Weishaupt
Diverter Valve Stuck / DHW Priority Failure
On combi models, central heating works but there is no domestic hot water.
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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 motor, Scale or debris in diverter body, Faulty diverter position sensor, DHW flow sensor not triggering valve movement
How to Fix / Troubleshooting
Safety: Isolate power and close water valves before removing any hydraulic components.
- Check DHW demand: Confirm that the Weishaupt display shows a DHW demand symbol when a hot tap is opened. If not, troubleshoot the flow sensor first.
- Listen for valve movement: When a hot tap is opened, you should hear the diverter valve motor move. If silent, the motor or control signal may be faulty.
- Exercise valve: A technician can remove the motor head and manually move the valve spindle to free it if stuck, then flush the system.
- Replace diverter: If the valve body is scaled or leaking, replace the complete diverter valve assembly.
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Repair Difficulty
Hard
4/5
Required Part
Diverter Valve Assembly
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