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    plmayo's Avatar
    plmayo Posts: 2, Reputation: 1
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    #1

    May 23, 2008, 05:32 PM
    Locating the right fuse
    I was changing the pipe insulation on my exterior units( now I hear this is not necessary) when the power went off on one unit. I checked the breakers, turned off the power and checked the small wires outside. The insulation on the wires had deteriorated so they may have touched each other causing a fuse to burn out on an interior board. This I was told over the phone by a electrician. My problem is which fuse, what does it look like? The system is about a 12 years old Tempstar. I'd be grateful for any feedback. Pat
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #2

    May 23, 2008, 05:53 PM
    Sometimes there are no fuses and the 24 VAC transformer burns out. Look for automotive style fuses on the circuit board. Around 3 Amps and possibly blue.
    plmayo's Avatar
    plmayo Posts: 2, Reputation: 1
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    #3

    May 28, 2008, 08:00 PM
    There were no fuses. It did turn out to be the transformer. Thank you for your expertise.
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #4

    May 29, 2008, 07:40 AM
    I would also replace or repair the uninsulated wires or it will happen again
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #5

    May 29, 2008, 02:17 PM
    Add a 3A automotive blade type fuse on the secondary (24 V side).
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