High
F.184 on Viessmann Vitodens 222-F B2TF

Your boiler has identified an electrical fault with its temperature monitoring system and has shut down as a safety precaution to prevent overheating.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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.

What the manual says

Manufacturer manual

Short circuit, flow temperature sensor/high limit safety cut-out

From this model's manual
Verified against the Viessmann Vitodens 222 F B2tf installation & service manual, page 94.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the 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

F.164View →F.182View →F.185View →

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