IBC
No Domestic Hot Water Production
Boiler display shows normal operation but there is no hot water at taps on a combi model.
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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
DHW flow sensor not detecting flow, Blocked cold inlet filter, 3-way diverter valve stuck in heating position, DHW plate heat exchanger blocked
How to Fix / Troubleshooting
Safety: Turn off power and close water valves before servicing DHW components.
- Check DHW demand: Open a hot tap and watch the boiler display. If it does not indicate DHW mode, the flow sensor or wiring may be faulty.
- Clean inlet filter: Remove and clean the cold water inlet filter screen.
- Diverter valve: If the boiler shows DHW mode but radiators get hot instead of taps, the internal 3-way valve may be stuck and requires service.
Persistent DHW failure requires a technician to test the flow sensor, diverter valve actuator, and plate heat exchanger.
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Repair Difficulty
Hard
4/5
Required Part
3-Way Diverter Valve
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