E17
BWT
Refrigerant Discharge Temperature Too High
Heater shows E17; unit may start but quickly stops heating
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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
Low water flow through heat exchanger, Dirty air coil reducing heat rejection, Overcharged refrigerant, Faulty discharge temperature sensor
How to Fix / Troubleshooting
Safety first: Turn off power before cleaning or accessing sensors.
- Check water flow: Ensure all valves are open, filters are clean, and the pump is operating correctly. Low flow can cause high discharge temperatures.
- Clean air coil: Remove debris from the outdoor coil to improve heat rejection.
- Inspect discharge sensor: Locate the discharge temperature sensor on the compressor discharge line. Check that it is firmly attached and that wiring is intact.
- Restart and observe: After cleaning and verifying flow, restart the heater and monitor operation. If E17 recurs, a refrigeration technician should check system pressures and refrigerant charge.
Do not attempt to adjust refrigerant charge yourself. High discharge temperature issues must be handled by a certified technician.
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Repair Difficulty
Hard
4/5
Required Part
BWT Discharge Line Temperature Sensor
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