Vanguard Heating VN18A - Manual (Page 20)

www.desatech.com 113052-01A 20
TROUBLESHOOTING
Note: All troubleshooting items are listed in order of operation.
WARNING: Turn off and unplug heater and let cool before servic-
ing. Only a qualified service person should service and repair heater.
CAUTION: Never use a wire, needle, or similar object to clean
ODS/pilot. This can damage ODS/pilot unit.
POSSIBLE CAUSE
1. Ignitor electrode positioned
wrong
2. Ignitor electrode broken
3. Ignitor electrode not con-
nected to ignitor cable
4. Ignitor cable pinched or wet
5. Broken ignitor cable
6. Bad ignitor
7. Battery not installed, battery
power low, or battery not in-
stalled correctly (electronic ig-
nition models only)
1. Gas supply turned off or equip-
ment shutoff valve closed
2. Control knob not fully pressed
in while pressing ignitor but-
ton (non-thermostat models
only)
Thermostat control knob not
fully pressed in while pressing
ignitor button (thermostat
models only)
3. Air in gas lines when installed
4. Depleted gas supply (propane/
LP gas)
5. ODS/pilot is clogged
6. Gas regulator setting is not
correct
7. Thermostat control knob is not
in pilot position (thermostat
models only)
REMEDY
1. Replace pilot assembly
2. Replace pilot assembly
3. Reconnect ignitor cable
4. Free ignitor cable if pinched
by any metal or tubing. Keep
ignitor cable dry
5. Replace ignitor cable
6. Replace ignitor
7. Install new alkaline battery in
electronic ignitor. Verify bat-
tery is installed correctly
1. Turn on gas supply or open
equipment shutoff valve
2. Turn to PILOT/IGN position.
Fully press in control knob
while pressing ignitor button
(non-thermostat models only)
Fully press in thermostat con-
trol knob while pressing igni-
tor button (thermostat models
only)
3. Continue holding down con-
trol knob. Repeat igniting op-
eration until air is removed
4. Contact local propane/LP gas
company
5. Clean ODS/pilot (see Cleaning
and Maintenance, page 19) or
replace ODS/pilot assembly
6. Replace gas regulator
7. Turn thermostat control knob
to pilot position
OBSERVED PROBLEM
When ignitor button is pressed
in, there is no spark at ODS/
pilot
When ignitor button is pressed
in, there is a spark at ODS/Pilot
but no ignition