Boiler Fault Code E83/E84/E85/E86/E87

Also written as E83E84E85E86E87 — same fault.

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

Fault code E83/E84/E85/E86/E87 appears across 1 boiler brand and 22 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's main control board has lost contact with the digital interface, meaning the internal components can no longer talk to each other to start the heating process. (As reported on Baxi Suprima 115)