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I'm working on a Payne gas pack furnace heater and a/c unit. I replaced the tstat cause the a/c worked but not the heat,also replaced the spark ignition module with gas valve,the transformer, and the contacter now nothing comes on.

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  • jr0907 Jan 03, 2009

    i do have 24v coming from the transformer going to the ignitor module. I also checked the voltage at the breaker panel and i have 120v on each leg, but only 120v at the unit.

  • jr0907 Jan 03, 2009

    yes it does have a fuse block and i replaced both buss fuses and also replaced the 30 amp. breakers in the panel.At the breaker panel i have 120v on each leg but at the unit i only have 120v at the fuse block instead of 240v.

  • jr0907 Jan 05, 2009

    yes this a package unit,it's all outside and i already traced the power wire and it's ok. On the transformer i'm getting 120v going in and it's a step down transformer rated at 208v or 240v down to 24v,is the problem before the transformer

  • dwkcool May 11, 2010

    ok you need to find out at the fuse block where you are loosing power and are you testing the fuse block with or without the fuses in it and have you took the fuse block apart and checked the connections

  • Donni McMasters
    Donni McMasters May 11, 2010

    You said you are reading 120V for a transformer that is rated 208v 240v? Then you don't have enough power coming into the transformer. It should read 240v entering and 24v leaving.

  • dwkcool May 11, 2010

    if it is a package unit can you get to your power wire going to the unit and trace it back to the breaker box

  • dwkcool May 11, 2010

    this is a package unit all outside or a split system

  • dwkcool May 11, 2010

    need to find out where you are loosing voltage does it have a fuse block or breakers

  • dwkcool May 11, 2010

    if you have a test meter see if you have 24 volts coming from the transformer

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Pull the fuses and check voltage line to line with the fuses out you should have 208 to 240 volts if you have 50 or so volts try line to ground if you have 120 on one leg it will back feed with the fuses in,because of the windings involved. in any case you are missing one leg somewhere to get the voltage readings that you have poasted

Posted on Jan 11, 2009

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