E029
Perkins
Coolant Temperature Sensor Circuit Fault
Perkins generator controller shows E029 and indicates coolant temperature sensor fault
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Open or short circuit in sensor wiring, Failed coolant temperature sensor, Corroded connector at sensor or ECU
How to Fix / Troubleshooting
Safety: Allow engine to cool before handling the sensor to avoid burns.
- Check wiring continuity: With power off, measure resistance between sensor connector and ECU/controller pins. Repair any open or shorted wires.
- Inspect connector: Look for green corrosion, bent pins, or moisture. Clean and dry thoroughly.
- Sensor resistance test: Remove the sensor and measure resistance at known temperatures (e.g., room temperature). Compare to Perkins specifications.
- Replace sensor: If readings are out of range, install a new coolant temperature sensor and refill/bleed coolant if necessary.
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Repair Difficulty
Medium
3/5
Required Part
Coolant Temperature Sensor
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