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

1 Answer

Mr heater big maxx 45000 btu

Hi ,jjust bought this heater mr heater big maxx 45000btu now, the led indicator works fine, calls for heat then the ignitor tries to ignite but no gas after the gas valve.... here's precisely what she does: 1: led blinking slowly (normal mode ) 2: turn up the thermostat, led calls up for heat and exhaust blower starts for about 30s 3:ignitor tries to light the burner then tries again and again 4: no smell of gas while doing this 5: i unplugged gas from the inlet side and there is gas going in the valvle but not trough the valve.... now my question is will she light up propane even if it is set up with ng? do i absolutely need a 24v thermostat to fire it up? i know the machine can go in shut down mode ,but how can you unlock it??? what could be all the causes and how to check? please some help quick would be much appreciated

Posted by on

  • acadieman Dec 06, 2012

    i finally found the problem, i absolutely needed a 24v thermostat to fire it up



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Mr. Heater Master
  • 3,291 Answers

Is this a new heater or 2ndhand ???

Posted on Dec 06, 2012


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Mr heater 45000 btu natural gas garage heater. Why does heater repeatedly fire for awhile then turn off?

double wall also check gas pressure seems like its overheating and hi limits are shutting it down

Feb 07, 2016 | Pool & Spa

1 Answer

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 that about 4 months old,and it started to act up, when I checked the circuit board I have three flashes. I removed and checked the pressure switch and that checks out fine, I get...

You may very well be right because if the induced draft motor won't come on then the heatin cycle stops there. It makes me wonder about the board because of it doing the same thing even if it's not calling for heat. Thanks.

May 13, 2011 | Mr. Heater Natural Gas Garage Heater -...

1 Answer

Mr heater 45000btu is flashing system lockout failed to detect or sustain flame.

check flame sencor is clean and connections are tight clean ignitor , seeif thie helps or jump out pressure switch see if it lights

Jan 15, 2011 | 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

As you can see the unit only pulls 3 amps.

Hope this helps

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

Not finding what you are looking for?

Open Questions:

See all Mr. Heater Natural Gas Garage Heater - 45,000 BTU Questions

Mr. Heater Natural Gas Garage Heater - 45,000 BTU Logo

535 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mr. Heater Heating & Cooling Experts

Paul Carew

Level 3 Expert

3291 Answers

Dan Webster
Dan Webster

Level 3 Expert

8220 Answers

Mack Baxter

Level 3 Expert

383 Answers

Are you a Mr. Heater Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides