Cool Tech 34700Z Recovery, Recycling, Recharging: when performing a/c system charging see bubles in ...

You confirm it by how it functions, if it sticks in a mechanical way there is no electrical testing that would be valid. I would just replace both solenoids.

There is a site www.nytechsupply.com you can down load a pdf manual free of charge. it will have the
instructions and any thing pertaing to your recycling machine. good luck!

Filter must be change every 150LBS of recoverd refrigerant !!!

It's not clear that you machine is doing recover or not! If the machine is doing recover theh follow the bellow steps.This is a common problem of Robinair 34700Z / 347002k

Please check 1# OIL DRAIN solenoid, 2# OIL DRAIN switch, 3# OIL DRAIN CHECK valve. It sound like one of those are faulty.
Hope this will help you to solve your problem, if so please vot for my solution. Good luck!

Which model of Robinair machine you are using ? If it's 34700Z then follow as: After Recover & Vacuum, Press "CHARGE" button on contro panel & add the amoun you want to charge then press ''YES" button.

I don't think your machine have any problem! But if you are sure then you can rebuild oil drain solenoid.

You can try to get it from robinair official web side www.robinair.com

Please Check the following with min.2.5KG of refrigerant in ISV tank:1#Check high side small recover solenoid (in small manifole assy.) it's may neet to rebuild.2# Check main charging (in main manifold assy.)solenoid,rebuild if need.3# Check ISV tank liquid hose is connected properly & make sure it's not too much tight OR loss.3# Check high side coupler is opening properly.Hope this will help you to solve the problem.

Please do the following 1# Check your machine ISV tank liquid line quick connector.it's seems to be very tight,open little & try to charging.2# Rebuild charging solenoid.