Problem
LED Flashing
23
Yes
Yes
Yes
Yes
Two Times
Indicates Burner
Flame Failure.
Ignition Does
Not Occur, or
Heater Does
Not Stay Lit.
Is
Proper Fuel
Supplied to Heater
Inlet?
Connect Proper Gas
Supply to Heater. Open All
Fuel Supply Valves.
Yes
No
Is
Proper Gas
Pressure Supplied
at Heater
Inlet?
Are
High Limit
Switches Tripped?
Perform Continuity
Check.
Yes
Yes
Does Igniter
Spark?
Defective Gas Valve.
Replace Gas Valve.
Is Igniter High
Voltage Lead
Connected?
Connect High
Voltage Lead
Yes
Yes
Is Igniter
Properly
Gapped?
A. Check High Voltage Lead for
Continuity and Tight Connections.
Replace if Defective.
B. Defective, Improperly Gapped, or
Dirty Igniter. Replace, Regap, or
Clean Igniter.
C. If A and B Above are Good,
Replace Ignition Control Module.
Igniter should be positioned
12.7 mm above casting and
centered over burner slot.
If High Limit Switches
are Tripped, Reset the
Switch(es) and
Determine Cause of
High Limit Tripping.
(See “Important Notes”
on page 25.)
Remove Burner Orifice
and Clean Hole with a Soft
Brush or Compressed Air.
Replace Orifice if
Necessary.
Check Igniter Gap
and Regap, if
Necessary, to 3 mm.
Provide Proper Gas Supply
and Pressure to Heater.
Refer to Dataplate.
Is 24
Volts Supplied
to Gas Control
Valve?
Defective Wires or Connections.
Repair or Replace.
Replace Ignition Control Module.
No
No
No
No
No
No
No
No
Does
Gas Control
Valve Open? (Turn
Unit On. Audible Click
Should be Heard
When Valve
Opens.
Is 24
Volts Supplied
from the Ignition
Control
Module?
No
Yes
Is
Igniter Properly
Positioned over
Burner Slot?
Do
You Have a
Sufficient Fuel
Supply Connected
to the
Heater?
Yes
Refer to Page 10 of This
Manual For Information
On Supplying Proper
Fuel Supply.
No
Has Heater
Been Properly
Shut Down?
Refer To Proper
Shut Down Instructions
in Manual (page 14)
and on Heater.
Yes
No