Mr. Heater Portable Buddy MH9BX User Manual (English)

Questions and Answers:

M
Melissa KellerJul 26, 2025
Why does my Mr. Heater Portable Buddy MH9BX keep shutting off?
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  Joshua MorrisJul 26, 2025
  Your Mr. Heater Gas Heater might be shutting off due to several reasons. The pilot could be blocked, so cleaning the pilot might help. The tip-over switch may have been activated if the heater was bumped, in which case you should try re-lighting it. Also, the regulator might be defective, requiring a replacement. In some cases, internal contamination might be the cause, necessitating the replacement of both the control valve and regulator.
C
Christopher HubbardAug 1, 2025
What to do if Mr. Heater Portable Buddy MH9BX Gas Heater spark is working but pilot won't light?
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  Crystal RamirezAug 2, 2025
  If the spark electrode in your Mr. Heater Gas Heater is producing a spark but the pilot light won't ignite, there could be a few reasons. First, ensure that there is gas supply to the heater by installing a disposable cylinder or connecting a hose and filter, and then turn on the valve at the remote cylinder. Also, check that the gas control knob is properly aligned to the “PILOT” position and fully depressed. Another possibility is that the pilot is blocked by a spider web or dirt. If so, it should be cleaned.
T
timothy68Aug 7, 2025
How to fix Mr. Heater Gas Heater if pilot light goes out after releasing the knob?
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  Marc CarrollAug 7, 2025
  If the pilot flame on your Mr. Heater Gas Heater doesn't stay lit after you release the knob, it could be due to a few reasons. Ensure that the control knob in the “PILOT” position is completely depressed and held long enough to purge air from the lines. Also, check that the pilot flame surrounds the thermocouple; if not, clean the pilot. A defective pilot assembly could also be the cause, requiring replacement. Finally, check if the tip switch wires are disconnected and connect them if necessary.
M
Melissa BrownAug 13, 2025
What to do if Mr. Heater Gas Heater main burner won't ignite?
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  phicksAug 13, 2025
  If the main burner of your Mr. Heater Gas Heater does not ignite, it could be due to a blocked main burner orifice. Try cleaning the burner.
J
Joseph MosesAug 19, 2025
How to troubleshoot Mr. Heater Gas Heater when spark electrode does not produce spark?
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  Michael RichardsAug 19, 2025
  If the spark electrode on your Mr. Heater Gas Heater isn't producing a spark, begin by checking the spark electrode itself; if it's defective, replace the ODS (Oxygen Depletion Sensor). Also, ensure the igniter wire is correctly attached to the spark electrode. Inspect the igniter wire for damage and replace it if necessary. Finally, check the piezo igniter; if it's defective, replace the control valve.

Mr. Heater Portable Buddy MH9BX Specifications

General

Heating Capacity	4, 000 - 9, 000 BTU/hr
Fuel Type	Propane
Ignition	Piezo Ignition
Weight	9 lbs
Safety Features	Oxygen Depletion Sensor (ODS), Automatic Shut-off if tipped over
Heating Area	Up to 225 square feet
Connection	1 lb cylinder or 20 lb cylinder with optional hose