Question about Mr. Heater MHU45LP
Heater is flashing 3 times indicating pressure switch failed closed before CAB is energized wondering what this means.Is this gas line pressure
Just purchase the 75k btu natural gas Mr. Heater. It would light and run until it reached the setting on the thermostat, then wouldn't relight and had the code 3. I found when assembled from the factory, the service door was install unside down. This heater can be installed right side up or inverted. Once I turned the access door 180, the heater works like a swiss watch. This heater works perfect to heat my 750 square garage. Very satisfied.
Posted on Apr 01, 2012
The pressure switch to which you are referring is the switch connected to the suction side of your induced draft fan. This pressure switch will have a hose connected between the switch and the induced draft fan. Please let me know if you need any more assistance.
Posted on Feb 17, 2009
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Posted on Jan 02, 2017
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