What the manual says
Manufacturer manualFan frost protection function active: Fan speed outside the tolerance values - Plug on fan not correctly plugged in, multiple plug on PCB not correctly plugged in, break in cable harness, fan blocked, Hall sensor defective, electronics defective
From this model's manual
Verified against the Vaillant/Vaillant Home Regular Installation And Maintenance installation & service manual.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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All 33 fault codes on the Home Regular 12
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