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

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Generac Guardian 15kW Generator

When a power failure occured my generator failed to perform an automatic transfer to generator power. The unit started up and was running fine but the automatic transfer switch (ATS) in the load center failed to transfer power over. We had to open up the load center and manually switch the ATS.

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  • jstegall Jan 20, 2009

    Measured the voltage at Terminal Strip in the load center between wire 23 and 194 and found that the 12vdc ground was missing. The control printed circuit board in the generator was found to be defective. Performed aditional test and found the relay RL3 was defective. The relay would switch on and off but the contacts had corrosion that prevented the circuit from operating properly. Ordered a replacement relay from Newark electronics for $1.30 and fix the problem.

  • jstegall Jan 20, 2009

    Measured the voltage at Terminal Strip in the load center between wire 23 and 194 and found that the 12vdc ground was missing. The control printed circuit board in the generator was found to be defective. Performed aditional test and found the relay RL3 was defective. The relay would switch on and off but the contacts had corrosion that prevented the circuit from operating properly. Ordered a replacement relay from Newark electronics for $1.30 and fix the problem.

  • Anonymous Mar 11, 2014

    Setting the time on my Invicta Subaqua Noma IV 1157 watch

  • Anonymous Mar 12, 2014

    Unit runs fine but shuts down when idle control switch is turned on

  • Anonymous Mar 12, 2014

    Unit runs fine but shuts down when the idle control switch is turned on.

  • Anonymous Mar 21, 2014

    On a pramac gb 15 generator put switch to automatic test and generator trys to start but doesnt

  • Anonymous Mar 30, 2014

    "Generac 14 kW guardian standby . Installed for almost 4 years. No problems
    The unit has a blank(unreadable) control screen, and will not start on demand(automatic) when loss of power. The unit will start in the manual mode. Where do I look next?"

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  • 169 Answers

That sounds just about right, if the relay contacts get welded together it sometimes takes out the driver on the printed circuit board. As you found out, 12vdc from 23 to 194 makes the transfer switch move to the Generator position, relay not energized makes the ATS move to the Normal position.

You can make a nice test function by installing a 10 amp contact switch in series with either the N1 or N2 terminals. When the switch is open the generator thinks the Normal power has failed.

Regards,
Carl

Posted on Jan 26, 2009

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