Troubleshooting

Millivolt system

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

 

 

2.

valve is OFF

2.

supply

 

Air in gas line

Hold regulator control valve in

 

 

 

 

PILOT position for 2-3 minutes

 

 

 

 

to purge air. If you smell gas

 

 

 

 

stop and wait a few minutes

 

3.

Construction debris clog-

3.

before trying to light fireplace

 

Remove debris and dirt, in-

 

 

ging pilot orifice

 

spect and clean any other

 

4.

Low gas pressure

4.

possible obstructions

 

Contact your gas supplier

 

5.

Control valve knob is not on

5.

Turn control knob to pilot

 

6.

the PILOT position

6.

Have a qualified technician

 

Kinked pilot line

 

7.

Bad control valve

7.

replace pilot line

 

Have a qualified technician

 

 

 

 

replace valve

 

Pilot will not stay lit

1. Loose wiring on thermopile to

1.

Check wiring connections (see

 

 

regulator. No millivolt current

 

Wiring Diagrams, page 15)

 

2.

being sent back to regulator

2.

Have a qualified technician

 

If valve knob and wall switch

 

 

are in the ON position, prob-

 

replace valve

 

 

able defective control valve

 

 

 

No gas to burner, although wall

1. Wall switch wires defective

1.

Check electrical connections

switch and valve are set to the

2. Thermopile or sensor not

2.

and wires for continuity

ON position

See Pilot will not stay lit,

 

 

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

 

 

 

 

 

Pilot goes out when wall switch

1. Millivolt output on thermo-

1.

Have a qualified technician

is ON

 

pile too high

 

replace thermopile

 

Spark ignitor will not light pilot

1. Defective ignitor (no spark at

1.

Check for spark at electrode

after repeated triggering of red

 

electrode)

 

and pilot. If no spark and

button

 

 

 

electrode wire is properly

 

2.

Defective pilot or misaligned

2.

connected, replace ignitor

 

Check gap at electrode and

 

 

electrode at pilot (spark at

 

pilot. Gap should be 1/8" for

 

 

electrode)

 

strong spark. If gap is correct

 

3.

Low line pressure

3.

but no spark, replace pilot

 

Contact your local NG or LP

 

4.

No propane/LP gas in tank

4.

gas supplier

 

Refill supply tank (propane/LP

 

 

(Propane/LP units only)

 

only)

16

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Desa GL36CRP, GL36CLP installation manual Troubleshooting, Millivolt system, Observed Problem Possible Cause Remedy

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