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Can a bad transformer send more than 24 volts to thrmostat

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No. A transformer will only change the voltage upwards or downwards. If a transformer winding shorts out then the voltages would be lowered if unit even worked at all. Generally a shorted winding will cause the unit to overheat and just burn out completely; or the protective fuse will pop.

Defective electronics on power supply could account for incorrect voltage if the built in voltage regulators are not working properly.

Posted on Nov 23, 2013

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