High
Communication fault on Vaillant ecoTEC Pro 30

Your boiler's internal computer is unable to talk to its display panel, meaning the system has stopped working to protect itself.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description

No communication with the PCB Communication fault between display and PCB in the electronics box

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Related fault codes

F.70View →F.71View →

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