SOURCE: high presure rest on robinair 34788
It's seems to be problem with your unit relay board,vacuum pump or pressure transducer.Most of Robinair 34788 machine having same problem.You can try the following 1# Open vacuum pump oil filling cap to release extra pressure from pump.2# Replace new relay board & follow the on screen message(do not skip any option).3# Check pressure transducer is working properly.I hope this will help you.
SOURCE: WE HAVE A ROBINAIR 34788 JUST OUT OF WARRANTY.
Opeen front cover and check air purge solenois (12VDC) on top of ISV (Internal storage vessel) tank. It may need to replace solenois coil or rebuild solenoid assy.
SOURCE: I have a robinair 34788
It's sound like problem with oil drain solenoid or harness. please check harness of oil drain solenoid. If harness is ok & connected with relay board then you need to replace oil drain solenoid.
SOURCE: robinair cooltech 34788 scale error reset
You may overfill the ISV tank. #1 Open front cover & close LIQUID valve on the ISV. #2 Disconnect LIQUID hose from tank,then open tank liquid valve (which you close earlier) to reduce some refrigerant manually from the ISV tank. #3 after reduce refrigerant from tank, re-connect everything & switch on the machine. #4 If you still have the same problem then you have to re-calibrate the scal. I hope this will help you
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