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When one of my aircon units stopped working I searched the internet and came up with a number of possible problems.
The issue I had was that one unit was not cooling or heating. When I turned it on I could hear the relay switch clicking and the fan would blow room temperature air.. There was however no cooling water being pumped through the system and the compressor was not starting when I switched on this particular unit. The water pump did work when I turned on one of the other units.
I had to find out what part had failed and was stopping the compressor and water pump activating.
It was an easy fix. Watch the video and the part number is shown in the video.
I hope this video helps you if you are having a similar problem.