Want to purchase a 34788NI-H Rob Cooltech machine. This year GM made us buy the same piece of equipment but for the 134yf Freon. That machine is extremely slow, is the 34788 that slow also?

Question edited for a lot more clarity. All questions need full 'make model (what is is)'.
Question moved from Office Equipment to model category.

https://www.google.com/search?q=robinair+34788ni+errors+list

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Yes, that's correct. These are the most common causes for a dryer to have a light that turns on but the machine won't run. It's important to check each of these possible issues to determine the root cause of the problem and fix it accordingly. If you're not comfortable doing the troubleshooting and repair yourself, it's best to seek the help of a professional technician.

To manually purge excess air from the tank on a Robinair 34788NI, you will need to follow these steps:

1. Connect the recovery machine to the vehicle's A/C system and open the valve on the recovery cylinder.

2. Turn on the recovery machine and let it run until the high-pressure gauge reads about 500 psi.

3. Turn off the recovery machine and close the valve on the recovery cylinder.

4. Disconnect the hose from the recovery cylinder and open the valve on the recovery cylinder to release the pressure.

5. Close the valve on the recovery cylinder and reattach the hose.

6. Turn the recovery machine back on and let it run until the high-pressure gauge reads about 500 psi again.

7. Turn off the recovery machine and close the valve on the recovery cylinder.

This process should help to purge any excess air from the tank. It's important to follow these steps carefully to ensure that the recovery machine is used safely and correctly.

You have to contact them direct.

https://www.google.com/search?q=Password+for+service+menu+on+a+Robinair+34788NI

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Manifold solenoids identification for 34788NI. Hope this will help you.

we are computer help, not
Robinair 34788NI-H Premier R-134A Refrigerant Recovery, Recycling and Recharging Machine for Hybrid and Non-Hybrid Vehicles
sorry post to cars forum.

did you registrar and activate, call robinar, this still under warranty.

Lori,
You cannot just go out and buy Freon to put into a refrigerator like you can for a car. They take a different kind of Freon and you have to have special equipment to put it in. I would suggest calling a repairman and discuss your problem with them to see if you should have them come out or just replace the unit. One of the things you should also consider is the age of your current refrigerator. If it is more than 10 years old, you might just want to use the money that you would put into a repair call into purchasing a new refrigerator. Hope this helps!

Problem is that the "new" R134 is somewhat "thinner" than the older, more reliable R12. Therefore, every seal in the entire system needs to be absolutely perfect, otherwise, it leaks out. I've even seen hoses that will bleed freon though they appear normal in every respect. Don't be tempted to add "do it yourself" freon that has sealant in it. I've never seen any of that work and further, I know it will gum up the expensive equipment repair shops use.
The problem is not isolated to GM vehicles. Therefore, switching to another make won't cure the problem. Only difference is that some, regardless of make seem to bleed off less than others. Why?
I've got no idea. Likely the dealer has gone over your system several times already and found nothing.
Reason being that it bleeds off so slowly that most leak detection equipment won't pick it up.
The most common leak area is from the front seal on the compressor. Replacing the seal or compressor is expensive and there's no guarantee that it will actually fix the problem. So, 'till someone comes up with a better refrigerant, or a way to make the system less prone to leaks, we're all pretty much stuck with it.

it is possibly cheaper to go to a glass firm and get glass cut and edges polished to fit than it would be to buy replacement shelves.the mark up is horrendous on any spare parts......