Question about Ruud UBHC Air Conditioner
Heat pump unit will not operate on cool cycle, and I checked for 24 volts at the thermostat (no volts). Proceeded to blower unit and found that transformer primary side was shorted out and secondary side was ok. Replaced transformer and switched thermostat to fan only, and the blower operated. Next, switched to Auto and Cool and lowered temperature; but blower unit did not operate. Checked blower unit and found same problem--a blown transformer. I appreciate it if you can troubleshoot my problem.
Blown transformers are usually from a low voltage short the first thing i would do is wire a automotive or resetable 3amp fuse in line with the transformer so you dont blow transformer after transformer the wire coming off the transformer that say 24v take that wire a couple of inches down and cut it and install the fuse in series there
now you can go through your low voltage wires one by one and test them unhook all the wires to your outdoor condenser at your indoor unit(furnace or airhandler) and try turning it to cool now if you blow the fuse the short is between the tstat and the indoor unit if the fuse is still good leave it on cool and hook up one wire at a time to your outdoor unit starting with R a lot of times your contactor or your defrost board will short out on you also look for pinches in wires wires with cracks in the insulation and wires touching metal this situation can be a real pain sometimes i would recommend calling a hvac company if you start to get stumped
hope this will help you
Posted on Jul 26, 2009
If the control voltage (24V) side is cooking, look at the thermostat/control voltage wiring shorted. Possible control board issue.
Posted on Jul 26, 2009
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Posted on Jan 02, 2017
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