This kit will fix most trouble codes on this heater. If there are no led flashing codes remove the blue and yellow wires that come from the transformer to the circuit board. Measure for 24 volts ac at the transformer. If the 24 volts ac is not present you need to test the input voltage to the tranformer for 110 voltage. If the 110 voltage is present replace the 60025 transformer which is not part of this kit. Click Here for part number 60025
The following parts are included
1) 60105 Control Board
1) 60147 Pressure Switch rated at 0.28" of Water Column
1) 60139 Electrode Kit
1) 60015 High limit Sensor (4 Flashes= High limit 60015 or Rollout switch 60022 (Resettable) is in the open condition)
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Fast service and responsive to questions. Great to deal with.
Fits my MHU-50 perfectly. All parts installed and worked as expected. Fast shipping and packaged properly to avoid damage during shipping. I was having issues with my Mr Heater MHU-50 starting up but not turning the burner in. Mr Heater thought it was the pressure switch but I was not getting the three blink error in the circuit board. I was not getting any error codes. Ended up being my circuit board was bad. This kit fixed that issue.