®

MDVFST DIRECT-VENT GAS FIREPLACE

TROUBLESHOOTING

Continued

OBSERVED PROBLEM

POSSIBLE CAUSE

REMEDY

When ignitor button is pressed, there is

1.

Gas supply turned off or equipment

1.

Turn on gas supply or open equipment

spark at pilot but no ignition

 

shutoff valve closed

 

shutoff valve

 

2.

Control knob not in PILOT position

2.

Turn control knob to PILOT position

 

3.

Control knob not pressed in while in

3.

Press in control knob while in PILOT

 

 

PILOT position

 

position

 

4.

Air in gas lines when installed

4.

Continue holding down control knob.

 

 

 

 

Repeat igniting operation until air is

 

 

 

 

removed

 

5.

Depleted gas supply (propane/LP

5.

Contact local propane/LP gas company

 

 

models only)

 

 

 

6.

Pilot is clogged

6.

Clean pilot or replace pilot assembly

 

7.

Gas regulator setting is not correct

7.

Replace gas control

 

 

 

 

 

Pilot lights but flame goes out when control

1.

Control knob not fully pressed in

1.

Press in control knob fully

knob is released

2.

Control knob not pressed in long enough

2.

After pilot lights, keep control knob

 

 

 

 

pressed in 30 seconds

 

3.

Equipment shutoff valve not fully open

3.

Fully open equipment shutoff valve

 

4.

Pilot flame not touching thermocouple,

4.

A) Contact local gas company

 

 

which allows thermocouple to cool,

 

 

 

 

causing pilot flame to go out. This prob-

 

B) Clean pilot or replace pilot assembly

 

 

lem could be caused by one or both of

 

 

 

 

the following:

 

 

 

 

A) Low gas pressure

 

 

 

 

B) Dirty or partially clogged pilot

 

 

 

5.

Thermocouple connection loose at con-

5.

Hand tighten until snug, then tighten

 

 

trol valve

 

1/4 turn more

 

6.

Thermocouple damaged

6.

Replace thermocouple

 

7.

Control valve damaged

7.

Replace control valve

 

 

 

 

 

Burner does not light after pilot is lit

1.

Burner orifice clogged

1.

Clean burner or replace burner orifice

 

2.

Inlet gas pressure is too low

2.

Contact local propane/LP or natural gas

 

 

 

 

company

 

3.

Thermopile leads disconnected or im-

3.

Reconnect leads

 

 

properly connected

 

 

 

4.

Thermopile is defective

4.

Replace thermopile

 

 

 

 

 

Delayed ignition burner

1.

Manifold pressure is too low

1.

Contact local propane/LP or natural gas

 

 

 

 

company

 

2.

Burner porting or orifice clogged

2.

Clean burner or replace burner orifice

 

 

 

 

 

Burner backfiring during combustion

1.

Burner orifice is clogged or damaged

1.

Clean burner or replace burner orifice

 

2.

Damaged burner

2.

Replace damaged burner

 

3.

Gas regulator defective

3.

Replace gas control

 

 

 

 

 

Slight smoke or odor during initial operation

1.

Residues from manufacturing processes

1.

Problem will stop after a few hours of

 

 

and logs curing

 

operation

 

 

 

 

 

Fireplace produces a whistling noise when

1.

Air in gas line

1.

Operate burner until air is removed from

burner is lit

 

 

 

line. Have gas line checked by local pro-

 

 

 

 

pane/LP gas company

 

2.

Dirty or partially clogged burner orifice

2.

Clean burner or replace burner orifice

www.desatech.com

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Desa MDVFST installation manual After pilot lights, keep control knob

MDVFST specifications

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