D.84 Low
Your boiler is simply letting you know that it is due for its routine annual service soon.
Technical description: Maintenance indicator – number of hours until the next maintenance
Typical repair cost: £80-£120 (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 D.84 — no call-out fees, no surprises.
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Parts commonly replaced
- None (Standard service items only)
- Burner door seal
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