Regular Dealer Maintenance; Diagnostic Chart - Payne PG8UAA Operation And Maintenance Manual

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If for some reason the vent is blocked, the draft safeguard switch will shut off the furnace. Reset the switch by pushing the button located
on top of the switch. (See page 2 or 3 for switch location.)
If the switch trips a second time, turn off the furnace and call for service.
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DOWNFLOW/HORIZONTAL ONLY—Check the manual-reset auxiliary limit switch (when used) located on the blower housing. If the
blower motor fails, this switch will shut off the furnace. Reset it by pushing the button on the switch. If it trips again, turn off the furnace and
call for service.
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Check the manual-reset limit switch(es) located near the burners. If the furnace has experienced a high-temperature condition, due to inad-
equate combustion air, these switches will shut off the furnace. Reset the switch(es) by pushing the button on the switch. If the switch trips
a second time, turn off the furnace and call for service.
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If your furnace still fails to operate, call your servicing dealer for troubleshooting and repairs. Tell your dealer the model and serial numbers
for your furnace. (You should have them recorded on page 11 of this booklet.) By knowing exactly which furnace you have, the dealer may
be able to offer suggestions over the phone, or save valuable time through knowledgeable preparation for the service call.

REGULAR DEALER MAINTENANCE

In addition to the type of routine maintenance you might be willing to do, your furnace should be inspected regularly by a properly trained
service technician. An annual inspection (or biennial inspection, at least) should include the following:
1. Inspection of all flue gas passages—including the burners, heat exchanger, relief box, and vent pipe.
2. Inspection of all combustion and ventilation air passages and openings.
3. Close check of all gas pipes leading to (and inside of) your furnace.
4. Inspection, cleaning, and lubrication (when required) of the blower motor and wheel.
NOTE:
Refer to the unit Service Procedures for blower motor oiling information. When required, the motor must be oiled by a qualified
service technician.
5. Routine inspection and cleaning/replacement of the air filter.
6. Inspection of all supply- and return-air ducts for obstructions, air leaks, and insulation. Any problems found should be resolved at this time.
7. Inspection of furnace installation for proper support and any obvious deterioration of the furnace. The support must be sound and without
sags, gaps, cracks, etc., around the furnace base so as to provide an air seal between the support and furnace.
8. A check for loose connections attaching individual components. Inspection of all electrical wiring and their connections.
9. Operational check of the furnace and safety controls to determine working condition. Repair or adjustment should be made at this time.
10. Clean flame sensor.
Ask your servicing dealer for further details about an economical service contract that covers seasonal inspections.
This furnace has an LED operation and status code display to aid the installer, service technician, or homeowner while installing or
servicing the unit. The LED code can be seen by viewing LED through the view port in the blower access panel.
NOTE: Removing the blower access panel or turning off the 115-v electrical power supply will terminate LED diagnostic code
display.
To decipher the meaning of the LED code, and suggested action, the following cross-reference can be used.
FAULT
CODE FAULT CODE DESCRIPTION
Power Interruption or Furnace Powered Up
12
During a Call for Heat
13 or 33 Limit Switch Lockout
Ignition Lockout or
14 or 34
Ignition Proving Fault
24 Furnace Violet-colored 3 amp Fuse Open
31 Pressure Switch Not Closed
21, 22, or 23 Any Other Fault Code
No Fault
Furnace Fails to Operate and No Fault is
Code
Signaled
Signaled
NOTES:
1. Light on continuously means control has power and is working properly.
2. The fault code is a 2 digit number. The first digit is determined by the number of short flashes of the light and the second digit is determined by
number of long flashes of the light.

DIAGNOSTIC CHART

CHECKLIST
Blower will run for 90 sec before furnace starts a normal heating cycle.
Check for dirty air filter.
Check for blocked return-air or supply-air grilles.
Check to be sure manual shutoff valve in gas supply pipe is in the open position. (Follow start-up
procedure if you open gas line.)
NOTE: Turn off the electrical supply and remove access doors before continuing with this checklist.
Check to be sure control switch or knob on gas valve is in ON position. (Follow start-up procedures if
you must reset switch or knob to ON.)
Check for blown fuse and possible short in 24-v wiring.
Vent restriction or high winds.
Combustion air supply.
Call dealer for service.
Check thermostat for proper temperature setting.
Check for blown house fuses and circuit breakers.
Check to be sure blower access panel is properly in place.
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