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

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I have a mr heater 75000 with a 4 flash blink code. the heater is brand new, only worked for 3 days. i have bypassed the 2 switches but still cant clear the 4 flash blink code.

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According to the Owners/Installation Manual, the 4 flash blink code indicates that the High Limit or Roll Out Switch is open. This may be caused by a venting problem or high altitude operation. make sure you have the proper pressure to the heater's regulator. For Natural Gas it must be a continuous 7 water column inches.

For further information, I have included a link to your Owners Manual that you can download and print, for future reference. http://www.mrheater.com/upload/newsletter/MHU_HSU_CUH_60016_BL.pdf

Hope this helped to solve your problem.

Posted on Mar 22, 2011

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http://www.heaterstore.com/images_templ/mr-heater-heaters-mhu45-75lp-ng.pdf

Hope this helps to get you headed in the right direction. If all else fails, call the Technical Service Dept at the number listed in the Owners Manual.

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