Mr. Heater MH4GC Operating Instructions And Owner's Manual page 5

NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING! NEVER LEAVE THE HEATER UNATTENDED WHILE BURNING!
SYMPTOM
• Spark electrode does not produce spark.
CAUSE
1. Spark electrode broken.
2. Igniter wire may not be attached to spark electrode.
3. Igniter wire damaged.
4. Piezo igniter is defective.
SYMPTOM
• Spark electrode produces spark but pilot does not light.
CAUSE
1. No gas to heater.
2. Pilot is blocked with foreign debris.
SYMPTOM
• Pilot flame does not stay lit when knob is released.
CAUSE
1. Improper pilot lighting.
2. Pilot flame not surrounding thermocouple.
3. Pilot Assembly is defective.
4. Tip switch wires are disconnected.
SYMPTOM
• Main burner does not ignite.
CAUSE
1. Main burner orfice is blocked.
SYMPTOM
• Heater keeps shutting "OFF" during normal operation.
CAUSE
1. Pilot is blocked.
3. Tip over switch activated from bumping heater.
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REMEDY
1. Replace ODS (Oxygen Depletion Sensor).
2. Attach igniter wire.
3. Replace igniter wire.
4. Replace gas valve assembly.
REMEDY
1. Connect hose to heater and turn on valve at remote
cylinder.
2. Clean pilot. See MAINTENANCE section.
REMEDY
1. Make sure that the control knob is completely depressed
in the "PILOT" position and held long enough to purge
air from lines and to heat up thermocouple once the pilot
flame appears.
2. Clean pilot, see MAINTENANCE.
3. Replace Pilot Assembly.
4. Connect tip switch wires. (check off switch and off switch
wiring).
REMEDY
1. Clean burner - see Maintenance.
REMEDY
1. Clean pilot. See MAINTENANCE section.
3. Re-light.
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Operating Instructions and Owner's Manual