Does Igniter Spark?
20
Problem 11
Heater
Does
Not LLight
Is
Proper Voltage
being sent from
ON/OFF Switch to
High Limit
Switch?
Is an
Audible “Click”
Heard When Solenoid
Valve is Supplied
Voltage?
Check for Voltage
and Resistance of
Switch and Electrical
Leads Between
Switches and Ignition
Control. Replace if
Defective.
Yes
No
Yes
Inner Combustion Cone , Venturi
Tube or Main Burner Orifice are
Plugged with Dirt. Clean the
Heater According to Prescribed
Cleaning Methods in Owner’s
Manual
Is High
Limit Switch Sending
Voltage to Ignition
Control?
Check for Tripped High
Limit Switch. A Limit
Switch Trips Due To:
-- Excess Gas Pressure
-- Heater Not Cleaned
-- Heater Not Properly
Hung.
Reset the High Limit
Switch and Determine
Cause of Tripping.
No
No
Is ON/OFF Switch
on Heater Positioned
to ON?
Position the
Switch to ON.
Yes
No
Is
Proper Voltage
Supplied to Heater
Power Cord?
Provide Proper Voltage
to Power Cord.
- Check Circuit Breakers
- Make sure building
environment control
thermostat is working
properly and calling for
heat
Yes
No
Yes
No
Yes
Replace Gas Solenoid
Valve
Remove Igniter According to
Instructions in this Owner’s
Manual
- Check it for Cracks in its
Ceramic Base
- Clean Igniter Electrode
with Emery Cloth or Steel
Wool
- Check Gap of Igniter to
Burner Cone. Should be
.100 - .200 in.
Is Proper
Voltage Being
Sent through Power
Cord to On/Off
Switch?
Yes
No
Check all Leads of
Power Cord for
Resistance.
Replace Power
Cord if Necessary.
Is Proper Voltage
Supplied to Solenoid
Valve on Heater?
Replace Ignition
Control According to
Instructions in this
Owner’s Manual
No
Yes
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