12
105704
VENTED TYPE DECORATIVE APPLIANCE
VGL450 Series
®
TROUBLESHOOTING
The two most common causes of a malfunctioning gas appliance are:
1. Loose wiring connections
2. Construction debris clogging the pilot and/or gas control valve filter
OBSERVED PROBLEM
Cannot light pilot
Pilot will not stay lit
No gas to burner, although wall switch and
valve are set to the ON position
Frequent pilot outage
Pilot goes out when wall switch is ON
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
1. Loose wiring on thermopile to regula-
tor valve. No millivolt current is being
sent back to regulator
2. If valve knob and wall switch are in the
ON position, probable defective regula-
tor valve
1. Wall switch wires defective or too long
2. Pilot not generating sufficient
millivoltage
1. Pilot flame may be too low, causing
safety pilot to “drop out”
1. Millivolt output on thermopile too high
REMEDY
1. Check to see if you have gas supply
2. Hold regulator control valve in the PILOT
position for 3 to 4 minutes to purge air
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 regulator valve (see Accessories
& Replacement Parts, page 14)
1. Check wiring connections. Refer to wir-
ing diagram shown in Wall Switch In-
stallation, page 6
2. Have a qualified technician replace valve
1. Check electrical connections
2. See Pilot will not stay lit, above
1. Clean and adjust pilot flame for maximum
flame impingement on pilot generator
1. Replace thermopile
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.
