E154 High
Your boiler has detected that the water is circulating or heating up incorrectly, likely due to a pump issue or a blockage.
Technical description: Flow/return sensor temperature test.
Typical repair cost: £150-350 (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.
*Affiliate links — we may earn a commission at no extra cost to you. Prices shown are starting prices.
Parts commonly replaced
- Circulation Pump
- Flow Temperature Sensor
- Return Temperature Sensor
*Affiliate links — we may earn a commission at no extra cost to you.