Monessen Hearth NB24, NB18 operating instructions Troubleshooting, ODS/pilot lights, but flame

Models: NB18 NB24

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ODS/pilot lights, but flame

TROUBLESHOOTING

WARNING

If the gas quality is bad, your pilot may not stay lit, the burners may produce soot and the heater may backfire when lit. If the gas quality or pressure is low, contact your local gas supplier immediately.

OBSERVED PROBLEM

POSSIBLE CAUSE

REMEDY

ODS/pilot lights, but flame

1.

Control knob not fully pressed in.

1.

Press in control knob fully.

goes out when control knob

 

 

 

 

2.

Control knob not pressed in long enough.

2.

After ODS/pilot lights, keep control knob

is released.

 

 

 

pressed in for 30 seconds.

 

 

 

 

 

3.

Manual shutoff valve not fully open.

3.

Fully open manual shutoff valve.

 

 

 

 

 

 

4.

Thermocouple connection loose at control

4.

Hand tighten thermocouple connection until

 

 

valve.

 

snug, then tighten 1/4 turn more.

 

 

 

 

 

 

5.

Pilot flame not touching thermocouple,

5.

Contact local gas company.

 

 

which allows thermocouple to cool, causing

 

 

 

 

pilot flame to go out. This problem could be

 

 

 

 

caused by either low gas pressure, or a dirty

 

 

 

 

or partially clogged ODS/pilot.

 

 

 

 

 

 

 

 

6.

Thermocouple damaged.

6.

Replace thermocouple.

 

7.

Control valve damaged.

7.

Replace control valve.

Burner does not light after

1.

Burner orifice is clogged.

1.

Burner orifice is clogged.

ODS/pilot is lit.

 

 

 

 

2.

Burner orifice diameter is too small.

2.

Burner orifice diameter is too small.

 

 

3.

Inlet gas pressure is too low.

3.

Inlet gas pressure is too low.

Burner backfires during

1.

Manifold pressure is too low.

1.

Contact local gas company.

combustion

 

 

 

 

2.

Burner orifice is clogged.

2.

Clean burner or replace burner orifice.

 

Slight smoke or odor during

1.

Burner orifice is clogged or damaged.

1.

Clean burner or replace burner orifice.

initial operation.

 

 

 

 

2.

Burner is damaged.

2.

Replace burner.

 

 

 

 

 

 

 

3.

Gas regulator defective.

3.

Replace gas regulator.

Logs appear to smoke after

1.

Vapors from paint or curing process of logs.

1.

Problem will stop after a few hours of

initial operation.

 

 

 

operation. Run the heater with the damper

 

 

 

 

open if you have one, or open a window for

 

 

 

 

the first few hours.

 

 

 

2.

Log heater is intended to be smokeless. Turn

 

 

 

 

OFF heater and call qualified service person.

Heater produces a whistling

1.

Turning control knob to HIGH position

1.

Turn control knob to LOW position and let

noise when burner is lit.

 

when burner is cold.

 

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 gas company.

 

3.

Dirty or partially clogged burner orifices.

3.

Clean burner or replace burner orifice.

No gas to pilot.

1.

LP-regulator shut down due to inlet pressure

1.

Verify LP tank regulator is installed and set at

 

 

too high.

 

11" to 13" w.c.

 

 

 

2.

Replace regulator on heater.

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Monessen Hearth NB24, NB18 operating instructions Troubleshooting, ODS/pilot lights, but flame