Desa (V) CB36(N - Manual (Page 22)

21
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TROUBLESHOOTING
TROUBLESHOOTING
Manual Ignition System
Note: For additional help, visit
DESA’s technical service web site at
www. desatech.com
Note: All troubleshooting items are listed in
order of operation.
WARNING: Turn off heater and
let cool before servicing. Only a quali-
fi ed service person should service
and repair heater.
CAUTION Never use a wire,
needle, or similar object to
clean pilot. This can damage
pilot unit.
OBSERVED PROBLEM POSSIBLE CAUSE REMEDY
When ignitor button is pressed, there is no
spark at pilot
When ignitor button is pressed, there is
spark at pilot but no ignition
Pilot lights but fl ame goes out when control
knob is released
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
1. Gas supply turned off or equipment
shutoff valve closed
2. Gas control knob not in PILOT position
3. Gas control knob not pressed in while
in PILOT position
4. Air in gas lines when installed
5. Depleted gas supply (propane/LP models
only)
6. Pilot is clogged
7. Gas regulator setting is not correct
1. Gas control knob not fully pressed in
2. Gas control knob not pressed in long
enough
3. Equipment shutoff valve not fully open
4. Pilot fl ame not touching thermocouple,
which alows thermocouple to cool,
causing pilot to go out. This prob-
lem could be caused by one or more of
the following:
A) Low gas pressure
B) Dirty or partially clogged pilot
5. Thermocouple connection loose at con-
trol
valve.
6. Thermocouple damaged
7. Control valve damaged
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
1. Turn on gas supply or open equipment
shutoff
valve
2. Turn gas control knob to PILOT position
3. Press in gas control knob while in PILOT
position
4. Continue holding down control knob.
5. Contact local propane/LP gas company
6. Clean pilot (see Cleaning and Mainte-
nance, page 20) or replace pilot assembly
7. Replace gas control
1. Press in gas control knob fully
2. After pilot lights, keep gas control knob
pressed in 30 seconds
3. Fully open equipment shutoff valve
4. A) Contact local natural or propane/LP
gas
company
B) Clean pilot (see Cleaning and
Maintenance, page 20) or replace pi-
lot
assembly
5. Hand tighten until snug, then tighten
1/4 turn more
6. Replace pilot assembly
7. Replace control valve
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 fi lter
Manual Ignition System