Crown Chronic Pressure Loss

Boiler frequently loses pressure and requires topping up.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Hidden leak in system piping, a leaking automatic air vent, a faulty expansion tank, or a relief valve weeping at a low rate.

Safety: Do not overfill the system. Monitor the pressure carefully while adding water.

Inspect for visible leaks: Check all accessible piping, radiators, and the Crown boiler for any signs of water leakage.
Check air vents: Inspect automatic air vents on the boiler and near high points for signs of staining or moisture.
Monitor relief valve: Place a container under the relief valve discharge and check over a day or two for intermittent dripping.
Expansion tank: A failed expansion tank can cause significant pressure swings and relief valve discharge. Have a technician test and replace it if necessary.

Medium 3/5

Automatic Air Vent

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