Question about Mr. Heater MHU45NG
Checked pressure switch and is closed prior to trying to start, still get pressure open led signsl and no cab startup.
On your heater, does it tell you a fault code for the number of blinks?
If you have cycled the power to the unit already, the fault code should have cleared. If the fault code cleared and then came back, sounds like either a issue the blower motor being shot, or a relay in between the ignition controller and or the ignition control is bad, not making the heater do anything.
Posted on Nov 20, 2013
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Posted on Jan 02, 2017
SOURCE: MHU 75 Model Mr. Heater
The roll out switch is a small disc shaped part about the size of a nickle. There may be more than one. anyway there is a button shaped like a small peg in the center if it, push it in and it should stay in. You may need to re examine the limit switch, because this is what it sounds like. they are rated for a set temperature, so your application may need a higher temp. A simple way to check parts like these is to by-pass them by taking the wires off the part and connecting them together. If this solves the problem, that it. My only concern is that this is a new installation, and maybe its not venting adequately or its burning up all the usable air in the room. That's why most of these parts are on the equipment.
Posted on Dec 24, 2007
SOURCE: I have a Big Maxx
You may very well be right because if the induced draft motor won't come on then the heatin cycle stops there. It makes me wonder about the board because of it doing the same thing even if it's not calling for heat. Thanks.
Posted on May 13, 2011
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