RS home standby display
4
Overcrank
Fuel · Shutdown
Fault code 4. Four blinks mean cranking time exceeded 35 seconds, which is the first-level overcrank indication. Do not read four blinks as code 44. The manual's cause list is a faulty switch, a faulty external start command, fuel supply, air-fuel mixture, exhaust, wire connections, starter, and ignition. The printed corrections are: open any closed fuel valves, secure the spark-plug leads, service the air filter, and replace the spark plugs. It then warns that some generator-set service can cause severe injury and belongs to trained people.
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
- Fuel valve closed or fuel not reaching the set.
- Spark-plug leads off, or plugs that the manual says to replace.
- Air filter, starter, ignition, wiring, or an external start command held in.
Checks an owner can do
- Open closed fuel valves.
- With the set off, push the spark-plug leads fully onto the plugs.
- If the air filter is visibly packed, service it the way the owner manual describes, engine off.
When to call a pro
The manual lists spark-plug replacement and then a safety warning. If you are not equipped for that, or code 4 remains, call a Cummins technician rather than cranking it further.
Source
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/4