Intergas Diverter Valve Stuck in DHW Position

Boiler runs for hot water but central heating only works when a hot tap is opened (on combi models)

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

Sticking diverter valve, Faulty diverter motor, Debris in diverter mechanism, PCB control fault

Warning: Diverter valve access is internal. Only a qualified engineer should dismantle it.

Confirm symptom: Turn on heating and wait. If radiators stay cold but briefly warm when a hot tap is opened, the diverter is likely stuck.
Avoid forcing operation: Do not repeatedly open and close taps to 'force' heating; this stresses the boiler.
Engineer tasks: The engineer will inspect the diverter valve assembly, clean or replace the valve cartridge, and test the diverter motor and PCB outputs.

Hard 4/5

Diverter Valve Assembly

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