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Nexus
High Temperature
High temperature
Engine · Alarm
The Nexus high-temperature switch closes if temperature exceeds approximately 293°F (144°C) and shuts the engine down. The manual says the generator will restart and the LCD fault will reset once temperature is back in a safe range.
Seen on: Air-cooled generators with the Nexus controller covered by the Nexus diagnostic manual.
Likely causes
- Actual engine temperature above the switch point.
- A switch or wiring fault that closes the circuit early.
Checks an owner can do
- Let it cool before restarting. The manual's reset is temperature returning to a safe level, not a code to ignore while it is still hot.
- With the set cool, clear debris from enclosure inlet and outlet air paths.
When to call a pro
If it climbs straight back to a high-temperature shutdown, stop using it. The switch and cooling path need a technician.
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 Generac codes
https://generatorcodes.com/brand/generac/nexus-high-temperature