FD High
Your boiler has stopped heating because water is not moving through the system properly.
Technical description: No water flow
Typical repair cost: £100-£350 (including labour)
DIY fix possible
Check that your home's water pressure gauge is between 1 and 1.5 barOpen all radiator valves and ensure no radiators are blocked by airRestart the boiler by pressing the 'Reset' button
Protect yourself from future repair bills
A boiler cover plan would cover faults like FD — no call-out fees, no surprises.
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Parts commonly replaced
- Circulation pump
- Flow thermistor
- Main PCB
*Affiliate links — we may earn a commission at no extra cost to you.