BoilerFaultCodesYour boiler is struggling to heat your hot water tank because it cannot detect or communicate with a required external sensor or control module.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Without auxiliary function for DHW loading
What causes this fault?
This fault occurs when the boiler's control system loses its connection to the sensor responsible for monitoring your hot water cylinder. The most common cause is a faulty temperature probe or a break in the wiring that prevents the boiler from knowing how hot your water is. Without this information, the boiler stops heating the water as a safety precaution to prevent overheating.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
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A boiler cover plan would cover faults like 58:0 — no call-out fees, no surprises.
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Could it be time for a new boiler?
If repair costs are adding up, a new energy-efficient boiler could be the smarter long-term choice.
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