Remeha No DHW production

Boiler runs for heating but there is no domestic hot water on a combi model

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.

Possible Causes

Faulty DHW flow sensor, Blocked plate heat exchanger, Stuck diverter valve, DHW NTC sensor failure

Safety first: Water may suddenly become hot during testing. Take care at taps and showers.

Check boiler display: When a hot tap is opened, the boiler should show a DHW demand symbol. If not, the flow sensor may not be detecting flow.
Test multiple taps: Confirm the issue is present at all hot outlets.
Engineer tasks: Test and replace the DHW flow sensor, inspect and free or replace the diverter valve, clean or replace the plate heat exchanger, and verify DHW sensor operation.

Hard 4/5

Diverter Valve

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