disconnect all the thermostat wires from the
furnace control.
START
A02108A
Fig. 58 -- Troubleshooting Guide
315AAV