ACV Reduced DHW Flow Rate

Boiler runs but hot water flow is weak compared to cold 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

Blocked DHW plate heat exchanger, Blocked inlet filter, Partially closed service valve, Limescale in pipework

Safety first: Water may be hot; open taps carefully.

Compare taps: Check multiple hot taps. If all are weak but cold is strong, the restriction is likely near the boiler.
Check service valves: Ensure the cold inlet and hot outlet service valves at the ACV boiler are fully open.
Clean aerators: Remove and clean tap aerators and shower heads.
Professional cleaning: A technician should clean the cold inlet filter and descale or replace the DHW plate heat exchanger.

Medium 3/5

DHW Plate Heat Exchanger

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