Monessen Hearth MJ27NR, MJ27PR operating instructions Goes out when control

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	2.	Control knob not pressed in long	2.	After ODS/pilot lights, keep control knob
knob is released.		enough.		pressed in for 30 seconds.
	3.	Manual shutoff valve not fully open.	3.	Fully open manual shutoff valve.
	4.	Thermocouple connection loose at	4.	Hand tighten thermocouple connection
		control valve.		until 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	1.	Burner orifice is clogged or damaged.	1.	Clean burner or replace burner orifice.
during initial operation.	2. Burner is damaged.		2.	Replace burner.
	3.	Gas regulator defective.	3.	Replace gas regulator.
Logs appear to smoke	1.	Vapors from paint or curing process of	1.	Problem will stop after a few hours of
after initial operation.		logs.		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.
H e a t e r p r o d u c e s a	1. Turning control knob to HIGH position		1.	Turn control knob to LOW position and let
whistling noise when		when burner is cold.		warm up for a minute.
burner is lit.	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	1.	Verify LP tank regulator is installed and
		pressure too high.		set at 11" to 13" w.c.
			2.	Replace regulator on heater.

34 86D0024