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25
HEATING/BURNER SYSTEM – NATURAL GAS OR LIQUID PROPANE FIRED
Problem Probable Cause Remedy
Pilot will not light, burner
will not fire
Burner switch not on Turn switch on
Trigger not pulled Pull trigger. Burner should
fireonlywhen trigger is
pulled
Gas valve turned off Turn gas valve on
No voltage to valve Check for 24 VAC between
pilot valve(PV) and PV/MV.
Valve will operate between
20.5 and 28.5 VAC
Pilot orifice plugged Remove orifice & clean
Defective ignition module Check for 24 VAC incoming
@ 24V & 24V ground. (If you
get voltage to module, but
not through module, replace.)
Defective transformer Check for 24V output. If no
voltage, replace
Defective flow switch Replace
Defective thermostat Replace
Faulty Cam switch Replace
Igniter not working Test for spark. Test for
continuity between ignition
wire and ground
WARNING: High voltage
igniter can cause electrical
shock
Pilot lights, but burner will
not fire
Check for 24 VAC between
main valve (MV) and PV/MV
If no VAC @ valve, replace
module. If you get voltage,
replace valve
Burner fires, but goes out Check for continuity between
ignition cable and ground
wire
Assure good ground
Faulty ignition module Replace module
Excess draft Protect from windy
conditions
NG or LP odor is present
WARNING: Check all NG
/ LP connections with soap
solution beforeoperation.
Gas leak ahead of valve Turn gas off. Call gas
supplier
Lockout not working Replace module
Valve stuck Turn main gas valve off.
Replace valve
Discharge water
temperature to high
Faulty thermostat Replace
Water restriction Clean or replace spray
nozzle, descale coil, remove
obstructions
Incoming gas pressure to
high
Lower gas pressure
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