17
Problem 22
Inner
Combustion
Cone
Lights,
but
will
not
Stay
Lit
Did you
Allow Sufficient Time
for the Thermocouple
to Warm Up?
Is
the Gas Hose
Partially
Plugged?
Allow 30 - 60
Seconds Warm-Up
Before Releasing
Pilot Button.
Remove the Component
and Clean It.
Yes
No
Yes
Yes
Yes
Is
Thermocouple
Defective?
Check Millivolt Output of Thermocouple with
Millivolt Test Kit. Output Should be at Least 4
mv D.C. A Reading of Less Than 4 mv D.C. Can
Cause Inner Cone to Go Out. If Thermocouple
is Weak, Replace it.
Is Safety
Control Valve
Defective?
Are
Bypass or Main
Burner Orifices
Plugged?
Remove Orifices and
Clean Them
Check Gas Pressure to the Heater
Inlet with a Gas Gauge. Proper
Pressure at High Heat Should
Read 5 PSIG.
No
No
No
Is Thermo-
couple Contact Nut
Tightened Securely
into Gas Control
Valve?
Snug Contact Nut in Place.
(Do Not Overtighten.)
Check for Debris Between
Contact of Thermocouple
and Electromagnet of
Valve.
Yes
No
Is Button
on Safety Control
Valve Fully
Depressed?
Depress the Button on the
Pilot Safety Valve until Gas
Flows Through.
Yes
No
Check Drop-Out of Electromagnet in Safety Control
Valve with the Millivolt Test Kit. The Valve Magnet
Should Drop Out at 2.0 mv D.C. If the Magnet
Drops Out above 2.0 mv D.C., Replace the Safety
Control Valve.
Yes
Is
Proper Gas
Pressure Supplied
to the
Heater?
No
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