Mr. Heater MHT 45 User Manual download pdf (Page 21)

Operating Instructions and Owner’s ManualMr. Heater | Gas-Fired Low-Intensity Infrared Heater

BURNER DOES NOT LIGHT

Possible Cause

Air in the gas line.

Improper gas inlet pressure.

Gas valve does not open.

Low gas outlet pressure.

BURNER DOES NOT STAY LIT

Possible Cause

Damaged wires between DSI module and electrode.

Faulty DSI module

Damaged Electrode

Try This….

Purge gas lines.

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.

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.

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 veried before performing outlet

pressure testing.

Try this…..

Replace wires as required.

Replace DSI module.

Replace Electrode

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Mr. Heater MHT 45 User Manual Page 21