Boiler shows A11, burner stops, display may indicate return temperature too high

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

Insufficient system flow, Closed valves or blocked strainers, Pump running at too low speed, Incorrect hydraulic balancing

Safety: Components may be hot. Allow cooling before handling.

Check valves: Ensure all isolation valves on the boiler and nearby pipework are fully open.
Clean strainers: Many Hoval systems include Y-strainers on the return. Isolate, depressurise, and clean the strainer basket of sludge and debris.
Adjust pump: Increase the circulation pump speed or set it to automatic adaptive mode if available.
System balancing: If some circuits are over-restricted, a heating engineer should rebalance the system to ensure adequate flow through the boiler.

Medium 3/5

Circulation Pump

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