EH 258 High
Your boiler's internal computer or control module has developed a fault and can no longer communicate with the rest of the system.
Technical description: Control box or the heat control module (HCM) is defective – HCM or control box connections need to be checked
Typical repair cost: £280-550 (including labour)
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Protect yourself from future repair bills
A boiler cover plan would cover faults like EH 258 — no call-out fees, no surprises.
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Parts commonly replaced
- Heat Control Module (HCM)
- Main Printed Circuit Board (PCB)
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