E091 Medium
Your boiler has detected that the main part responsible for heating your water is becoming blocked or dirty and needs a professional service.
Technical description: Clean primary heat exchanger
Typical repair cost: £100-250 (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 E091 — no call-out fees, no surprises.
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Parts commonly replaced
- Heat exchanger cleaning fluid
- Heat exchanger seals
- Primary heat exchanger
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