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Mr Heater ignition constantly on. Circuit breaker trips.

HiI have a MR Heater mk75kt The unit turns on and functions but the ignitor stays on all the time. It sometimes causes the circuit breaker to trip. I am trying to figure out if it is the circuit board or the Ignition transformer. Thank you

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I s this spark ignition ? if so check out the igniter see if it is cracked ,it should send a signal back to the box and the stop sparking

Posted on Dec 17, 2016


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It sounds like the ignitor is not working, Since the heater is not detecting a flame it goes to lockout. Check the ignitor wiring to see if it is in good shape. Sometimes the connection where the wire (from the IID) connects to the ignitor gets corroded.

It could also be the IID which makes sure the safety loop is complete before calling for heat and sending current to the ignitor. Good luck with it.

Jan 11, 2014 | Mr. Heater Natural Gas Garage Heater -...

1 Answer

Main burners in my old utility gas heater will not ignite

A common problem with these are the safety limit switch trips, either because the fan did not come on and over heated the unit, or the unit got shut off while in heat mode, causing the switch to trip. These are usually located around the top/side of the unit heater behind a small access panel. It should be resettable by pushing in the small button in between the two connections. Hope this helps!

Dec 07, 2013 | Mr. Heater MHU45NG

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Why is my Jandy Lite 2 Pool Heater Tripping the Circuit Breaker

shorted ignitor remove the ignitor leads and see if it still trips if it doesnt trip replace the ignitor

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Mr heater 75000 btu thermostate turned up exhaust air turns on and ignitor doesnt ignite and times out

Probably your ignitor is bad...

Here is a tip that will help you try to figure out why your furnace is not working.

Basic Furnace or Heating System Troubleshooting


Feb 23, 2011 | Mr. Heater Natural Gas Garage Heater -...

2 Answers

Hi there, I have a Mr. Heater MH24T heater and the problem I am having is when I run one or both sides of the heater the plenum glows red and only the top of the screen is lit and it makes a fluttering...

Hello campcurti81,

Mr. Heater expends about 50% of it's instruction
MANUAL stating & re-repeating the MH24T (your)
is not suited for heating enclosed spaces...

And yet...
Here you are reporting that it is our sole reason
for being here is because it is your "MEANS" of
not staying cold in the winter weather...

Other than being in need of constant supervision &
quite hazardous... these heaters are fairly simple:

The screens need to be replaced when the infrared
element fails (on AMAZON... $19.48)
Amazon com Mr Heater Grid Screen Kit for Tank Top Heaters Home Kitchen

Also cheaper at eREPLACEMENT ($14.36 ++ tax/ship'n)
Mr Heater HVAC Parts Great Selection Great Prices eReplacementParts com

And (do not over-tighten) those
THERMOCOUPLES if the flame won't stay on after
the ignition count (eBay $6.99 + tax... FREE shipping)
Mr Heater Thermocouple for MH12 MH12C MH12T MH12CS MH12TS MH24T MH24TS...

Hope this helps (be safe: read + heed those warnings)

Carnac the Magnificent

Dec 23, 2017 | Mr. Heater MH24T 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

As you can see the unit only pulls 3 amps.

Hope this helps

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

1 Answer


Your house wiring in not capable of powering the unit. Try a different location to plug in. Check the unit to make sure it is not faulty and will trip breakers because it is damaged.

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Mr. Heater Buddy Portable Problems...

ok, your unit must be propane. look on the back where the propane line feeds the nozzle. there should be a very small copper line with two spade connectors on it. this is your millivolt generator line. with a flame at the nozzle the generator makes a very small electrical current which feeds to the main valve and keeps it open. take a piece of wire and jumper these two spade connections together and try lighting the unit again. if it stays on, the hi limit is shot. you can get by with the connections jumped out, you just don't have the safety margin if it were connected. IF with the spade connections jumped out the unit still shuts off, the generator tube needs to be changed.

Dec 25, 2007 | Mr. Heater Mr Heater Portable Buddy...

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