Vokera No Domestic Hot Water on Combi Boiler

Boiler runs for central heating but does not provide any hot water at the taps

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 or switch, Blocked DHW inlet filter, Stuck diverter valve, Faulty DHW NTC

Safety first: Isolate cold water supply before removing any DHW components.

Check demand recognition: Open a hot tap and watch the boiler display; if it does not show a DHW demand symbol, the flow sensor/switch may be faulty.
Engineer tasks:
- Clean the DHW inlet filter on the Vokera boiler.
- Test and replace the DHW flow sensor or microswitch.
- Inspect and free or replace the diverter valve if stuck in heating position.

Do not attempt to dismantle the diverter valve without draining and isolating the boiler.

Hard 4/5

Diverter Valve Assembly

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