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

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Mr heater big maxx led 3 blinks - Mr. Heater Natural Gas Garage Heater - 45,000 BTU

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: Mr. Heater 75000 but big maxx, it calls for heat

You have a bad ignition mudule.

Posted on Nov 01, 2009

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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

  • 2597 Answers

SOURCE: I'm looking for replacement parts

try national energy they are on line

Posted on Sep 08, 2010

  • 308 Answers

SOURCE: how big of a breaker

It looks like a 15 amp breaker would be fine, here is the spec sheet
http://shopfnc.com/pdffiles/mhu45spec.pdf

As you can see the unit only pulls 3 amps.

Hope this helps

Posted on Nov 17, 2010

heatman101
  • 43501 Answers

SOURCE: I have a new mr

Hi,
The problem is the nonregulated propane tank....you may have already damaged the gas valve...

The gas pressure coming into the gas valve can be no more then 13"WC or it will not open...
You will need to get a regulator installed in the line from the tank that will allow no more then 13" WC gas pressure to the gas valve...

heatman101

Posted on Jan 22, 2011

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1 Answer

Mr. heater big maxx keeps blowing fuses, Replaced everything in it and still does it. sometimes it will run for a while


Maybe its the wire or the outlet. Does the wire get hot? Try a different outlet that is on a larger amp breaker.

Dec 07, 2016 | Mr. Heater Heating & Cooling

1 Answer

Mr heater big maxx constantly blowing its 3 amp fuse.


Check 24 volt wiring That would be wiring from your thermostat to heater

Nov 21, 2016 | Heating & Cooling

1 Answer

I have a Big Maxx heater and it won't stop blowing and won't heat. The fan just keeps running! Anyone know what could be wrong?


Your pressure switch may not be activating (ie closing and making contacts) This means you could have a blocked flue, clogged pressure switch tube or a bad pressure switch. The pressure switch is a safety feature to ensure your exhaust is not blocked and operating correctly. Find owners manual. Look at trouble shooting section. Open cabinet and look for error code light. If blinking 3 times, try "jumping" the pressure switch. To jump pressure switch you need to clear code be turning off power. When the unit/thermostat calls for heat the power vent fan starts first, this is when you need to jump the pressure switch. You need to do this in sequence. That is the unit first starts the power vent exhaust thus activating the pressure switch allowing the ignition cycle to the burners and heat. So the power vent fan needs to start first BEFORE you put the jumper on to bypass the pressure switch. Once the jumper is on it will call for ignition after approx 30 seconds. If ignites your problem is one of the 3 stated at the opening of this paragraph

Mar 21, 2013 | Mr. Heater Natural Gas Garage Heater -...

1 Answer

How big of a breaker do i need to install for a 45000ng mr heater big maxx?


It looks like a 15 amp breaker would be fine, here is the spec sheet
http://shopfnc.com/pdffiles/mhu45spec.pdf

As you can see the unit only pulls 3 amps.

Hope this helps

Nov 14, 2010 | Mr. Heater Natural Gas Garage Heater -...

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