SOURCE: Robinair 34788 not pulling a vacuum
It's seems to be problem with your unit relay board,vacuum pump or pressure transducer.Most of Robin air 34788 machine having same problem.You can try as follows 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: ROBINAIR 347002K WON'T INJECT OIL
I think you'v try to inject the oil from ''WRONG'' side,as you say RECOVER/VACUUM which is LOW side manifold valve. You should inject the oil from HIGH side ( Turn the high side valve to CHARGE/OIL INJECT after vacuuming & low side vulv to CLOSE possition ) with pressing F1 key. once you press it then hold the key as long as you wish to inject the oil. If you try this way & you still have problem with oil injection then you may need to check oil injection CHECK VALVE or oil injection SOLENOID ( Both located under Hidg side panel mountin valve). NOTE: UV Dye is not a problem for oil injection! I hope this will help you to solve the problem,Good luck. Don't forge to vote for my solution!
SOURCE: ROBINAIR 34788 NO MANUAL REFILL
You may did not open the tank valve before you press fill key! please try as bellow:
Connect tank fill adapter to source tank & open tank valve then make the tank up side down,now press tank fill key. screen will change to checking source tank for 30/60 sec. then start filling.
If you try as above direction & still the problem exist,it may need to replace or rebuild tank fill solenoid.
SOURCE: Robinair 34788, Will not fill (IVS) tank from
Please check ''TANK FILL'' hose quick connector & ''LIQUID'' hose on ISV Tank & make sure both valves is opening properly.it sound like(one of those) close! If valves is Ok then check tank fill solenoid, it may need to rebuild or replace. If those are OK, replace ''TANK FILL'' Hose.
I hope this will help you to solve the problem, if so please vote for it. Gool luck!
You have to clean oil injector solenoid or replace the new one. To find oil injector solenoid (S3) in the manifold assy. see the attached picture marked with green arrow. Hope this will solve your problem.
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