FS2
AquaCal
Water Outlet Temperature Sensor Fault
Display shows FS2; heater may shut down or refuse to start.
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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
Failed outlet thermistor, Loose sensor clip or poor thermal contact, Wiring harness damage, Corroded connector pins
How to Fix / Troubleshooting
Safety first: Turn off all power before accessing the control compartment.
- Locate FS2 sensor: Using the AquaCal schematic, find the outlet water sensor on the water manifold or outlet pipe.
- Check mounting: Ensure the sensor is properly inserted or clamped to the outlet location and not hanging loose.
- Inspect wiring: Look for nicks, crushed sections, or pulled‑out connectors. Repair or replace the harness as needed.
- Replace sensor: If FS2 persists after reseating connections, replace the outlet water temperature sensor with an AquaCal‑specified part.
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Repair Difficulty
Medium
3/5
Required Part
Outlet Water Temperature Sensor
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