How much does it cost to fix boiler error code Test 1A?

Typical repair cost for the boiler Test 1A fault is £250-£450 including labour.

Test 1A High

Boiler Fault Code Test 1A

Also written as TEST1A — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Test 1A 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 has lost its display and controls, which usually means the main internal circuit board has failed while the pump is stuck in a backup safety mode. (As reported on Vokera Pinnacle)

Pick your boiler brand for the Test 1A fix

Vokera Test 1A 2 models

Source

Information for the Test 1A 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