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RS home standby display

1

High engine temperature (one blink)

Engine · Shutdown

First-level blink, not a second-level two-digit code. The RS20 manual says one blink is a shutdown for high engine temperature. It also warns that fault codes 1, 2, 3, and 4 are first-level faults: watch the pause so you do not read one blink as code 11. The manual does not print a separate 'Fault Code 1' cause list in section 5.4, so no extra causes are added here.

Seen on: Cummins RS-series home standby sets covered by the RS20 operator manual. QuietConnect RS13A–RS20AC operator manual A053X174 repeats these fault code numbers.

Likely causes

  • High engine temperature, reported as a single blink.

Checks an owner can do

  1. Count the blinks and the pause before you assume a two-digit code.
  2. Let the set cool. Do not clear it and immediately reload the house.

When to call a pro

The manual does not give an owner repair for the one-blink temperature shutdown in the fault-code chapter. A Cummins technician should find why it overheated.

Source

Cummins RS20 home standby operator manual, section 5 (fault codes and blink pattern). The same code numbers are listed in operator manual A053X174 for the RS13A, RS17A, RS20A, and RS20AC QuietConnect sets.

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 Cummins codes

https://generatorcodes.com/brand/cummins/1