Before You Call For Service…
Troubleshooting Tips
Save time and money! Review the charts on the following pages first and you may not
need to call for service.
Problem Possible Causes What To Do
Display not on Is there power to unit? Verify that there is 120 Vac to Control Board.
Is display not completely installed? Make sure that the two pins on the back of the
display are inserted into circuit board.
Is harness from control board connected? Make sure that wire harness from Control
Board is still connected.
Blower does not run No power to blower motor. Verify power to Control Board and that all
harnesses to the blower are properly installed.
Make sure that there is no damage to harness
or connectors.
Unable to light
the main burner
Air in gas line. Let the unit cycle at least three times to
remove air from gas line. If unit does not try to
light, contact a qualified service technician to
purge the air from the gas line.
Manual Gas Shut-off
valve(s) not open.
Check to make sure that all manual gas shut-
off valves between unit and gas line are open.
Blocked Inlet or Exhaust
Vent pipe.
Contact a qualified Service Technician to
evaluate vent pipes for blockage.
Pressure Switch. Make sure the pressure switch hoses are not
"kinked" or disconnected.
Blocked inlet or outlet vent systems will cause
pressure switch to shut off unit. Contact a
qualified Service Technician to evaluate vent
system.
Wire Connection not fully
secured.
Contact a qualified service technician to
confirm wire connections.
If the screen on the display is flashing, the burner did not
light. To reset the ignition sequence, press the "HELP"
button and then the "OK" button (see Display screen at
left). On initial startup, it might be necessary to clear the
"flashing" screen two or three times, to make sure that
the gas has made its way to the burner. If the unit has
been operating and then shows the flashing display, then
there is another issue to be resolved (unless gas has
been off).
Some basic trouble codes:
A01: burner did not light during three consecutive trials
for ignition.
A25: pressure switch did not close.
A26: pressure switch was not open on initial check.
E21: incorrect polarity on power supply.
28
To Next Page
Need help?
General
