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

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Cool Tech 34788 "air purge not working"

My last post had incorrect info. While my Cool Tech 34788 is in Automatic Mode, the message "Charge in progress, purging air, wait..." comes on and lasts about 5-7 minutes. Then the message "Air purge not working, any key exits" comes up. Hit any key and the Automatic cycle ends. Any ideas?

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  • 180 Answers

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

Posted on Jul 07, 2010

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Posted on Jan 02, 2017

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2 Answers

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

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...


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.

Sep 28, 2010 | Robinair Cool Tech 34700Z Recovery,...

1 Answer

I'm in afghan and I have a robin air cool tech 34788. It's take a long time to the clear the line and and a long time to recover plz help me out


I think your machine is working normal! Robiaair 34788 is high bred technology machine, you can't forse on it to fast recover! It will compleate the process it self. However if you still think this is not working normal you can check low/high side hose & coupler for any block.
Hope this will be helpfull to you. Good luck

Aug 24, 2010 | Robinair Cool Tech 34700Z Recovery,...

1 Answer

How do you perform a manual reset on a 34788 cool tech filter replacement with filter lock out and no filter code accepted?


There is no way to reset without filter code. This machine ( Model-34788) will not accept even new filter code,if filter from old verson (manufacture before the machine). However try with this code-FD32C46B01. I'm sure this will work! Good luck & vote for my solution.

Aug 05, 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

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

I have a Robinair 34700, during vacuuming and recycling I lose about 200 g refrigerant gas.


Don't worry this is normal.Because while machine is running for vacuum or recycle mode,automatic air purge device will active for some time & it will purge air from ISV.

May 28, 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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