Boiler displays H07, may indicate a problem with the diverter valve or hot water priority.

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

Stuck diverter valve, Faulty diverter motor/actuator, Debris in diverter valve body

Safety first: Isolate power and water supply before working on the diverter valve. Allow system to cool.

Engineer steps:

Locate the diverter valve assembly (on combi models) and check for signs of leakage or corrosion.
Manually exercise the valve (if possible) to free it; if stiff or seized, replace the valve cartridge or complete assembly.
Test the diverter motor/actuator for correct operation and replace if not driving the valve.
Flush the system and fit a magnetic filter to reduce debris that can jam the valve.

Hard 4/5

Diverter Valve Assembly

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