E78 High
Your boiler's internal sensor is struggling to accurately read the water pressure, which prevents the system from operating safely.
Technical description: Water pressure sensor fault
Typical repair cost: £120-190 (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 E78 — no call-out fees, no surprises.
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Parts commonly replaced
- Water pressure sensor
- Sensor wiring harness
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