T6 High
Your boiler has detected an internal safety electronic error and has stopped working to prevent a malfunction.
Technical description: Ionisation oscillator test
Typical repair cost: £180-£450 (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 T6 — no call-out fees, no surprises.
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Parts commonly replaced
- Printed Circuit Board (PCB)
- Internal Wiring Harness
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