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12434-3-0903Page 12
1. Lit match goes out as it enters lighter port.
a. Certain wind conditions will blow out match. Ignite
match, and as it flares, thrust match through opening.
b. Open nearby door or window and relight pilot.
2. Pilot flames but goes out when knob is released.
a. See Lighting Instructions. Relight Pilot.
b. Relight the pilot and hold knob down longer and harder.
Close lighter hole cover just after igniting. Check for a
good pilot flame.
c. Defective thermopile or defective magnet in safety section
of valve. Replace.
3. Yellow pilot flame
a. Obstruction at pilot orifice.
b. Clean pilot orifice.
4. Pilot and main burner go out during normal operation.
a. Check millivolts.
b. Check for proper size of pilot flame.
c. Check for defective or weak thermopile.
d. Check input, reduce as needed.
e. Cover on pilot lighter hole must be air tight.
f. Check for tight fit of air and flue tubes at both ends of vent
assembly. No obstruction around vent that would prevent
the wind from hitting all of the vent equally.
5. Thermostat does not turn the main burner on.
a. Check wiring.
b. Check all millivolt readings.
c. Check for spider in main burner orifice.
6. Yellow main burner flame soot on the vent cap.
a. See Page 11, "Primary Air Adjustment".
b. Remove main burner to check for obstructions in throat and
ports.
c. Install new main burner orifice and pilot orifice. Refer to
Parts List, page 13.
7. On Propane gas, if a whistling noise (resonation) occurs.
a. See Page 11, "Primary Air Adjustment".
b. Reduce manifold pressure.
c. Size main burner orifice with a drill bit. For DV-25 use #54
drill bit. For DV-35 use #50 drill bit.
TROUBLESHOOTING
MAINTENANCE
Removing Main Burner
1. Disconnect the thermopile and pilot supply line at the pilot
burner.
2. Remove the burner compartment cover.
3. Remove orifice shield.
4. Remove bolt on each side of burner and lift out.
Cleaning Main Burner
The main burner may be cleaned by forcing water into the ports
and the throat of the burner. The main burner should be blown dry
or heated to remove water from main burner.
Removing Main Burner Orifice
1. Open the brass union located after the gas valve.
2. Loosen valve bracket.
3. Remove the 3/8" (10mm)manifold pipe that is attached to the
union elbow until the manifold pipe is free.
4. The main burner orifice is at the end of the manifold pipe.
Removing Pilot Orifice
1. Disconnect the pilot supply line at the pilot burner.
2. Remove pilot orifice from pilot burner. It may be necessary to
tap on pilot burner in order to remove the pilot orifice.
Cleaning Pilot Orifice
After use, cleaning of the pilot burner may be required for the
proper flame. Also, cleaning of the pilot burner may be required
due to spiders (spider webs). The pilot orifice can be cleaned with
high pressure air or by placing under running water. Pilot orifice
must be dry before replacement. Use a pipe cleaner to clean inside
the pilot after the pilot orifice has been removed.
Cleaning Combustion Chamber
When the main burner and vent cap are removed, all internal areas
of the combustion chamber are accessible for cleaning with a
vacuum hose.