20 Most Recent Mr. Heater Natural Gas Garage Heater - 45,000 BTU - Page 4 Questions & Answers

No, Exhaust vents on heaters should always maintain vertical orientation because heat rises and creates a natural drafting drawing the fumes out. You have a monoxide poisoning situation otherwise.

Probably a bad 'flame sensor' causing the shut down. The flame sensor is the safety that prevents the gas valve from opening without a flame to ignite it. It is located right at the pilot light or the ignition point if you have a electronic ignition. If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

it sound like the blower motor may be seizing up. try spining the blade by hand to see if it feels free or not. the motor could be trying to turn but can then tripping itself out on overload. (most motors have built in safety overloads which will trip during an overcurrant event. aka too many amps.) you may have to replace blower motor

I had this same problem with my heater. I cleaned the propane tube where the flame comes out (after it’s off and cooled down) with a Qtip and some alcohol. After removing some cotton, it will fit all the way down to the end of the tube. Repeat until it comes out clean and stays lit. I had to repeat with 91% rubbing alcohol and more Qtips, and most of the cotton removed.

Check out the pressure switch . and the snap disk .

check the pressure switch and the snap disks

Tis atomizing the fuel so it'll burn hotter/better. up their loud tis normal.

You will probably need to remove the pilot orifice and clean it out use a small needle or orifice cleaning rod. The pilot flame is not big enough to keep the thermocouple engaged.

Yes no flame to thermocouple it will shut off

With multimeter check l1 to ground on control board. Also check 24vac to ground to verify high and low voltage present at board.

chw=eck flame sinser need clean

There is nothing on line about heat shields I would go direct to M r heater with model and serial number and ask them .

may be low fuel flow video below have some suggestions. https://www.youtube.com/watch?v=L5UNAvPWXNE https://www.youtube.com/watch?v=JU8dS8XNU7k https://www.youtube.com/watch?v=VLbA_DFlqoQ https://www.youtube.com/watch?v=s58YeeyD0zE https://www.youtube.com/watch?v=kdnOhjev3BU manual below troubleshooting starts page 13 https://www.mrheater.com/downloads/dl/file/id/275/mr_heater_20_30k_btu_propane_vent_free_manual_2016.pdf

Chances are the thermocouple needs replacing.

The responses so far I don't believe are answering the question. Instead, they are mentioning potential problems not related to the question.

The Mr Buddy propane heater has a sensor which detects the amount of oxygen/fresh air in the area being heated. If the amount of fresh air/oxygen is too low, the sensor will shut off the propane flow to the pilot light and burner. The question is asking, how to bypass/disable the sensor.