User guide

Problem
LED Flashing
One Time
Flash pattern begins immediately, fan motor does not run. Heater does not light.
Is air-proving switch
arm or paddle binding
on housing? Is there
an obstruction in
heater outlet?
Is air-
proving switch
shorted? (Perform
continuity check on air-
proving switch.)
Yes
No
Yes
Replace air-proving switch.
Long Flash Two seconds on, two seconds off repetitively for 15 minutes.
Heater has attempted three ignition trials. Heater is in a 15 minute wait period before attempting three more trials for ignition. If ignition is not achieved after the seciond set of ignition trials, the heater will lock out and the ignition control module’s LED will give a three time flash pattern. disconnect the heater from its electrical supply, and reconnect it to restart the heater and identify cause of failure.
22
Repair and/or remove obstructions. check for damaged fan housing. Clean or repair as needed.