0A16 High
Your boiler is struggling to heat up as quickly as it should, which suggests there is a problem with the water flow or a sensor inside the unit.
Technical description: Flow sensor temperature rise incorrect (time taken for flow temperature to rise is too long.
Typical repair cost: £120-350 (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 0A16 — no call-out fees, no surprises.
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Parts commonly replaced
- Flow NTC sensor
- Circulation pump
- Main heat exchanger
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