Worcester Bosch
Hot water control configuration fault
Thermostat fails to control domestic hot water schedule on a system where it should.
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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
Hot water control disabled in settings, Cylinder sensor not detected, Incorrect wiring to hot water valve, Incompatible boiler mode
How to Fix / Troubleshooting
Safety first: Hot water valves and wiring are mains‑powered; isolate power before inspection.
- Check configuration: In the thermostat or controller, ensure 'Hot Water Control' is enabled and schedules are set.
- Wiring verification: Confirm that the controller's hot water output is wired to the cylinder zone valve or boiler hot water input.
- Cylinder sensor: If using a Worcester Bosch cylinder sensor, ensure it is connected and reading a plausible temperature.
- If still no control: A heating engineer should test the hot water valve actuator and controller output.
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Repair Difficulty
Hard
4/5
Required Part
Hot Water Zone Valve Actuator
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