Question about Mr. Heater MH75KT

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Mr heater 75,000 btu kerosene heater

Worked fine 2 days ago. Nothing happens when turned on.

Flashing error code says "HLS open"
nothing in the manual describes this error codes.

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HLS should stand for high limit switch(control) this model does show one in the parts diagram.

Posted on Mar 02, 2008

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I got this error when I had increased my air pressure to 5.5 lbs. Cut the pressure back to 4.5 and it has been running fine for the last three hours. At 5.5 it got WARM ... solid red hot cone and flames coming around the outside. Had been having problems with it cutting off for no apparent reason in really cold weather. Took the pump apart and cleaned it and checked for clearances and reassembled but it did not help much. Will schedule it for a total pump replacement with new filters asap. Pump parts and filter are not that bad. Should come in under $50.00
Hope this helps
I also turned the thermostat back a little off of full on.

Posted on Feb 04, 2009


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