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Troubleshooting

The chart assumes that the proper gas and pressure is available to the heater. The chart also assumes that the heater is used in accordance with Mr. Heater installation and operating instructions.
Problem Possible Cause Solution
Piezo ignitor does not produce spark. Spark electrode positioned wrong. Adjust spark gap and/or replace pilot assembly.
  Igniter cable not connected to spark electrode. Connect cable to spark electrode.
  Spark electrode broken. Replace pilot assembly.
  Piezo igniter defective. Replace piezo igniter.
Piezo igniter produces spark at the electrode, but no pilot ignition. Gas supply turned off. Check that gas is connected properly. Open valve and purge air from hose if using remote tank.
     
  Control knob not depressed while in PILOT position. Depress control knob while in PILOT position and hold down for 3 to 6 seconds.
  Pilot tube is clogged. Clean pilot tube using q-tip with alcohol. Run 2” to bottom of pilot tube & twist around. Blow out.
  Regulator defective. Replace regulator.
Pilot lights but flame goes out immediately when control knob is released. Control knob not depressed long enough. After pilot is lit, keep control knob depressed for 30-60 seconds.
  Pilot flame not touching thermocouple. Clean pilot tube using q-tip with alcohol. Run 2” to bottom of pilot tube & twist around. Blow out.
  Thermocouple connection loose at control valve. Hand tight until snug, then 1/4 turn with wrench.
  Tip switch connections broken or disconnected. Clean electrical contact at control valve. Reconnect tip switch wires.
  Control knob is stripped. Remove knob and verify 2 flats that mate to control valve stem are not stripped. If stripped, replace knob.
  Defective thermocouple. Replace pilot assembly.
  Defective tip switch Replace tip switch.
  Defective control valve. Replace control valve.
Pilot lights but flame goes out gradually when control knob is released. Control knob not depressed long enough. After pilot is lit, keep control knob depressed for 30-60 seconds.
  Pilot flame not touching thermocouple. Clean pilot tube using q-tip with alcohol. Run 2” to bottom of pilot tube & twist around. Blow out.
  Thermocouple connection loose at control valve. Hand tight until snug, then 1/4 turn with wrench.
  Inlet gas pressure too low. Check/replace gas cylinder.
  Defective regulator. Replace regulator.
Burner does not light after pilot is lit. Main burner orifice is blocked/clogged. Remove burner assembly. Clean main burner orifice with clean cloth or q-tip with alcohol.
  Venturi tube is blocked. Remove burner assembly. Clean out venturi tube on back of burner with both a pipe cleaner and air pressure.
  Inlet gas pressure is too low. Check/replace gas cylinder.
  Control knob set between HI & LOW positions Turn control knob until it locks into desired setting.
  Control knob is stripped. Remove knob and verify 2 flats that mate to control valve stem are not stripped. If stripped, replace knob.
  Defective ceramic plate. Replace ceramic burner.
  Defective regulator. Replace regulator.
Heater shuts off during operation Not enough fresh air available Provide ventilation per owner's manual.
  Inlet gas pressure is too low. Check/replace gas cylinder.
  Pilot tube has become blocked/clogged. Clean pilot tube using q-tip with alcohol. Run 2” to bottom of pilot tube & twist around. Blow out.
  Tip switch has been activated due to bumping or moving. Level heater and re-light.
  Oil contamination due to improper shutdown. Complete disassembly & cleaning of fuel lines with soap & water. Replace control valve & regulator. Purge supply hose. See owner's manual for proper shutdown when using remote tank or use fuel filter F273699.
IF SERVICE IS REQUIRED
For information regarding service, please call our Toll-Free Number: 1-800-251-0001. Our office hours are 8:30 a.m. - 5:00 p.m., Eastern Time Zone, Monday through Friday. Please include the model number, date of purchase, and description of problem in all communication.
WARRANTY
Mr. Heater warrants Mr. Heaters and accessories to be free from defects in material and Workmanship for a period of 1 year from date of purchase. Mr. Heater will repair or replace this Product free of charge if it has been proven to be defective within the 1 year period, and is Returned at customer expense with proof of purchase to Mr. Heater within the warranty period.
IF SERVICE IS REQUIRED
For information regarding service, please call our Toll-Free Number: 1-800-251-0001. Our office hours are 8:30 a.m. - 5:00 p.m., Eastern Time Zone, Monday through Friday. Please include the model number, date of purchase, and description of problem in all communication.


TROUBLESHOOTING
Original Series Tank-Top Heaters
Big Buddy
Big Max
Portable Buddy
Convection Heaters
Forced Air Kerosene Heaters
Forced Air Propane Heaters
Garage / Shop Heaters
Patio Heaters
Radiant Portable Heater (Model MH35LP)
Radiant Portable Heater (Model MH125LP)
Tube Heaters