Question about Ruud UAKA030 Air Conditioner

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I tried changing the thermostat (unsuccessfully) and may have blown a transformer. My AC unit will not turn on. Is this an inexpensive repair?

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If you did not turn off power and or have a hot wire touching a common wire you blew the transformer. There is a possibility your air handler has a 3 amp fuse on a control board. Check it first. If it is OK,replace the transformer.

Posted on Sep 24, 2009

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I think that most likely shorted out your low voltage transformer. Transformer is most likely located in air handler. You may find a blown fuse for transformer or bad transformer.

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Hello, some units have a condensate safety switch that will cut off power to the thermostat when the drain line is clogged, A wet/ dry vac must be used to clean out the drain line before the thermostat will receive power again. Amother reason could be either a blown fuse or burned out transformer.

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My dog chewed the thermostat wire by the compressor, i replaced the chewed wire now the thermostat won't turn on, therefore; no ac.. could it have blown a fuse? if so, where are they?


Either you have blown the low voltage fuse located inside the air handler (if there is one) or you have blown the transformer feeding the low voltage control wiring.

If the transformer is blown due to no fuse installed, I would recommend installing a low voltage 3A fuse in line with the red terminal coming off the transformer. This will protect the transformer in the future.

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I replaced the thermostat because it wouldn't turn on, it still doesn't turn on. What else can I check?


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Well you have a good transformer and the fuse is not blown. So I would look for the most obvious thing which is the relay. Why the relay? Well most units do double duty as air conditioner and heater. AC and heat require different fan speeds. The relay shifts the fan from low to high for ac. The fan runs on low for heat. In rare instances it could be a bad wall thermostat but most times not. You know the fan is good because you can get it to come on manually.

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Have a Ruud AC unit the problem I have after installing a new condenser fan motor when I throw the circuit breaker the unit will not turn on but when I push the contacts on the contactor in manualy the fan...


The contactor engages from low voltage power from the thermostat as does the outside condensing unit. You may have blown the low voltage transformer or have a loose thermostat wire. Check line voltage(220 volts) to the transformer. Check load voltage(24 volts) from the transformer. If no voltage out,replace the transformer. If you have voltage out(24) check the thermostat wires and the thermostat. If you have a digital thermostat there is a 5 minute delay in the thermostat after power is restored before it activates.

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