Your boiler has stopped because the water pressure inside the system has dropped too low to operate safely.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: No water in the primary circuit
DIY fix possible
Locate the filling loop (usually a silver braided hose with one or two valves underneath the boiler).Slowly open the valve(s) to allow mains water into the system until the pressure gauge on the front reads between 1.0 and 1.5 bar.Close the valve(s) tightly and restart the boiler.
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Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like 08 — no call-out fees, no surprises.
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Chaffoteaux Calydra 100 is discontinued — time for a new one?
Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
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