User Manual

Two Times
Differential air pressure switch contacts have not closed. Indicates no air proving in fan section of heate
r
Is
pressure switch
stuck open? Check
continuity.
Yes
No
Is
fan loose on
motor shaft?
Yes
Tighten fan blade set screw
Is
proper
voltage supplied
to fan motor?
No
Yes
Defective motor. Replace motor
Is
ignition module
receiving proper
voltage?
No
Defective ignition module. Replace module.
Yes
Defective wiring or connections to motor. Repair or replace wiring and connections
No
Provide proper voltage.
Check electrical supply,
circuit breakers, etc.
Is
proper
voltage supplied
to heater?
Yes
No
Red LED Flashing
One Time
Differential air pessure switch contacts are closed before fan motor starts.
Is pressure switch
stuck closed?
Check continuity.
Yes
No
Replace air-proving switch
Defective wire or loose
connection
to air pressure switch. Repair
as needed
Ensure copper or clear pressure switch tubes are not plugged or kinked. Check differential air pressure orifices. If plugged, clean with air pressure. Pressure switch out of calibration, replace pressure switch.
25
Is
burner box
gasketing torn, or
missing?
No
Yes
Replace burner box gasketing. ensure proper sealing of all burner box compartments.
No