Mr. Heater MHT 45 owner manual Burner Does Not Light, Burner Does Not Stay Lit

BURNER DOES NOT LIGHT

Possible Cause	Try This….
Air in the gas line.	Purge gas lines.
Improper gas inlet pressure.	Check gas inlet pressure at the 1/8” NPT plugged tap. Gas inlet
	pressure should be as follows:
	Natural Gas: 5.0”w.c. min.; 10.5” max.
	LP Gas: 11”w.c. min.; 13.0” max.
	If gas inlet pressure does not meet inlet pressure requirements
	contact the gas company.
Gas valve does not open.	Check for 24V across valve terminals.
	Check Shutoff On Valve.
	IF NO: Check wiring between the ignition module and the valve.
	Repair/replace wires as required. If wiring is OK, replace ignition
	module. IF YES: Replace gas valve.
Low gas outlet pressure.	Check gas manifold pressure. Measure manifold pressure at the
	pressure tap on the gas valve.
	Check gas manifold pressure. Measure manifold pressure at the
	pressure tap on the gas valve. Natural Gas: 4.0” w.c. LP Gas: 10.0”
	w.c. If manifold pressure does not meet requirements, adjust valve
	outlet pressure with the adjustment screw on the valve. NOTE:
	Proper inlet gas pressure must be verified before performing outlet
	pressure testing.

BURNER DOES NOT STAY LIT

Possible Cause	Try this…..
Damaged wires between DSI module and electrode.	Replace wires as required.
Faulty DSI module	Replace DSI module.
Damaged Electrode	Replace Electrode

Mr. Heater Gas-Fired Low-Intensity Infrared Heater 21 Operating Instructions and Owner’s Manual