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Heater/AC outside unit.....Goodman PGB042-100-1 Unit will not run.

Started blowing 5 amp fuse on control board, now unit will not run and fuse is good.

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  • Earl Parker
    Earl Parker Mar 21, 2014

    I have no 24 volt present on transformer secondary. 240 is present on primary but when I remove power and check continuity on primary it is showing to be open. I have continuity on secondary and no shorts from primary to secondary.

  • if you got reading voltage on primary and no reading on secondary that your transformer is defected opened or shorted winding

  • if this happen only when you turn on ac you must check the 2 wires to outside unit to make its does crossed. if this 2 wires is not crossing that mean your contactor at out unit is shorted caused your transformer to burn up.

  • good luck

  • p.s. showing continuity could mean it burned and shorted together

  • Earl Parker
    Earl Parker Mar 21, 2014

    Replaced transformer and unit ran after i turned thermostat up started getting hot so i turned thermostat down and unit cycled off but now it will not run in either cool or heat modes.

  • At thermostat take it loose jump wires R to Y and G your AC should come on. Jump R to W your heater should come on. if you'v done this and it work as I described then you have a defected thermostat



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With new fuse in you need to check if there is 24v from transformer and at the 2 control wires that go to outside unit.

Posted on Mar 19, 2014


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1 Answer

Brand new furnace wont start its a aruf 14 electric air handler with a 10 amp heater coil

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You mat have a bad contactor at the outdoor unit.

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