central heating high pressure

[bobber-job]

Hi the water pressure in our central heating system was showing 3 bar, 4 hours after the boiler switched off. I have relieved some pressure using the valve on top of the Opticon gauge but it creeps back up to 3 bar when the boiler is running. not sure if this is connected but the oil boiler makes a loud pop every time it switches off. we also have issues with the boiler lock out light coming on. any thoughts please? thanks in advance

 

[Hot&Cold]

Tbh you need an onsite visit by an expert on your appliance

When was the appliance last serviced, it may not have been serviced to a decent standard but you have documents for that.

easy fix thou

 

[bobber-job]

thanks are you referring to the boiler or the central heating?