Question about Mr. Heater Natural Gas Garage Heater - 45,000 BTU

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My Mr. Heater has been working fine for 4 years. But now there is no spark. It Seem to do everything correct except fire the igniter. I cleaned it up with a small wire brush. Now it sparks, but not at the end of the electrodes about a inch in from the tips. IS this NORMAL? And it only sparks after I have used a BBQ lighter to fire it up. The GAP is tapered IS THIS NORMAL. I am going to replace the ignitor And I am looking for a parts supplier now. But mean while back on the ranch,Baby it cold outside. Any ideas?

Posted by Anonymous on

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Posted on Jan 02, 2017

steve_lima
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SOURCE: I'm looking for mr.heater model#mh9b parts parts

go to http://www.pinnacleint.com/

Posted on Mar 17, 2009

co7196
  • 3433 Answers

SOURCE: Can't get an outdoor propane heater to light.

turn off propan and heater. Undo the connector hose. then rehook hosewith heater valve off, Turn on propane valve real slow. Propane bottle valves have a safety that senses rapid escape, like in a wide open dump. This should reset it.Then light the pilot . should work.

Posted on Jun 10, 2009

  • 2461 Answers

SOURCE: i have a 75,000 btu mr heater and the spark

Hi clean the flame senser blow the dust out of the heater check the fan switch might be dusty jump out pressure switch see if that helps

Posted on Feb 02, 2010

Therinnaiguy
  • 1420 Answers

SOURCE: Mr. Heater Big Maxx 75,000 BTU Heater will not

Is the circuit board giving you a blinking error code?
On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Posted on Feb 26, 2010

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My mr. Heater contractor series 75,000 kerosene heater won't get hot the blower isn't kicking on its getting fire and it's got kerosene in it but it won't get hot the blower won't kick on?


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OK-- Let's go thru your trouble shooting steps, and what you found:

1.) Fuel: Sufficient, and right type?

2.) Has the unit fired and run before?-- What is different in sounds, or settings now?

3.) How does this unit ignite the fuel?-- With Spark, or with Glowing ignitor?
If Spark-- can you hear it sparking?

If Glowing ignitor, -- can you see the glowing? (in a darkened room..)

4.) Can you see that Kerosene is spraying at the nozzle?-- is the pattern correct?

5.) Have you check fuel and air pressure settings-- according to the manual?

After observing these details-- let us know what other clues you are observing now.

I'll be here to take you to the next step, if you like--- Just add your new comments in the 'respond' box-- they will send them to me for further follow-up.

Mack B

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I have a 75,000 btu mr heater and the spark ignition doesnt work . do i have a bad circuit board?


Hi clean the flame senser blow the dust out of the heater check the fan switch might be dusty jump out pressure switch see if that helps

Feb 02, 2010 | Mr. Heater Natural Gas Garage Heater -...

1 Answer

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1. Check the ignition transformer. It may be grounded,
or it could be defective, and need to be replaced.
2. You have already replace the igniter and the
photoeye.
3. Once the ignition transformer works, everything will
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May this tip help you.

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Can't get an outdoor propane heater to light.


turn off propan and heater. Undo the connector hose. then rehook hosewith heater valve off, Turn on propane valve real slow. Propane bottle valves have a safety that senses rapid escape, like in a wide open dump. This should reset it.Then light the pilot . should work.

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See page 3 of the manual.

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