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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 shor
t 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 and ground-
ing. 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 Limit
Switch or Flame Rollout 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 previous status code or status code #11 (1 short and 1 long flash) if
there was no pre
vious code.
After the control repeats the code 4 times, the
control will go through
a brief component test sequence.
The inducer will start
and r
un for the entire component test.
The HSI, b
lower motor F
AN speed
(AMBER LED boards only) HEA
T speed, and COOL speed will run f
or 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 s
witch.
Replace transformer.
Does the control
respond to
W, Y1 (if present),
Y/Y2, and G (24V) thermostat signals?
R
un system
through
a
heating
or
cooling
cycle
to chec
k operation.
Status codes are erased
after 72 hours
.
On RED LED boards stored
status codes can also be erased whene
ver
(115V or 24V) is interr
upted.
Replace furnace control.
Close door switch and go back to START.
Is circuit breaker closed?
Check for continuity in wire from circuit breaker
to furnace.
Close circuit breaker and go back to START.
Check room ther
mostat or
interconnecting cab
le
.
Is 24V present at
W,
Y
1 (if present), Y/Y2 or
G thermostat terminals on
the
furnace
control?
Disconnect all the thermostat wires from the
fur
nace control.
Does the prob
lem repeat when using
a jumper wire?
The thermostat is not compatible with the
fur
nace
control.
Either i
nstall a
ballast resistor
,
connect the Com24V ther
mostat terminal to
the thermostat, or replace the thermostat.
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YES
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NO
START
TROUBLESHOOTING GUIDE
NO
A05107
58MCB