Vanguard VMH26TNC - Manual (Page 24)

www.desatech.com 113111-01H 24
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WARNING: Turn off heater and let cool before servicing. 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.
Note: All troubleshooting items are listed in order of operation.
POSSIBLE CAUSE
1. Ignitor cable pinched or
wet
2. Ignitor electrode not con-
nected to ignitor cable
3. Broken ignitor cable
4. Bad piezo ignitor
5. Ignitor electrode broken
6. Ignitor electrode positioned
wrong
1. Gas supply turned off or
equipment shutoff valve
closed
2. Control knob not in PILOT
position
3. Control knob not pressed in
while in PILOT position
4. Air in gas lines when in-
stalled
5. Depleted gas supply (pro-
pane/LP only)
6. ODS/pilot is clogged
7. Gas regulator setting is not
correct
REMEDY
1. Free ignitor cable if pinched
by any metal or tubing.
Keep ignitor cable dry
2. Reconnect ignitor cable
3. Replace ignitor cable
4. Replace piezo ignitor
5. Replace pilot assembly
6. Replace pilot assembly
1. Turn on gas supply or open
equipment shutoff valve
2. Turn control knob to PILOT
position
3. Press in control knob while
in PILOT position
4. Continue holding down
control knob. Repeat ignit-
ing operation until air is
removed
5. Contact local propane/LP
gas company
6. Clean ODS/pilot (see
Cleaning and Maintenance,
page 23) or replace ODS/
pilot assembly
7. Replace gas regulator
OBSERVED PROBLEM
When ignitor button is
pressed, there is no spark
at ODS/pilot
When ignitor button is
pressed, there is spark at
ODS/pilot but no ignition