What the manual says
Manufacturer manualOptional external safety sensor intervention - No continuity on external sensor circuit. Check link is present in external connections 14 and 15 or if fitted external safety device has activated
From this model's manual
Verified against the Alpha/Alpha Intec 50cs installation & service manual.
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 51 fault codes on the Intec² 26CE
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