FIREPLACE MANUFACTURERS INCORPORATED

UNVENTED NATURAL GAS LOG HEATER

TROUBLESHOOTING

Continued

 

 

OBSERVED PROBLEM

POSSIBLE CAUSE

REMEDY

 

 

Burner does not light after ODS/pilot is lit

1.

Burner orifice clogged

1.

Clean burner (see Cleaning and Mainte-

 

 

 

 

 

 

nance, page 20) or replace burner orifice

 

 

 

2.

Inlet gas pressure is too low

2.

Contact local natural gas company

 

 

 

3.

Burner orifice diameter is too small

3.

Replace burner orifice

 

 

 

4.

Thermopile leads disconnected or im-

4.

Reconnect leads (see Wiring Diagram,

 

 

 

 

properly connected

 

page 21)

 

 

 

5.

Burners will not come on in remote po-

5.

Replace battery in transmitter and re-

 

 

 

 

sition

 

ceiver

 

 

 

 

 

 

 

 

 

 

Delayed ignition burner

1.

Manifold pressure is too low

1.

Contact local natural gas company

 

 

 

2.

Burner orifice clogged

2.

Clean burner (see Cleaning and Mainte-

 

 

 

 

 

 

nance, page 20) or replace burner orifice

 

 

 

 

 

 

 

 

 

 

Burner backfiring during combustion

1.

Burner orifice is clogged or damaged

1.

Clean burner (see Cleaning and Mainte-

 

 

 

 

 

 

nance, page 20) 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.

Not enough air

1.

Check burner for dirt and debris. If

 

 

 

 

 

 

found, clean burner (see Cleaning and

 

 

 

 

 

 

Maintenance, page 20)

 

 

 

2.

Gas regulator defective

2.

Replace gas control

 

 

 

3.

Residues from manufacturing processes

3.

Problem will stop after a few hours of

 

 

 

 

and logs curing

 

operation

 

 

 

 

 

 

 

 

 

 

Moisture/condensation noticed on windows

1.

Not enough combustion/ventilation air

1.

Refer to Air for Combustion and Venti-

 

 

 

 

 

 

lation requirements (page 4)

 

 

 

 

 

 

 

 

 

Heater produces a whistling noise when

1.

Turning control knob to HI position

1.

Turn control knob to LO position and

 

 

burner is lit

 

when burner is cold

 

let warm up for a minute

 

 

 

2.

Air in gas line

2.

Operate burner until air is removed from

 

 

 

 

 

 

line. Have gas line checked by local

 

 

 

 

 

 

natural gas company

 

 

 

3.

Air passageways on heater blocked

3.

Observe minimum installation clear-

 

 

 

 

 

 

ances (see pages 7 through 9)

 

 

 

4.

Dirty or partially clogged burner orifice

4.

Clean burner (see Cleaning and Mainte-

 

 

 

 

 

 

nance, page 20) or replace burner orifice

White powder residue forming within burner box or on adjacent walls or furniture

1.When heated, vapors from furniture pol- ish, wax, carpet cleaners, etc. turn into white powder residue

1.Turn heater off when using furniture polish, wax, carpet cleaners, or similar products

Remote does not function (FHRC and FHRCT only)

1.Battery is not installed. Battery power is low

1.Replace 9-volt batteries in receiver and remote control

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Desa FVFM27NR installation manual Observed Problem Possible Cause Remedy, Maintenance
Page 17 Page 19

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