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Intertherm furnace does nothing

nascar46747
nascar46747 Member Posts: 1
in Gas Heating

I have a intertherm furnace that does nothing check power going in has 120 volts has heat and air but it does nothing Thermostats not very old put new batteries in I can’t even get the fan to come on manually model mmha-070abhr-05 could use help thanks Jim

Comments

  • 109A_5
    109A_5 Member Posts: 1,472

    Hello nascar46747,

    I would check the user Fan Off On switch, is it a three position switch ? Also the Limit switch, Fan Switch, AUX Limit and if the transformer has 120 VAC on the primary and 24 VAC on the secondary when it should (is there 24 VAC R to W when the thermostat is not calling for heat or disconected). The link below I believe is to the correct manual for your unit, there is some troubleshooting information in it.

    image.png

    http://www.graycoolingman.com/uploads/1/0/6/6/10667336/nordyne_series_mg_mm_ms__mb_install.pdf

    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System

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