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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
Exhaust fan comes on than shuts off Burner limit sensor not sensing flame Check to be sure all burners lighting, if yes replace sensor.
  Too much back pressure in exhaust venting Check for blockage in exhaust venting or maximum length per installation instructions.
  Combustion air pressure switch faulty. Tie together the brown and red wires coming off pressure switch. If the unit works then the pressure switch is bad.
  Gas supply missing or shut off Be sure your gas supply is available.
LED light not on Incorrect connection of thermostat to board Use the W and the R terminals for hooking up a thermostat rated for 24 volts AC. Check for this 24 volts at terminals R and C. If missing replace transformer # 60025
  No power. Be sure you have 110VAC to heater.
  Power OK Bad circuit board, replace
Blower Fan runs but no heat Wrong connection of thermostat
The connection on the terminal strip marked G is for blower only use the W and R terminals
  Circuit board damaged Replace
Blower and exhaust motors running but no heat One or all of the limit sensors activated Check each one individually and reset or replace bad one
  Circuit board damaged Replace
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