HJ-08 Emergency
Your boiler has too much water pressure and needs some drained out to reach a safe operating level.
Technical description: High system pressure – the boiler needs to discharge water down to 0.8 bar
Typical repair cost: £0-120 (including labour)
DIY fix possible
Locate a radiator bleed valve and use a key to release water into a containerMonitor the boiler pressure gauge until it drops to between 1.0 and 1.5 barEnsure the filling loop valves are tightly closed so no more water enters the system
Protect yourself from future repair bills
A boiler cover plan would cover faults like HJ-08 — no call-out fees, no surprises.
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Parts commonly replaced
- Filling loop valve
- Expansion vessel
- Pressure relief valve
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