BoilerFaultCodes 516 Medium
Boiler Fault Code 516
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 516 appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has lost communication with the temperature sensor located outside your home, so it cannot automatically adjust your heating based on the weather. (As reported on Ideal Logic Air)
Pick your boiler brand for the 516 fix
Source
Information for the 516 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 7 July 2026