Robinair model 34788 has a high pressure message when operating the machine. Purging the air with the charge function does not seem to resolve the issue.
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: 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: i have a robinair 34788 and when i tunr it on it
This is a common problem of Model: 34788,
34788-I, 34988, AC34788, GE48800 etc.
You need to replace air purge solenoid (Air purge solenoid located on
top of the ISV tank, if you open front panel cover then you can see it on top
of the tank).
After doing above stapes and your
problem still exist then you have to replace PCB relay board.
Hope
this will solve your problem, if so please vote for it for farther help! Good luck
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