Question about Robinair Cool Tech 34700Z Recovery, Recycling, Recharging

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WE HAVE A ROBINAIR 34788 JUST OUT OF WARRANTY. WILL NMOT PURGE AIR FROM SYSTEM AFTER TWO OR THREE VEHICLES. LOCKED UP. IS THERE SOMETHING THAT WE CAN DO AT THE SHOP HERE W/O TAKING TO REPAIR FACILITY 60 MILES EAST. DAVE S/. ztrbndr1220@frontier.com

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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.

Posted on Oct 01, 2010

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Posted on Jan 02, 2017

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Robinair 34788 keeps overcharging the isv how do i fix this issue or how do i find out whats wrong


Robinair 34788 Set Up Operation Part #1 - YouTube

? 6:05
www.youtube.com/watch?v=XW8o5tahLpE
Aug 30, 2013 - Uploaded by OTC TOOLS This video takes the viewer through the entire Set Up and Operation of the 34788. The Cool-Tech 34788 ...

Aug 26, 2015 | Robinair Measuring Tools & Sensors

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How to replace tank fill solenoid on robinair 34788


No, you cant remove tank fill solenoid until close low (Blue) and high (Red) side valve on ISV tank (Internal storage vessel). see attached picture to identify Tank fill solenoid. 39b3bb9f-14fe-4040-a186-3a3a23d2848e.jpg

Jun 18, 2014 | Robinair Cool Tech 34700Z Recovery,...

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I'm Archie i've a Robinair 34988 just five days old and having problem with it. It keeps displaying HIGH PRESSURE (HIGH PRESSURE RESET). whether you try to vacuum,recharge, refill or anything...


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. Just claim for warranty (Air purge solenoid and PCB relay board) from where you bought the machine.
Hope this will help to solve your problem, if so please vote for it for farther help! Good luck

May 16, 2011 | Robinair Cool Tech 34700Z Recovery,...

1 Answer

I have a robinair 34788 and when i tunr it on it shows a massage "hi pressure "


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

May 13, 2011 | Robinair Cool Tech 34700Z Recovery,...

1 Answer

34788 COOL TECH,FILTER LOCK OUT,REPLACED FILTER TWICE STILL LOCKED OUT,READS FILTER ERROR


Check the filter monitor air flow differential switch is not blocked or broken. have you a manual reset after filter change?

Aug 03, 2010 | Robinair Cool Tech 34700Z Recovery,...

2 Answers

Cool tech 34788 purges alot. Excessive purge time and set error messages for being unable to purge.


Please check 1# The refrigerant which you'v add to the machine, it may CONTAMINATE or NOT PURE R134a. the machine will purge continue while active VACUUM mode if refrigerant is not origenal ! Identify refrigerant if possible.2# Check the automatic air purge device & air purge solenoid repair or rebuild as require

Jul 13, 2010 | Robinair Cool Tech 34700Z Recovery,...

1 Answer

Cool Tech 34788 "air purge not working"


Please check ISV tank air purge (pressure) transducer & 12V DC discrete Solenoid ( both lacated on top of ISV ), it sounds like defective!
NOTE: Never use Automatic Mode till you are not very familiar with this machine

Jul 06, 2010 | Robinair Cool Tech 34700Z Recovery,...

1 Answer

Hi. We've got a CoolTech 34788. Whenever the machine tries to purge air from the tank, we are consistently getting a message saying that the "Air purge timed out". The internal tank shows ~10 lbs of r134a....


It's sound like normal. However when thes message come again you just press Stop/No key to terminates this function. Press Recover & see if the machine is going to recovery after self clearing. If it is then you can continue to work. Hope this will help you best of luck!

Jul 01, 2010 | Robinair Cool Tech 34700Z Recovery,...

1 Answer

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.

Jun 06, 2009 | Robinair Cool Tech 34700Z Recovery,...

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