Troubleshooting - Desa VC36NE Series Owner's Operation And Installation Manual

VENTING SYSTEM
Conduct annual inspection of the venting
system following these guidelines:
1. Check areas of venting system that are
exposed to the weather for corrosion (rust
spots or streaks and, in extreme cases,
holes). Have these items replaced im-
mediately by a qualified service person.
2. Remove the vent cap and shine a flash-
light into the vent. Remove any foreign
material.
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
pilot. This can damage pilot unit.
Note: Before troubleshooting the system, make sure the gas shutoff valve is ON.
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 filter
OBSERVED PROBLEM
Ignitor will not spark or pilot
will not light
116235-01K
CLEANING AND MAINTENANCE

TROUbLEShOOTING

pOSSIBLE CAUSE
1. No gas supply or shutoff
valve is OFF
2. Air in gas line
3. Construction debris clog-
ging pilot orifice
4. Low gas pressure
5. Kinked pilot line
6. C o n t r o l v a l v e i s n o t
opening
7. No power to unit or ignition
module or power trans-
former is bad
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Continued
3. Check for evidence of excessive con-
densation. Continuous condensation can
cause corrosion of caps, pipes and fittings
and can be caused by having excessive
lateral runs, too many elbows or exterior
portions of the system being exposed to
cold weather.
4. Inspect joints to verify that no pipe section
or fitting has been disturbed and loos-
ened. Check mechanical supports such
as wall straps for rigidity.
REMEDY
1. Check to see if you have gas
supply and that equipment
shutoff valve is opened
2. Repeat lighting procedure
several times to purge all air
out of lines. If after repeated
attempts appliance does
not light, call for qualified
service and repair
3. Remove debris and dirt,
inspect and clean any other
possible obstructions
4. Contact your gas supplier to
check pressure
5. Have a qualified technician
replace pilot line
6. Replace control valve (Re-
fer to Replacement Parts,
page 34)
7. Check that main power is
on and that all wire connec-
tions are made correctly to
ignition model (see Wiring
Diagram, page 27). Check
for 24 VAC at secondary
side of transformer. If 24
VAC is present and module
does not operate, have
module replaced otherwise
have transformer replaced
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