Question about Generac Guardian 100 Amp Transfer Switch with Service Disconnect NEMA 3R

2 Answers

Transfer switch will not switch back to utility

This morning I heard the standby generator running at my shop. We have had no power outage so I went to investigate. I found the transfer switch in the generator position. Proper utility power was present at the main panel and into the transfer switch. When I tried to manually transfer it back it sounded like it was shorting out and would not go back to utility. When I turned the breaker off at the generator I was able to switch it to utility but as soon as I turned the breaker back on (at the generator) the transfer switch went back to generator. While it is in generator mode everything worked correctly, as it did in utility mode. The unit is a 7 kw generac guardian with the supplied 100 amp transfer switch. It is about 2-3 years old and has never experienced a problem before. There is no obvious damage inside the transfer switch. I have looked for a troubleshooting guide and schematic but have not had any success yet. I also have a generator on one of my restaurants (60 kw) and this same thing happened and I had to replace the switch. I'm hoping its something as simple as a relay, that is why I have presented my question here. Thank you in advance, Walter Wiseman

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I do not have its schematics but theory says circuit which is responsible to energize relay up to utility supply is not working and auto switch shift to generator mode.

I would recommend to replace it as well because its sensitive part and hard to repair.

Thank you

Posted on Dec 25, 2008

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  • 327 Answers

Its the problem of the switch and it has to be replace in such cases to make it proper.it is necessary to replace the switch.

Posted on Dec 25, 2008

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1 Answer

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http://www.homegeneratorsystems.com/service_support/manuals/index.cfm?rd=1

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Setting Exercise Timer
The Home Standby Generator is equipped with an exercise
timer that will start and exercise the system once every
seven days. During this exercise period, the unit runs for
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load transfer DOES NOT occur during the exercise cycle
(unless an utility power outage occurs).
A switch on the control panel is labeled “Set Exercise”
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Standby Generator to exercise.
2. On that day and time, set the AUTO/OFF/MANUAL
switch to OFF.
3. Press and hold down the “Set Exercise” switch for two
seconds.
4. Set the AUTO/OFF/MANUAL switch to AUTO.“Set
Exercise” is complete.
For example, if you press the “Set Exercise” switch on
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cycle the following Sunday at 10:00 AM (+/- 1/2 hour).
NOTE: “Set Exercise” will only work if the unit is in the
Automatic mode and this exact procedure is followed.The
exerciser does not need to be re-set if the 15 Amp fuse is
removed or changed.The exerciser will need to be re-set if
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If you want to change the day and time the unit exercises,
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weekday and time you want it to take place.
• To prevent possible injury that might be caused by such sudden
starts, always set the AUTO/OFF/MANUAL switch to OFF.
• Remove the 15 Amp fuse before working on or around the
generator or transfer switch.

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