E154 High
Your boiler has detected that water is circulting poorly or heating up too quickly, causing the temperature sensors to provide unusual readings.
Technical description: Flow/return sensor temperature test
Typical repair cost: £120-£280 (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 E154 — no call-out fees, no surprises.
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Parts commonly replaced
- Flow Temperature Sensor
- Return Temperature Sensor
- Circulation Pump
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