TROUBLESHOOTING

21

TROUBLESHOOTING

Note: For additional help, visit DESA International’s Techni- cal Service web site at www.desatech.com.

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

Pilot will not light

1.

No gas supply, or shutoff valve is OFF

1.

Check to see if you have gas supply

 

2.

Air in gas line

2.

Hold regulator control valve in the PILOT

 

 

 

 

position for 2 to 3 minutes to purge air. If

 

 

 

 

you smell gas stop and wait for a few min-

 

 

 

 

utes before trying to light the fireplace

 

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

 

5.

Control valve knob is not on the PILOT

5.

Refer to section on pilot lighting

 

 

position

 

 

 

6.

Kinked pilot line

6.

Have a qualified technician replace pi-

 

 

 

 

lot line

 

7.

Bad valve

7.

Replace regulator valve (see Accesso-

 

 

 

 

ries, page 27)

 

8.

Vent damper not fully open

8.

Open vent damper until fully locked in

 

 

 

 

OPEN position

 

 

 

 

 

Pilot will not stay lit

1.

Loose wiring on thermopile to regula-

1.

Check wiring connections. Refer to wir-

 

 

tor valve. No millivolt current is being

 

ing diagram shown in Wall Switch In-

 

 

sent back to regulator

 

stallation, page 11

 

2.

If valve knob and wall switch are in the

2.

Have a qualified technician replace valve

 

 

ON position, probable defective regula-

 

 

 

 

tor valve

 

 

 

3.

Vent damper not fully open

3.

Open vent damper until fully locked in

 

 

 

 

OPEN position

 

 

 

 

 

No gas to burner, although wall switch and

1.

Wall switch wires defective or too long

1.

Check electrical connections

valve are set to the ON position

2.

Thermopile not generating sufficient

2.

See Pilot will not stay lit, above

 

 

voltage

 

 

 

 

 

 

 

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

For more information, visit www.desatech.com

108795-01E

Page 21
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Desa VM42, M36 installation manual Troubleshooting, Observed Problem Possible Cause Remedy

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