How much does it cost to fix boiler error code Er.16?

Typical repair cost for the boiler Er.16 fault is £200-450 including labour.

Er.16 High

Boiler Fault Code Er.16

Also written as ER16 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Er.16 appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is struggling to exchange heat effectively to provide hot water, which may cause your hot tap water to run cold or the system to stop working entirely. (As reported on Vaillant Thermocompact)

Pick your boiler brand for the Er.16 fix

Vaillant Er.16 2 models

Source

Information for the Er.16 fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026