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105706
DIRECT-VENT GAS FIREPLACE HEATER
VDVF36P and VDVF36ST Series
®
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
POSSIBLE CAUSE
1. No gas supply, or shut-off 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
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
Pa rt s, page 23)
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
Note:
For additional help, visit DESA
International’s Technical Service web
site at www.desatech.com.
www.desatech.com
Note:
Before troubleshooting the system,
make sure the gas shut-off valve is ON.
Continued
Note:
All troubleshooting items are listed in
order of operation.
WARNING: Turn off heater
and let cool before servicing. 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.