Your boiler has detected that the internal water pressure or the amount of water inside the unit is insufficient for it 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: Water level control
DIY fix possible
Check your system pressure gauge to see if it is below 1 bar.Locate the external filling loop connected to your boiler pipework.Slowly open the valve to let water in until the pressure reaches 1.5 bar, then ensure it is fully closed.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like 18-19 — no call-out fees, no surprises.
Affiliate links — we may earn a commission at no extra cost to you.
Remeha Quinta 30 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.
Affiliate links — we may earn a commission at no extra cost to you.