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I have a 20.00btu mr heater blue flame..when its time for it to kick off the heater does not shut the flame out it just flickers until it goes out.can you tell me whats wrong.

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  • Heating & Co... Master
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Ld be dirt on the valve seating not letting it cloes fully.

Posted on Dec 29, 2016

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I have a Mr Heater infra red propane wall heater. My problem is it turns itself off (pilot light) after running for an hour or two. I have no problem getting it turned back on but for some reason it d


Your pilot flame should be blue with a small yellow tip, and it should cover the thermocouple (a small rod in front of the pilot light). If the flame is too small and doesn't cover the thermocouple, it may be adjusted too low, or you have low gas pressure or you have a leak in your gas line coming in to the heater. If the flame looks like a lazy yellow flame, you are probably not getting enough air to the flame. Check that your air openings around the pilot are not clogged up. If the flame looks like a waving blue flame then you probably have excessive draft at the pilot. If the pilot flame looks good and covers the thermocouple, then the thermocouple might be bad. Best of luck. I hope I have helped.

Nov 23, 2013 | Heating & Cooling

1 Answer

Fires and runs for a few minutes then shuts off tries to re fire a few times then goes to 2 blinks=cannot sustain or detect flame.


There is a flame sensor located in the last burner that lights up. It is either not seeing flame or not getting flame to it within a certain time. Check the wire that comes from it and goes to the circuit board for a bad connection. Check any ground wire connections for a bad connection. Pull out flame rod (sensor) and polish it with a scrub pad or soft wire brush. If none of these recommendations help, replace the flame sensor. Make sure the flame travels to the last burner, if not, clean the flame tray that allows the flame to go from one burner to another.

Feb 13, 2011 | Mr. Heater MHU75NG

1 Answer

I installed a Mr Heater 45,000btu heater in my garage, when I turn it on to fire, it fires for a moment, I get about a 3 inch flame for a moment and then it goes out. What do I need to do?


clean the flame sencor first check connections on flame sencor , check you have gas to heater check limits high and low jump then out one at a time see if it lights , or check pressure switch if fitted jump this out and check tubes to it

Jan 20, 2011 | Mr. Heater Natural Gas Garage Heater -...

1 Answer

Heater turns on and heats garage to set temperature, than shuts off. when the temperature drops, the unit kicks on again. everything starts working again but only for a few seconds and than shuts off. it...


Problem: Your furnace will not ignite the gas to produce heat for your home. When a furnace has a bad ignitor what I see most of the time is the following sequence of operation:


1. Thermostat calls for heat. 2. Draft inducer motor starts. 3. Pressure switch attached by a small plastic or rubber tube senses the negative pressure produced by the draft inducer and closes. 4. Draft inducer runs for 30 seconds to a minute before you hear a gas hissing sound. The ignitor did not glow, the flame sensor (a small metal probe about 1/8" in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the hissing sounds stops with no ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. Then the sequence starts all over again with no ignition of the gas. Solution:You probably need to purchase and install a new ignitor. I would suggest that you inspect your ignitor closely for cracks. Make sure you do not touch the ignitor with your bare hands. If you do not visually see a crack, then you could have a furnace control board problem or a limit, rollout switch problem. The furnace's control board might not be supplying the voltage to the ignitor.If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.

Dec 11, 2010 | Mr. Heater Natural Gas Garage Heater -...

1 Answer

Heater will not stay lite


It can either be your pilot orifice is dirty and not sufficiently heating the thermocouple or your thermocouple is defective and needs to be replaced. Is your pilot flame yellow or blue? It should be a strong blue flame impinging directly on the thermocouple. If it's not, shut it down, take a can of compressed air and blow out the dust, spider web or whatever is inside the pilot assembly where the pilot flame is. Then try relighting it and see if that improves the flame and keeps it lit. Otherwise, just replace the thermocouple. Douglas

Sep 30, 2010 | Mr. Heater (F274825)

1 Answer

Heater shuts off , it shuts down after a minute or two looks like low flame and its blue in color i do hear a popping sound when it shut off


The heater thermostat senor for this heater could be bad or indicating a abnormal temperture shutting it down. You might want to return item if still under warranted

Nov 06, 2009 | Mr. Heater (F274825)

1 Answer

Mr Heater MH75KT - won't start with diesel


If the MH75KT is the correct model, then it is a Kerosene only heater. Fuels, like oil and diesel all have different ignition points.
http://www.mrheater.com/upload/newsletter/70276_MH_HS_50_75_125_175_210KT_REV%20A.pdf
See page 3 of the manual.

Feb 03, 2008 | Heating & Cooling

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