When you say checks out good what does that mean? If 24 volts is applied to the contactor it should "Pull in" and you should hear a slight buzzing sound. If that is happening then you have lost line (240 volt) power and should check circuit breakers and the dis
connect that is on the wall of the house beside the unit.
SOURCE: reversing valve
The first thing you need to do is fix the hole in the coil. It will only get worse no matter what you do. The reversing valve is controlled by the thermostat, then to the defrost board, as it has a timer, sensor and all that jazz. As to your question, that is a tricky one. The way I found worked best for heat pumps is to turn it to cool. If its so cold outside that it will not turn on because of an outside thermostat, cover the coil and yourself with a cardboard box or a large tarp. Give yourself some room of course, get a set of gauges that has temp. ring for R-22.Take suction temp. from the line about 1 foot from the compressor, look at the low side of the gauge and find the temperature, not the pressure for R-22. You should have a 20 degree differential. If more than 20, add freon, less remove. This sounds a little odd, but its easy to overcharge heat pumps on the heat mode. The condenser has a sensor that switches on the electric heat if the heat pump is not working. Ice on the condenser is normal on heat mode, that's why there is a defrost board.
SOURCE: condenser fan will not work
Check to see if you have 220 to unit. May have bad breaker. Only feeding one leg. Rusty
SOURCE: Blown Transformer heat pump
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
24v----------------
24v----------x----------
24v--------{3ampfuse}----------
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
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