E4
Senville
Outdoor Discharge Pipe Temperature Sensor (T3) Fault
Indoor unit shows E4; unit may stop during heating or defrost cycles, or not enter defrost properly.
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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 shorted discharge pipe sensor, Loose sensor connection on outdoor PCB, Sensor dislodged from discharge line, Faulty outdoor main control board (PCB)
How to Fix / Troubleshooting
Safety: Turn off power at the breaker and outdoor disconnect before servicing.
- Step 1 – Access discharge sensor: Remove the outdoor unit service panel. Locate the sensor clipped or strapped to the compressor discharge line (small copper line leaving the compressor).
- Step 2 – Inspect sensor and wiring: Look for burn marks, melted insulation, or physical damage. Ensure the sensor is tightly attached to the pipe.
- Step 3 – Check connector: Follow the sensor wires to the PCB and reseat the connector. Clean any corrosion with electrical contact cleaner.
- Step 4 – Replace sensor: If the sensor is damaged or E4 persists, install a new Senville discharge pipe sensor. Use thermal paste or the supplied clip/strap to ensure good contact with the pipe.
- Step 5 – Test operation: Restore power and run the unit in heating mode. Monitor for normal operation and absence of E4.
- Step 6 – Board diagnosis: If E4 remains with a new sensor, the outdoor PCB may be defective and should be replaced by a qualified technician.
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Repair Difficulty
Medium
3/5
Required Part
Discharge Pipe Temperature Sensor (T3)
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