E03 High
Your boiler has detected an issue with the sensor that monitors water movement, preventing the system from heating up properly.
Technical description: Flow sensor damaged
Typical repair cost: £125-£210 (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 E03 — no call-out fees, no surprises.
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Parts commonly replaced
- Flow sensor
- NTC thermistor
- Wiring harness
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