H07 Medium
Your boiler has detected that the water pressure in the system is too low, causing it to reduce its output or stop working to prevent damage.
Technical description: The current water pressure is too low, limiting the performance in heat mode as well as domestic hot water (DHW) mode
Typical repair cost: £0-120 (including labour)
DIY fix possible
Locate the external filling loop, which is usually a silver flexible hose beneath or near the boiler.Open the one or two taps on the filling loop slowly until you hear water entering the system.Monitor the pressure gauge on the boiler front or digital display and close the taps once it reaches 1.5 bar.
Protect yourself from future repair bills
A boiler cover plan would cover faults like H07 — no call-out fees, no surprises.
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Parts commonly replaced
- Filling loop valve
- Pressure sensor
- Expansion vessel
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