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MODINE HD 75AH0134 GAS HEATER

lilzane
lilzane Member Posts: 12
in Gas Heating

unit comes on all flames good no rollout, but fan motor won't kick on. after it runs for a few it will shut down, I get 4 flashes on LED, that's says Limit Control or Flame Rollout switch open, but I suspect this because unit gets hot without the fan motor working could I be correct.

Comments

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 16,910

    Yes. The wiring and controls and fan motor need to be checked out with an electrical test meter to find the culprit.

    I would shut the unit down so you don't overheat the heat exchanger without damaging it

  • lilzane
    lilzane Member Posts: 12

    I also see 2 green ground wires on the chassis. 1 is connected the other is just loose, I am not sure if it went some where because I don't see where it may of went unless it was extra

  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 9,747
    https://forum.heatinghelp.com/discussion/comment/1834889#Comment_1834889

    Green or bare ground wires are important but will not be the reason your fan is not operating. Are you doing this DIY or do you think you need professional assistance. Are you good with electrical controls in other areas of your life? (Cars, electronic repairs, appliance repairs, etc.)

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

  • lilzane
    lilzane Member Posts: 12

    I'm an auto mechanic by nature, and pretty handy, I can fix a lot things. I can use a multi meter. but most of all I follow instructions very well

  • JUGHNE
    JUGHNE Member Posts: 11,312

    Picture of unit showing controls and wiring diagram (which should be somewhere on the unit), would help.

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