E54 Medium
The boiler is struggling to detect when you turn on a hot tap, which may result in lukewarm water or no hot water at all.
Technical description: Domestic hot water (DHW) flow sensor fault
Typical repair cost: £120-210 (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 E54 — no call-out fees, no surprises.
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Parts commonly replaced
- DHW flow sensor
- Flow turbine
- Wiring harness
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