Another Mr Heater Big Maxx that needed the "Burner Over Fire fix"

[Mr. fix it]

Hi there GJ members!

I found this site again yesterday after installing a new Mr Heater Big Maxx 50,000btu unit into my garage.

I had expected it to work right out of the box but it was strangely similar to this thread which I didn't continue on with in fear of being beat down for adding to a 4 year old thread! LOL!!

http://www.garagejournal.com/forum/showthread.php?t=126451

So here I am creating probably yet another thread about how the B/N Mr Heater Big Maxx unit didn't work after throwing a 4 blinking LED code.
so after reading the thread I was not 100% sure that this was the fix but I went ahead with it and pulled the heater apart to do the "Burner Over Fire Fix" on the top burner.
I had thought this may ahve been the issue since I had observed the blue flame coming from the top of the burner just like in the pictures I saw.

When I pulled it apart much to my surprise, the Mr Heater company had already applied a fix which was a spring clip that wasn't quite doing the job to pinch off the top on the burner.

The clip was added to the top of the burner instead of along the length of the gap that needed pinching off.

I rotated the clip 90 degrees so it was over top of the length of the gap and it closed the gap enough to correct the situation and now the heater is working fine!
Sorry I didn't get any pics before buttoning this up, I was more concerned about getting this up and running...

 

[Mr. fix it]

Well it was too good to be true. this fix didn't cure the issue like I thought it would.
So I will be contacting Mr. Heater tomorrow to see what they have to offer for tech support...

 

[Plugger54]

what does the 4 blinking code mean?
Propane or nat. gas? Altitude above sea level?

 

[Mr. fix it]

500 ft above sea level

4 blinnking LEDs is defective roll out switch or heat exchanger limit switch

 

[Mr. fix it]

And its' natural gas as out of the box.

 

[Master o None]

Old thread I know, but here is what worked for me
Problem- No Heat, flu fan and blower fan constantly on. Circuit board is flashing 4 times (high limit switch)
Solution- (completely by chance) Turn off power, removed high limit switch, turned it over a couple times, and started to hear a "clicking", so I shook it, lots of clicking, (almost a rattling sound). Re-installed, and BAM! heat!
YES The furnace burner is shutting of normally as usual.
I have ordered a new switch, but for now all is well until the new one shows up.

Mr heater Big Maxx 80k, 2 years old

I blame the cheap parts on this failure

 

[D45]

Need a burner pinch weld mod

Hot Dawg 75K Fault Code

So, I went to turn my heater on this morning, just to make sure everything was good..........nope It turns on, fan blows, and no warm air I take off access panel and the LED has 3 flashes Any quick and easy ideas, that I can check myself?

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