03E High
The boiler's internal sensor that monitors water temperature or flow has failed, meaning the system cannot safely regulate heat.
Technical description: Flow sensor damaged
Typical repair cost: £120-220 (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 03E — no call-out fees, no surprises.
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Parts commonly replaced
- Flow NTC Thermistor
- Flow Sensor Wiring Harness
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