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Is AMBER LED stat us light on?
Is there 24V at SEC-1 and SEC-2?
Is there 115V at L1 and L2?
Replace furnace control.
Is door switch closed?
Replace transformer.
Replace door switch.
Is there 115V going to switch?
Close door switch.
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.
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
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 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, medium-
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
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
SEY SEY SEY
YES
START
YES
YES
NO
NO
NO
NONO
NO
NO
NO
NO
NO
NO
Troubleshooting Guide
A07581
58MVC