Troubleshooting

Boiler losing pressure

If your boiler pressure gauge keeps dropping, or the boiler locks out until it is topped up again, there is usually a fixable cause behind it.

Safe checks you can do

Turn the heating off and let the system cool before looking at anything.
Note the pressure reading on the gauge when the system is cold. Between 1 and 1.5 bar is normal.
Re-pressurise using the filling loop if the pressure is low, then watch the gauge over the next day.
Check for visible drips under radiators, at radiator valves and under the boiler.

Likely causes

A small leak somewhere in the system, often a radiator valve or joint.
A faulty pressure relief valve or expansion vessel inside the boiler.
Air that was released when bleeding radiators lowered the pressure.
A leaking expansion or filling loop that was left slightly open.

When to call Tignite

If you are re-pressurising more than once every few weeks, or the pressure drops within hours, stop topping up and call us. Repeated top-ups can hide a leak that gets worse over time.

Book an engineer

Prefer we handle it?

Not sure what is wrong, or would rather leave it to a professional? Our qualified engineers cover Chesterfield and the Peak District.

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