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How To Repair Air Condition Digital Termostat
An air condition technician brought this for repair. It powers on but for some reason the air compressor does not kick in when it is needed.
This unit is connected to the air condition unit and cannot be powered separately.
This is an old device used for old models air condition units.
This is the model number; I found it inside the actual unit.
The problem here is how can I test a unit that cannot be powered separately? The simple answer to that is I have to test all the parts on the board one by one. That is not the best way to do repairs.
Since the problem was the compressor line, the common sense suggests starting on that line and see what is going on there. The next step is to find that line.
I checked inside the unit; the compressor is line three.
In order to trace pin three, I had to take the relay off board. The relay was the main connecter to that line and the best way to start is checking the relay.
Arrows show the coil pins. I applied 24 volts there and it clicked when I checked for continuity on the other pins, there was none. Ah, a bad relay.
Here you can see the specification of this relay. A common relay in air condition units and was not hard to find. Once I replaced the relay, I took it back to the customer’s house, hocked it up and powered it up, it worked like a charm.
Sorry, could not take a picture of that thing working. It is not any easy thing to do at a customer’s house.
It was a common sense repair, although I could not power it up. Always ask customer about the fault and do your own search and repair.
This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.
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