Question about Zenith GE ZTX Series 100A Automatic Transfer Switch

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Generator available light rapid flashing

Ge zenith ztx-rm series       will not transfer back to utility

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Press the reset key(button) on the controller (asumming you have a R-M4 controller.) The R-M3 controller should have a reset button too.

Posted on Jan 27, 2009

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Why doesn't my GE Symphony 20kw generator turn off after the power comes back on?


The transfer switch could be bad, worn internally, a manual switch, or a semi-automatic transfer switch. Check the transfer switch part numbers and google them to find out exactly what kind they are. In some places fully automatic transfer switches are not permitted in a residential environment.

Dec 16, 2014 | Electrical Supplies

1 Answer

GE Generator 10kw model #040448. TRANSFER SWITCH FAULT message being displayed. Generator works fine. Generator output load voltage = 233V.


This generator has a built in transfer switch. If you do not have an external source of 240 volts going in to the unit (utility power), the transfer switch will show a fault or "abnormal" reading. If you do have utility power going in to the transfer switch, and the generator is on then you have a faulty transfer switch. It is time to warranty or get a replacement switch.

Sep 09, 2013 | Watts Onan Portable Generator - 5000 ,...

1 Answer

GE Generator model #040448: Transfer Switch Fault display


What model transfer switch do you have? Is it a GE or Zenith?

Sep 09, 2013 | GE Electrical Supplies

1 Answer

The green lights that normally shows utility power available are not lit despite having 240v all the way through to the house. I had to manually swich it off. Control panel???


Hi Scott,

If this is a newly installed Automatic Transfer Switch (or "ATS"), stop. Call the installer and have them get it working properly. You do not want to start poking around and potentially void the warranty.

If this ATS has been installed earlier and has worked as expected before, and this is the first failure, then we can rule out an improperly connected ATS. I have looked at the manual and see table 9 on page 15 shows a troubleshooting guide. The second condition speaks to the failure to return to utility power due to "T" timer, auto exerciser, or S1 (left-most green LED) power quality / presence issue. It is this last S1 indicator that seems to be the issue. If it is not working, the other green LED (S2) will not light as the ATS will not close the contacts between the Utility and Load. This tends to make me believe the problem lies within the control panel as it is responsible for sensing not only utility power, but performs the synchronization or timing of the transfer of the load from one system or the other. This is needed as generator power is unstable until the generator speed has come up to speed and remains constant. Likewise, the utility sees a huge load when they restore lost power and this can cause some odd waveforms - those that most electronics do not like. Either way, they are power quality issues. Since they are two different systems, it is highly unlikely that they are synchronized. The controller helps to minimize the mismatched waveforms for a smooth transition.

This is a job for qualified personnel. You need to be careful as this system when shut down, might automatically start the generator. If you can't hear it - the potential for shock, burns or even death is present. Be careful - or better yet, call an electrician or the company that performed the installation.

Good luck!

Aug 30, 2011 | Zenith GE ZTX Series 200A Automatic...

1 Answer

What are some the problem if transfer switch dose not transfer when genarator cut in?


If the transfer switch is wired correctly, but for some reason it fails to switch over, even though the generator starts, this will not cause a problem or a safety issue. It will simply mean that no power from the generator goes to the house, and your house will still be connected to the utility company line. The generator will continue to run, but only with enough power to keep itself running at the proper speed. It will have no load on it, which is the same thing that would happen if everything in your house was turned off.

May 20, 2010 | Zenith GE ZTX Series 200A Automatic...

1 Answer

Series165 Automatic Transfer Switch with faulty controller


You have a faulty component in the controls somewhere. Sometimes you can find it by unhooking things, then try powering up until it stays on. Then you isolate it down by gradually hooking things back up until your problem comes back.

Jun 20, 2009 | RTO ASCO 165 Series 200A Automatic...

2 Answers

Zenith ZTX transfer switch, three phase 150 amp


if the s2 and load are flashing every couple of seconds that means your exerciser is set.

Oct 03, 2008 | Zenith ZTG Nema-3R, 400 Amps Three Phase,...

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