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Page 48 of 64
5.0 TROUBLE SHOOTING
SYMPTOM
POSSIBLE CAUSE
CORRECTIVE ACTION
I. Pilot will not light after
repeated triggering of the
piezo ignition button
A. No spark at electrode (weak or not heat source for pilot ignition)
1. Improper ignition
1. Align the electrode with 1/8” (3mm) gap
to pilot hood
2. Poor connections at starter
and ignition electrode
2. Reconnect if loose
3. Broken ceramic cover on
ignition electrode
3. Replace pilot assembly
4. Defective piezo igniter
4. Replace piezo igniter
5. Poor grounding of piezo igniter
5. Tighten mounting nut and/or igniter
screws
B. No gas or low gas pressure
1. Gas line shut off(s) may not be
turned on
1. Turn on shut-off valves
2. Air in gas lines
2. Purge gas lines
3. Gas lines may not be
connected
3. Connect all gas lines
4. Low pressure may be caused
by bent line
4. Check for a kinked line
5. Valve control knob not fully
depressed in “PILOT” position
5. Fully depress control knob
II. Pilot will not stay lit after
following the lighting
instructions
A. Thermocouple / Valve
1. Weak or improperly located
pilot flame
1. Adjust and clean pilot. The flame must
impinge on or engulf the thermocouple.
2. Defective thermocouple
2. Replace thermocouple
3. Thermocouple not installed
properly
3. Make sure all wire connections at the gas
valve terminals are tight and the
thermocouple is fully inserted into the
mounting bracket
4. Open wire connection in pilot
circuit
4. Check wire continuity and connections in
the pilot circuit
5. Defective Valve
5. Connect the millivolt meter probes to the
thermopile terminals on the gas valve.
Turn the valve to the “PILOT” position,
depress, and light. If the meter reading is
greater than 540 millivolts after 30
seconds, the thermopile is good. If the
pilot does not stay lie, the valve is
defective. Check section “B” below,
before replacing valve
Pilot will not stay lit after
following the lighting
instructions continued …
B. Defective safety circuit
1. Loose or defective
connections
1. Check continuity, tighten wiring or
connections, and repair
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