F10 appears and heater shuts down; may occur during long run cycles.

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.

Possible Causes

Failed inlet thermistor, Wiring damage near manifold, Sensor reading out of range due to scale or air pockets

Safety first: Turn off power and allow the heater to cool.

Inspect inlet sensor: Locate the inlet water sensor on the manifold. Check for physical damage or loose wiring.
Check for air and scale: Air pockets or heavy scale can cause abnormal temperature readings. Bleed air from the system and ensure the filter and heater are properly maintained.
Sensor replacement: If wiring is intact and F10 persists, replace the inlet sensor. Use thread sealant approved for potable water and avoid overtightening.

Medium 3/5

Inlet Water Temperature Sensor

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