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RS home standby display

2

Low oil pressure

Engine · Shutdown

Fault code 2, and two blinks as a first-level shutdown. The RS20 manual's causes are oil level too low or too high, a faulty switch, a faulty oil-pressure relief valve, or a faulty oil pump. The corrective step it gives the reader is to check the oil level and add or drain oil as necessary. The status light's two blinks mean loss of engine oil pressure. Do not confuse that pause pattern with code 22.

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

  • Oil level too low or too high.
  • Faulty oil-pressure switch.
  • Faulty relief valve or oil pump.

Checks an owner can do

  1. Engine off and level: read the dipstick. Add or drain oil so it sits in the marked range.
  2. Look for a fresh leak. Do not run it to see if the light goes out.

When to call a pro

If the level is right and code 2 returns, the switch, relief valve, or pump is the manual's next list, and those are not owner parts to guess at. The manual's service warning applies.

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/2