Quote Originally Posted by Tiger
What is your refrigerant pressure when running?
I was going to say...

Mine used to do something similar to this, and it eventually transpired the A/C gas pressure was approaching minimum tolerance...

Flip on the A/C and the low pressure side would drop out, causing strange behaviour in the controller... AC wouldnt restart after a shut-off.

Dont these systems have high pressure switches as well, to tell the controller that the system is overgassed?