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

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

Posted on Dec 07, 2016

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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

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Maxx heater lights all burners for aprox 20 sec blower fan starts flame goes out flame lights again for 20 sec never blows much heat ?


sounds like its not getting gas fast enough to keep burning,that happen to me and the gas line was to long of a run for enough gas keep coming. so I up the pipe runs real good the flame keeps burning, so you know you can only go 25 ft in half inch pipe then u lose your flame

Oct 24, 2014 | Mr. Heater Natural Gas Garage Heater -...

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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

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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