Desa VM42P installation manual Troubleshooting, Observed Problem Possible Cause Remedy

Models: VM42P

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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

OBSERVED PROBLEM

POSSIBLE CAUSE

REMEDY

Pilot will not light

1. No gas supply or shutoff

1.

Check to see if you have gas

 

 

valve is OFF

 

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 minutes before trying to

 

 

 

 

light the fireplace

 

3.

Construction debris clog-

3.

Remove debris and dirt, in-

 

 

ging pilot orifice

 

spect and clean any other

 

4.

Low gas pressure

 

possible obstructions

 

4.

Contact your gas supplier

 

5.

Control valve knob is not on

5.

Refer to section on pilot

 

 

the PILOT position

 

lighting

 

6.

Kinked pilot line

6.

Have a qualified technician

 

7.

Bad valve

 

replace pilot line

 

7.

Replace regulator valve (see

 

8.

Vent damper not fully open

 

Accessories, page 31)

 

8.

Open vent damper until fully

 

 

 

 

locked in OPEN position

 

 

 

 

 

Pilot will not stay lit

1.

Loose wiring on thermopile

 

 

to regulator valve. No mil-

 

 

livolt current is being sent

 

 

back to regulator

 

2.

If valve knob and wall switch

 

 

are in the ON position, proba-

 

 

ble defective regulator valve

 

3.

Vent damper not fully open

1.Check wiring connections. Refer to wiring diagram shown in Wall Switch Instal- lation, page 11

2.Have a qualified technician replace valve

3.Open vent damper until fully locked in OPEN position

No gas to burner, although wall

1.

Wall switch wires defective or

1.

Check electrical connections

switch and valve are set to the

 

too long

2.

See Pilot will not stay lit,

ON position

2.

Thermopile not generating

 

 

sufficient voltage

 

above

 

 

 

 

 

Frequent pilot outage

1.

Pilot flame may be too

1.

Clean and adjust pilot flame

 

 

low, causing safety pilot to

 

for maximum flame impinge-

 

 

“drop out”

 

ment on thermopile

 

2.

Improper venting or excessive

2.

Have the vent system inspect-

 

 

blockage

 

ed, including the termination

 

 

 

 

cap. Remove any restriction

 

 

 

 

or obstruction

108795-01N

www.desatech.com

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Desa VM42P installation manual Troubleshooting, Observed Problem Possible Cause Remedy