BoilerFaultCodesWhat the manual says
Manufacturer manualNo flame signal after 4 ignition attempts (lockout) — gas tap closed; incorrect ignition distance; gas inlet pressure too low or disappears; gas valve or ignition unit not receiving voltage; condensate discharge blocked; gas valve set incorrectly. See TDS012 on atmos-i.co.uk for extended diagnostic.
From this model's manual
Verified against the Atmos/Atmos Interopen He22 installation & service manual, page 44.
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
All 25 fault codes on the Interopen HE22
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