Desa VDVF36PN/PP - Manual (Page 25)

105706-01B
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25
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TROUBLESHOOTING
OBSERVED PROBLEM
Pilot will not light
No gas to burner, although wall switch and
valve are set to the ON position
Frequent pilot outage
Burner goes off after a short time
When ignitor button is pressed, there is no
spark at pilot
POSSIBLE CAUSE
1. No gas supply, or shutoff valve is OFF
2. Air in gas line
3. Construction debris clogging pilot orifice
4. Low gas pressure
5. Control valve knob is not on the PILOT
position
6. Kinked pilot line
7. Bad valve
8. Bad thermocouple or loose connection
1. Wall switch wires defective
1. Pilot flame may be too low, causing
safety pilot to “drop out”
1. Venting recirculation problem
1. Ignitor electrode not connected to igni-
tor cable
2. Ignitor cable pinched or wet
3. Piezo ignitor nut is loose
4. Broken ignitor cable
5. Bad piezo ignitor
6. Ignitor electrode broken
7. Ignitor electrode positioned wrong
REMEDY
1. Check to see if you have gas supply
2. Hold control valve in the PILOT position
for 2 to 3 minutes to purge air. If you smell
gas stop and wait for a few minutes before
trying to light the fireplace
3. Remove debris and dirt, inspect and
clean any other possible obstructions
4. Contact your gas supplier
5. Refer to section on pilot lighting
6. Have a qualified technician replace pi-
lot line
7. Replace control valve (see Replacement
Parts, page 24)
8. Tighten thermocouple or replace
1. Check electrical connections
1. Clean and adjust pilot flame for maximum
flame impingement on thermopile
1. Have a qualified technician check vent-
ing system for leaks or obstructions.
Have a qualified technician measure the
pilot’s millivoltage
1. Reconnect ignitor cable
2. Free ignitor cable if pinched by any
metal or tubing. Keep ignitor cable dry
3. Tighten nut holding piezo ignitor. Nut
is located behind the mounting bracket
4. Replace ignitor cable
5. Replace piezo ignitor
6. Replace pilot assembly
7. Replace pilot assembly
Note: For additional help, visit DESA International’s
Technical Service web site at www.desatech.com .
Note: Before troubleshooting the system, make sure the
gas shutoff valve is ON.
Note: All troubleshooting items are listed in order of
operation.
WARNING: Turn off heater and let cool before servic-
ing. Only a qualified service person should service and
repair heater.
CAUTION: Never use a wire, needle, or similar object to
clean pilot. This can damage pilot unit.
TROUBLESHOOTING