26

TROUBLESHOOTING

TROUBLESHOOTING

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

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.

OBSERVED PROBLEM

POSSIBLE CAUSE

REMEDY

 

 

 

 

 

Ignitor will not spark or pilot will not light

1.

No gas supply or shutoff valve is OFF

1.

Check to see if you have gas supply and

 

 

 

 

that equipment shutoff valve is opened

 

2.

Air in gas line

2.

Repeat lighting procedure several times

 

 

 

 

to purge all air out of lines. If after re-

 

 

 

 

peated attempts appliance does not light,

 

 

 

 

call for qualified service and repair.

 

3.

Construction debris clogging pilot orifice

3.

Remove debris and dirt, inspect and

 

 

 

 

clean any other possible obstructions

 

4.

Low gas pressure

4.

Contact your gas supplier to check

 

 

 

 

pressure

 

5.

Kinked pilot line

5.

Have a qualified technician replace pilot

 

 

 

 

line

 

6.

Control valve is not opeining

6.

Replace control valve (Refer to Replace-

 

 

 

 

ment Parts, page 28)

 

7.

No power to unit or the ignition module

7.

Check that main power is on and that all

 

 

or power transformer is bad

 

wire connections are made correctly to

 

 

 

 

the ignition model (see Wiring Diagram,

 

 

 

 

page 23). 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 oth- erwise have the transformer replaced

Pilot will not stay lit

1.

Loose wiring on ignitor wire to ignition

 

 

module and/or poor ground to ignition

 

 

module

 

2.

Pilot flame too low to sense

1.Check wiring connection. Refer to wir- ing diagram (see Wiring Diagram, page 23) and/or check ground wire to ignition module

2.Clean and adjust pilot burner and check gas supply and inlet pressure to unit

Note: Have a qualified technician replace pilot assembly if broken or corroded

No gas to burner, although wall switch is

1.

Wall switch wires defective or too

1.

Check electrical connections

set to the ON position

 

long

 

 

 

 

 

 

 

Frequent pilot outage

1.

Pilot flame may be too low, causing

1.

Clean and adjust pilot flame for maximum

 

 

safety pilot to “drop out”

 

flame impingement on thermopile

 

2.

Improper venting or excessive blockage

2.

Have the vent system inspected, includ-

 

 

 

 

ing the termination cap. Remove any

 

 

 

 

restriction or obstruction

www.desatech.com

116235-01C

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Desa (V)VC36NE, (V)VC36PE installation manual Troubleshooting, Observed Problem Possible Cause Remedy
Page 25 Page 27

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