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RDC2

Volts L1-L2 Low

Generator voltage low

Electrical · Shutdown

Shutdown. TP-7092: output voltage falls below 80 percent of nominal for more than 10 seconds. The printed check is to reduce the load and restart, check the enclosure thermostat and reset it if tripped, then contact a dealer. OnCue Plus names the related fault Generator Voltage AB Low.

Seen on: 14RCA, 14RCAL, 20RCA, 20RCAL, 26RCA, and 26RCAL sets with the RDC2 controller (TP-7092).

Likely causes

  • Load heavy enough to pull voltage under 80 percent.
  • Enclosure thermostat tripped.
  • A voltage-regulator or connection fault the table sends to the dealer.

Checks an owner can do

  1. Turn off large appliances, then restart once.
  2. If you can see the enclosure thermostat and the owner materials show a reset, reset it only after the set is cool. Do not open live electrical compartments.

When to call a pro

If voltage collapses again with the load reduced, stop and call a Kohler dealer.

Source

Kohler TP-7092 9/23e, Operation manual for 14/20/26RCA and RCAL residential generator sets with the RDC2 controller, fault-message table.

Wording follows that document. Firmware can change a threshold. If this page and the manual shipped with your unit disagree, follow the manual.

What fixed mine

No approved reports for this code yet. Send one. It stays in the review queue until it is approved.

Related Kohler codes

https://generatorcodes.com/brand/kohler/volts-l1-l2-low