BoilerFaultCodes b43 High
The internal computer settings for your boiler have been altered, causing the system to stop working because it no longer knows how to run safely.
Call an engineer soon
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: One or several adjusted parameters out of range including some factory defaults which should not have been changed.
Typical repair cost £120-250 (including labour)
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Search the official register for a qualified engineer in your area.
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A boiler cover plan would cover faults like b43 — no call-out fees, no surprises.
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