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

    Dec 5, 2007, 06:41 AM
    Would a bad transformer prevent blower from working?
    Furnace turns on but blower will not work. I was told it is the transformer. Could it be and what does it do?
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #2

    Dec 5, 2007, 07:05 AM
    The transformer provides power to relays or contactors, to engage the Big power(blower). That way thermostat does not need very large wires. (relatively speaking)
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
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    #3

    Dec 5, 2007, 08:55 AM
    A bad transformer and nothing happens except some furnaces default to the blower running.

    Go to the sticky at https://www.askmehelpdesk.com/heatin...ons-58313.html
    Follow the sequence of operations and see where it stops. Try to figure out the code is it has a red blinking light.
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #4

    Dec 5, 2007, 09:16 AM
    Likely who told you it was bad, measured primary voltage in, voltage was present, and there was no low voltage out. Less than $20 part.
    Primary, and secondary voltages need to match existing. And the Volt/Amp rating should match or exceed existing transformer.
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