Troubleshooting - Vanguard VN1800TB Owner's Operation And Installation Manual

INFRARED NATURAL GAS HEATER

TROUBLESHOOTING

Note: For additional help, visit DESA
International's technical service web site
at www.desatech.com.
Note: All troubleshooting items are listed in
order of operation.
OBSERVED PROBLEM
When ignitor button is pressed in, there is no
spark at ODS/pilot
ODS/pilot lights but flame goes out when
control knob is released
®
WARNING: Turn off and un-
plug heater and let cool before
servicing. Only a qualified ser-
vice person should service and
repair heater.
POSSIBLE CAUSE
1. Ignitor electrode positioned wrong
2. Ignitor electrode broken
3. Ignitor electrode not connected to igni-
tor cable
4. Ignitor cable pinched or wet
5. Broken ignitor cable
6. Bad piezo ignitor
7. Piezo ignitor nut is loose
1. Gas supply turned off or equipment
shutoff valve closed
2. Control knob not fully pressed in while
pressing ignitor button (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. ODS/pilot is clogged
5. Gas regulator setting is not correct
6. Thermostat control knob not in pilot
position
www.desatech.com
14
CAUTION: Never use a wire,
needle, or similar object to clean
ODS/pilot. This can damage ODS/
pilot unit.
REMEDY
1. Replace ignitor
2. Replace ignitor
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 control valve (piezo is part of
control valve)
7. Tighten nut holding piezo ignitor. Nut
is located inside heater cabinet at top
1. Turn on gas supply or open equipment
shutoff valve
2. Fully press in control knob while press-
ing ignitor button (non-thermostat mod-
els only)
Fully press in thermostat control knob
while pressing ignitor button (thermo-
stat models only)
3. Continue holding down control knob.
Repeat igniting operation until air is re-
moved
4. Clean ODS/pilot (see Cleaning and
Maintenance, page 13 ) or replace ODS/
pilot assembly
5. Replace gas regulator
6. Turn thermostat control knob to pilot
position
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