Flow High
Your boiler is not detecting that a hot tap has been turned on, which is preventing it from heating your water.
Technical description: If the boiler is not lit when a hot tap is opened this could mean there is a lack of water flow or possible flow switch problem
Typical repair cost: £120-220 (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 Flow — no call-out fees, no surprises.
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Parts commonly replaced
- Flow switch
- Flow turbine
- Diverter valve diaphragm
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