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Carrier infinity ac: removed thermostat lines (4) at outside unit to re-route. Reconnected, double and triple checked. No power now to thermostat

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  • rdroles Feb 01, 2010

    Since I know I am getting power to the outside unit (checked with voltage meter), it must be the transformer. I will need to call service. Thank you for your help

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If you took the wire off outside at the unit you may have tripped a beaker inside the house so check all your breakers. Or the worst case is you may have shorted out the transformer. The transformer will be located inside at the air exchanger unit or the main unit in the house. The transformer takes 110 volts Ac and converts it to 24 volts Ac for the low voltage side, Ie. the Thermostat, and any controls (relays, switches). It may be hard to access or even see depends on model. But check for voltage on the transformer itself.

Posted on Feb 01, 2010

  • Thermo King
    Thermo King Feb 01, 2010

    I was thinking about your problem. If your unit has an electronic thermostat you may take out the batteries or reset the t-stat. It may have sensed the disconnection and gone off line. The thermostat will be the week link in the connections from the transformer to the condenser unit outside.

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