900H Compressor loading during warm up.

by Morgan
(Trinidad and Tobago)

I have a 900H compressor that is loading before the warm up cycle starts to 125psi which normally is 65psi.

I checked the Start/run solenoid and it seemed to be good.

I went a step further and changed out from a working machine and the same issue occurred.

I check the minimum pressure valve to see if it was stuck in the open position which also was not the case.

Is there something else that I can troubleshoot to resolve this issue?

Comments for 900H Compressor loading during warm up.

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Jun 29, 2016
Compressor loading solution
by: Bill

Thank you Morgan for taking the time to update your question, and to help others that may have the same compressor problem. Cheers!

Jun 29, 2016
Problem found
by: Morgan

After going further into the issue I have found that the current was not coming into the magnetic solenoid. When tracing back the wires in the diagram there is a relay which was not getting the current to activate it. The signal is supplied from the compressor and engine warning/shutdown circuit board found behind the instrument panel. I swapped the board and the machine is working properly and has all the correct PSI's.
Thought I would put the answer up incase anyone else has the same issue in the future.

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