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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
Blower does not come on Power cord or power not on. Plug in or turn on power.
  Thermostat setting is too low. Increase thermostat temperature setting.
  DSI module needs to be reset. Unplug heater power cord from the electrical outlet: wait for a minimum of five seconds. Plug heater cord back into outlet..
  Faulty blower motor. Replace blower motor.
Igniter does not spark DSI module needs to be reset. Unplug heater power cord from the electrical outlet: wait for a minimum of five seconds. Plug heater cord back into outlet.
  Faulty igniter or ignition wire. Unplug heater power cord, check igniter and ignition wire for damage. Replace parts as needed.
  Air switch does not operate. Check flue/air supply ducts for obstructions. Look for loose/leaky air hoses to air switch. Check for 24vac on terminals 4 and 5. If missing check for 120vac. If yes on 120vac replace transformer.
  Igniter spark gap incorrect. Reset spark gap to 1/8' (0.125”).
Burner does not stay lit Damaged wires between DSI module and electrode. Replace wires as required.
  Improper gas inlet pressure. Check gas inlet pressure per specs. In operators manual.
If satisfactory results cannot be obtained after performing any of the above procedures, please call Mr. Heater's Customer Care Center at 1-800-251-0001.

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