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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 Observed Possible Cause Solution
Pilot won't light
Note: Heater operates at reduced efficiency below 40 degrees F. (5 deg. C)
No flame. Tank valve is closed. Open valve.
    Blockage in orifice or pilot tube. Clean or replace orifice or pilot tube.
    Air in gas line. Open gas line and bleed it (pressing control knob in) for not more than 1-2 minutes or until you smell gas.
    Low gas pressure with tank valve fully open. Turn tank valve OFF and replace tank.
    Igniter fails. Use match to light pilot; obtain new igniter and replace.
Pilot won't stay lit Flame goes out Dirt built up around pilot. Clean dirt from around pilot.
    Connection between gas valve and pilot assembly is loose. Tighten connection and perform leak check.
    Thermocouple is not operating correctly. Replace thermocouple.
Burner won't light No heat. Gas pressure is low. Turn tank valve OFF and replace tank.
    Blockage in orifice . Clear blockage.
    Control knob is not in ON position. Check burner and orifices for blockage.
Burner flame is low Low heat. Gas pressure is low. Turn tank valve OFF and replace tank.
    Outdoor temperature is less than 40 deg. F and tank is less than 1/4 full. Use a full tank.
    Supply hose is bent or kinked. Straighten hose.
    Control knob fully ON. Check burner and orifices for blockage.
    Base is not on a level surface. Place heater on a level surface.
    Heater is level. Clean burner.
Thick black smoke Uneven glow Blockage in burner. Remove blockage and clean burner inside and outside.
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