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  1. O

    Mastertemp 125 heater won't fire

    Yes; when I was reviewing the troubleshooting instructions I decided to purchase some of the items that it was pointing towards (HSI, ICM). The only thing I didn't purchase was the gas valve so that set me back 2 weeks.
  2. O

    Mastertemp 125 heater won't fire

    OK; I replaced the ICM and it’s working now. Thanks for all of the help!
  3. O

    Mastertemp 125 heater won't fire

    Thanks; that wasn’t clear to me. So this would say I need to replace the ignition control module?
  4. O

    Mastertemp 125 heater won't fire

    I checked the air pressure switch; it’s good.
  5. O

    Mastertemp 125 heater won't fire

    I don’t see an ignition control igniter relay?
  6. O

    Mastertemp 125 heater won't fire

    I’m measuring the voltage at the connector to the igniter. All the manual says is that it should be something between 0 VAC and 120VAC since it’s actually an intermittent pulse.
  7. O

    Mastertemp 125 heater won't fire

    Hello, I have a Mastertemp 125 heater (3 yrs old) that stopped working about 3 weeks ago. It worked fine until then and now it won't fire. No diagnostic LED's. The blower comes on, I can smell gas, lots of clicking noises but it never fires (goes through 2 cycles) and then I get the 3...