20
Problem
LED Constant On
LED LLight
Not OOn
Normal Operation
Is Selector
Switch Set to
Heat?
Is Fan Running?
Set Selector
Switch to Heat
Yes Yes
No
Yes Yes
Yes
Is
Temperature
Control Set
Above Room
Temperature?
Set Control Above
Room
Temperature.
Is
Temperature
Control Defective?
Check for
Continuity.
Is Proper
Voltage Supplied
to Heater Power Cord
and Through
Power
Cord?
Replace Temperature Control.
Does Heater
Light?
Are 24 Volts
Supplied from
Transformer?
No
No No
No No
Yes
Is
Proper
Voltage Supplied to
Transformer?
No
Yes
Yes
No See “One Time Flash”
L.E.D. Light is Defective. Replace Ignition Control.
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 Transformer
No
Are 24 Volts
Supplied to
Ignition
Module?
Poor Electrical Connection or Broken Wire
Present. Repair or Replace.
Replace Ignition Module.
Check Electrical
Connections and Power
Supply to Transformer.
Repair as Necessary.
HEATING MODEYes