22
Problem
LED Light
Not On
During a
Call for Heat.
Fan Motor
Does Not
Run, Heater
Does Not
Light.
Is Heater
Plugged In?
Is
Selector
Switch Set to
“Heat”?
Plug heater in.
Move the
Selector Switch
to the “Heat”
Position.
Yes
No
Yes
Yes
Yes
Yes
Is
Thermostat
Set Above Room
Temperature?
Set Thermostat
Above Room
Temperature.
Is
Thermostat
Defective? Check
for Continuity.
Is
Proper
Voltage Supplied
to Heater Power Cord
and Through
Power
Cord?
Check Dataplate for
Electrical Supply
Requirements. Provide
Proper Voltage From
Electrical Supply. Check
Circuit Breakers in
Building Electrical
System. Check Power
Cord for Continuity.
Replace Thermostat
Replace Selector Switch
Are 24 Volts
Supplied from
Transformer?
Replace
Transformer
No
No
No
No
No
No
Yes
Is Circuit
Breaker
Receiving 24
Volts?
Check Wiring.
Repair as
Necessary.
Replace Ignition Control Module.
Yes
Is
Proper
Voltage Supplied to
Transformer?
Check Electrical
Connections and
Power Supply to
Transformer.
Repair as Necessary.
No
Yes
No
Is
Circuit Breaker
Delivering 24 Volts to
the Ignition Control
Module?
Reset Circuit Breaker
and Determine Cause
of Circuit Breaker
“Opening”. If circuit
Breaker Does Not
Reset, Replace the
Circuit Breaker.
Yes
Yes
Is
Selector
Switch Defective?
Check for
Continuity.
No