Worcester Bosch Inconsistent Domestic Hot Water Temperature

Hot water temperature fluctuates or runs hot then cold during use.

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

Scaled plate heat exchanger, Faulty DHW NTC sensor, Sticking diverter valve, Inadequate flow rate through boiler

Safety first: Risk of scalding from sudden hot water surges. Test water carefully.

Check flow rate: Ensure taps are not partially closed; very low flow can cause temperature swings.
Run one outlet at a time: Avoid running multiple hot taps simultaneously to reduce demand on the boiler.
Engineer tasks: A professional should descale or replace the plate heat exchanger, test the DHW NTC sensor, and check diverter valve operation.

Medium 3/5

Plate Heat Exchanger

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