High
E25 on Baxi Promax Ultra

Your boiler has shut down because it is getting too hot too quickly, usually because the water isn't moving through the system properly.

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

Maximum temperature exceeded (possible pump failure or circulation blockage)

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.

Find a Gas Safe engineer
Search the official register →

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