Troubleshooting Guide - Payne PG8MAA Installation And Operating Instructions Manual

START
Is LED status on?
light
YES
,_ls there 115V at Lt and L2?
_ YES
I ls there 24V at SEC-1 and SEC-2?
_ YES
Replace furnace control,
,-,_,_ Is door switch closed?
_ YES
I Isthere t15V going to switch?
_ YES
l [ Replace door switch.
v
pause?IS LED status light blinking rapidly without a
Check for correct line voltage polarity. If units
are twinned, check for proper low-voltage
(24V) transformer phasing.
•_ Replace transformer.
" Is LED status light blinking ON/OFF slowly
w th a comb nat on of short and ong flashes? I y
I
/
YES
2 digit number with the first digit determined
_" Determine status code, The status code is a
_' by the number of short flashes and the second
_° d g t by the number of ong f ashes?
_" wasG° tofashedsecti°n below for the status code that F I
T _YES _Was there a previous status code
other than #tt?
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 #t t (t short and ! 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 t0 t5 seconds each.
Gas valve and humidifier will not be turned on.
___ oes the control respond to W, Y1 (if present)
Y/Y2, and G (24V) thermostat signals?
V YES
I 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
(t 15V or 24V) is interrupted.
I Replace furnace control,
-,_,_,_ Is door switch closed?
I
-"_ Is circuit breaker closed? p
II YES
J Check for continuity in wire from circuit breaker
to furnace, I
I I Close circuit breaker and go back to START. I_
I
Check room thermostat or I
interconnecting cable,
I
' NO
___ls 24V present at W '¢1 (if present) Y/Y2 or
I
G thermostat terminals on the furnace control? I
I
, YES
Disconnect all the thermostat wires from the
I
furnace centre, I
I
l
___ oes the problem repeat when using
a jumper wire?
_ 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,
NO
A02106a