High Lockout
Spare PCB Not Set on Ideal Logic Max Heat

Your boiler's computer brain has been replaced or reset and needs to be told which specific model it is controlling before it can start working.

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

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What causes this fault?

This fault occurs when a newly installed circuit board has not been configured to recognize the specific power output of your boiler. Because the same spare part is used across multiple models, the boiler remains in a safety mode until it is told exactly which version it is operating. This usually happens immediately after a repair or if the internal memory has been corrupted by a power surge.

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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