Desa DVF36TCR - Manual (Page 29)

www.desatech.com 112108-01C 29
TROUbLESHOOTING
WARNING: Turn off heater, disconnect power if applicable 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.
Note: The two most common causes of malfunctioning gas appliances are loose wiring connections
and construction debris clogging pilot and/or control valve filter.
Note:
Before troubleshooting the system make sure gas shut off valve is open.
MILLIVOLT SYSTEM
REMEDY
1. Check 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 a few
minutes before trying to light
fireplace
3. Remove debris and dirt, in-
spect and clean any other
possible obstructions
4. Contact your gas supplier
5. Refer to section on pilot
lighting
6. Have a qualified technician
replace pilot line
7. Replace control valve
8. Tighten thermocouple or re-
place
1. Check wiring connection. Refer
to Wiring Diagrams, page 31
1. Check electrical connections
2. Re-check problem "Pilot Will
Not Stay Lit"
1. Clean and adjust pilot flame for
maximum flame impingement
on thermopile
1. Replace thermopile
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. Loose wiring on thermopile to
regulator valve. No millivolt
current being sent to regulator
1. Wall switch wires defective
2. Thermopile generator or sensor
not generating sufficient voltage
1. Pilot flame may be too low,
causing safety pilot to “drop
out”
1. Millivolt output on thermopile
too high
PROBLEM
Pilot will not light
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