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111921-01B
For more information, visit www.desatech.com
For more information, visit www.desatech.com
28
TROUBLESHOOTING
TROUBLESHOOTING
Note:
All troubleshooting items are listed in
order of operation.
WARNING: Turn off heater and
let cool before servicing. Only a quali-
fied service person should service
and repair heater.
CAUTION: Never use a wire,
needle, or similar object to
clean pilot. This can damage
pilot unit.
POSSIBLE CAUSE
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 flame not touching thermocouple,
which allows thermocouple to cool,
causing pilot flame to go out. This prob-
lem could be caused by one or both 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
REMEDY
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.
Repeat igniting operation until air is re-
moved
5. Contact local propane/LP gas company
6. Clean pilot (see Cleaning and Mainte-
nance, page 27) 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 27) or replace pi-
lot assembly
5. Hand tighten until snug, then tighten
1/4 turn more
6. Replace pilot assembly
7. Replace control valve
OBSERVED PROBLEM
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 flame goes out when control
knob is released
Note:
For additional help, visit DESA’s
technical service web site at
www.desatech.com.