Wolf
Unwanted Heating / Valve Bypass
Radiators get hot even when there is no call for 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
Stuck diverter valve allowing flow to heating, Motorised zone valve stuck open, Incorrect wiring causing permanent demand, Internal leak in diverter cartridge
How to Fix / Troubleshooting
Safety: Pipework may be hot even when the boiler appears off.
- Check controller demand: Confirm that the room thermostat and programmer are not calling for heat.
- Feel flow pipe: If the boiler flow pipe is hot while there is no demand, the boiler may be incorrectly receiving a call for heat.
- Inspect zone valves: Check the position indicators on motorised valves; if they show open when there is no demand, the valve may be stuck.
- Technician tasks: A heating engineer can test and replace the diverter valve, correct wiring, or replace faulty zone valves.
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Repair Difficulty
Medium
3/5
Required Part
Diverter Valve Assembly
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