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

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I have just installed the Mr. Heater in my garage, and plugged in the heater without having the gas hooked up. Does the gas need to be hooked up before the fan will work.

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Unless the unit has a switch to run only the fan the fan should not come on until the unit heats up and calls for the fan

Posted on Mar 13, 2011

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I have a mr heater 75 btu garage heater it lites and stays on for 5 seconds and gos out relites gos out than it locks out


Try cleaning the flame sencor , check pilot is clean , check the tubes on the pressure switch are not split and are tight , there are high and low limit switches on there try jumping them out one at a time , see if any of this helps .

Aug 22, 2011 | Mr. Heater Natural Gas Garage Heater -...

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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 -...

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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
http://shopfnc.com/pdffiles/mhu45spec.pdf

As you can see the unit only pulls 3 amps.

Hope this helps

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

2 Answers

As soon as i hook up the thermostate it flashes the 3 flashes code and i have already tryed a new thermostate .... as soon as i unhook the thermostate it flashes for normal operation with no call for heat...


Try using it without the thermostat, tie the two thermostat wires together or put a jumper between
r and w. If furnace operates, you must have wrong style of thermostat

Jan 28, 2010 | Mr. Heater Natural Gas Garage Heater -...

1 Answer

We have a 75,000 Natural Gas Mr.Heater


Make sure you are using the R and W terminals both at the heater as well as at the thermostat. Try jumping the wires together without the thermostat and see if the unit starts. If it does, bad thermostat. If you continue to get the error code, you may have a bad board.

Jan 16, 2010 | Mr. Heater Natural Gas Garage Heater -...

2 Answers

Mr. Heater Natural Gas Garage Heater - 45,000 BTU. Power 120 volt and 24 volt good. Thermostat calling for heat, but nothing happening??


Check for a fuse either in-line or on the circuit board. There should be 24 volts going to the thermostat. If not, you have either a bad transformer or a bad thermostat wire. Jump out the terminals that the thermostat wires are connected to. This should force the unit to fire. If not, bad circuit board.

Dec 23, 2009 | Mr. Heater Natural Gas Garage Heater -...

2 Answers

Gas heater thermostat installation.


Wire to the R and W terminal on curcuit board and same terminals on the thermostat. The heater suplies the 24V

Jan 04, 2009 | Star Enerco Heat HSU45 Garage Heater 45000...

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