Cleaning and

Maintenance

Continued

venting system

Conduct annual inspection of the venting system following these guidelines:

1.Check areas of venting system that are ex- posed to the weather for corrosion (rust spots or streaks and, in extreme cases, holes). Have these items replaced immediately by a quali- fied service person.

2.Remove the vent cap and shine a flashlight into the vent. Remove any foreign material.

3.Check for evidence of excessive condensation. 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 loosened. Check mechani- cal supports such as wall straps for rigidity.

Troubleshooting

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

POSSIBLE CAUSE

REMEDY

 

 

 

 

 

Ignitor will not spark or pilot

1. No gas supply or shutoff

1.

Check to see if you have gas

will not light

 

valve is OFF

 

supply and that equipment

 

2.

Air in gas line

2.

shutoff valve is opened

 

Repeat lighting procedure

 

 

 

 

several times to purge all air

 

 

 

 

out of lines. If after repeated

 

 

 

 

attempts appliance does not

 

 

 

 

light, call for qualified service

 

3.

Construction debris clogging

3.

and repair

 

Remove debris and dirt, in-

 

 

pilot orifice

 

spect and clean any other

 

4.

Low gas pressure

4.

possible obstructions

 

Contact your gas supplier to

 

5.

Kinked pilot line

5.

check pressure

 

Have a qualified technician

 

6.

Control valve is not opening

6.

replace pilot line

 

Replace control valve (Refer to

 

7.

No power to unit or the igni-

7.

Replacement Parts, page 34)

 

Check that main power is

 

 

tion module or power trans-

 

on and that all wire connec-

 

 

former is bad

 

tions are made correctly to

 

 

 

 

the ignition model (see Wiring

 

 

 

 

Diagram, page 27). Check for

 

 

 

 

24 VAC at the secondary side

 

 

 

 

of the transformer. If 24 VAC

 

 

 

 

is present and the module does

not operate, have the module replaced otherwise have the transformer replaced

116235-01G

www.desatech.com

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Desa (V)VC36PE SERIES, (V)VC36NE SERIES Troubleshooting, Venting system, Observed Problem Possible Cause Remedy