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I have a mr.heater 125000 btu i put many new parts on it and still will not work i replaced the start capacitor,flame control, igniter assy,igniter assy.

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6ya6ya
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Posted on Jan 02, 2017

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Buffalo12980
  • 625 Answers

SOURCE: MR. Heater Portable Buddy model MH9B

the mr heater series units have a millivolt generator connected to a very small sensitive electromagnet in the valve body. inside the generator is a small insulated wire connected to the very tip of the generator. that and the outside copper tube forms the j-k junction. at the other end, the part that goes into the valve is a silver button and a gland nut. this forms the other part of the electric circuit. the inside of the valve has a spring and an iron slug with a rubber pad. the slug gets sucked into the electromagnet when the magnet is operating and holds the pad off its seat allowing propane to go through the regulator and valve. change out your generator and I'm sure your problems will be solved. mr heater has a web site.

Posted on Nov 04, 2007

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  • 14 Answers

SOURCE: Mr Heater MH75KT - won't start with diesel

If the MH75KT is the correct model, then it is a Kerosene only heater. Fuels, like oil and diesel all have different ignition points.
http://www.mrheater.com/upload/newsletter/70276_MH_HS_50_75_125_175_210KT_REV%20A.pdf
See page 3 of the manual.

Posted on Feb 04, 2008

  • 1 Answer

SOURCE: Pool heater burners won't ignite.

Also you need to inspect the igniter.

Posted on Apr 25, 2009

  • 400 Answers

SOURCE: Dometic Duo-Therm - 13,500 B.T.U. Model #3107541.009 - Serial # WA346967 - Yr. 1999-2000. Blower motor will not start. Replaced the start capacitor - no help. It will run by spinning the motor by hand

Yes you should try replacing the run capacitor.

Posted on May 08, 2009

  • 1 Answer

SOURCE: propane shuts off after releasing start button.

I have the same problem with my Reddy heater 55-f. Is it thermal coupling or relay?

Posted on Dec 08, 2009

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No spark. My HSU75NG MR. Heater (Big Maxx) will not start on its own. It purges fine ,calls for heat fine, gas flows fine; BUT there is no spark from the Electrode Igniter. Which I have replaced. The


The capacitor in that unit is for starting the motor that drives the blower fan. It has no impact on the ignition of the gas burner. On the control board, there is a light that should be flashing, can you tell us how many times it is flashing?

Feb 18, 2014 | Mr. Heater Natural Gas Garage Heater -...

1 Answer

Ignition control failure


Try cleaning the flame sencor first , or it could be the snap dice shutting down there are two on there you could bridge them out one at atime and see if it stays on .

Nov 22, 2012 | Mr. Heater Natural Gas Garage Heater -...

1 Answer

Ignition flame erratic. 3 tries and then into lockout mode.


clean the flame sencor first then check wire from sencor is not loose .

Jump out pressure switch some times you can fool it in to working or try jumping out hi or low stats on heater (snap discs )

Sep 30, 2012 | Mr. Heater Natural Gas Garage Heater -...

1 Answer

I HAVE A PROPANE 75-125000 BTU REDDING HEATER. WHEN I RELEASE THE STARTER BUTTON THE FLAME GOES OUT. I TRIED HOLDING SEVERAL MINS AND IT STILL GOES OUT. HELP!!!


You will need to replace the pilot safety or commonly called Thermocouple. It is the probe located in the flame disc and works its way back to the gas valve. Remove it and take it to a good hardware store. You may have to purchase a longer one but you can keep it coiled to make it fit. Real easy to replace.

Jan 23, 2011 | Reddy Heater-30-55,000 BTU Variable

1 Answer

Mr. Heater Big Maxx 75,000 BTU Heater will not ignite. Manufacturer says it's possibly a faulty chipboard. After replacing the chipboard with a new unit shipped from the manufacturer the unit still will...


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).

Feb 26, 2010 | Mr. Heater Natural Gas Garage Heater -...

1 Answer

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

Intalled an overhead 130K BTU Mr. Heater last


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).

Dec 01, 2009 | Mr. Heater Heating & Cooling

1 Answer

Have a Mr. Heater 175000 BTU that is leaking at the bottom were the drain plug is located. The O-ring is cracked, I need a replacement for the O-ring. What size do I get?


Tip the heater up so that the fuel is away from the drain plug hole and take the plug to an auto parts store. They have bulk o-rings there and can fit the needed O'ring to your plug.

I checked the parts manual:

http://www.mrheater.com/upload/newsletter/mh_50_75_125_150_175_210_BL.pdf

There is no drain plug listed for the tank. Only the tank assy. (Item 2)

You might even be able to get a copper crush washer similar to what is used on an automobile or motorcycle oil drain plug.

Kelly

Sep 30, 2009 | Mr. Heater MH175KT Open Flame Utility

1 Answer

Have john deere 50 kerosene space heater has fuel,new plug,


if it trys to start when you turn the thermostate then thats not the problem, it has to be either the high heat limit control or the flame sensor. Mine did the same thing and I also thought the eye was working but as soon as I changed it the problem was solved. Pretty much all flame sensors are the same and you can get one from Mr. Heater for less than 3 bucks, same with the limit control.

Jan 23, 2009 | Reddy Heater-170,000 BTU Kerosene Deluxe

1 Answer

Cad flame sensor


go to Mr.heater.com and get a CAD flame sensor for any heater with the same btu output. They are all basically the same. The wires will be a different color so just splice them to you old wire harness, there is no wrong way to connect them. I just did the same thing with my dyna glo and it works perfectly. Most heater parts ar interchangeable they just have different wireing.

Jan 22, 2009 | Reddy Heater-30-55,000 BTU Variable

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