My combi boiler works fine. I had an issue with the water pressure rising,and this was tested by the gas engineer. He charged the expansion vessel and water pressure was fine for few days.
Now a strange problem has come up. Heating and hot water is fine, but next to the pump there is a small black cap(i believe its called de-aerator) on a round small closed unit. Its leaking water from the top, not a lot but enough. Also the water pressure is rising again.
The engineer used a descaler for the heat exchanger. Could he have messed up something. Please point me to the right direction.
Now a strange problem has come up. Heating and hot water is fine, but next to the pump there is a small black cap(i believe its called de-aerator) on a round small closed unit. Its leaking water from the top, not a lot but enough. Also the water pressure is rising again.
The engineer used a descaler for the heat exchanger. Could he have messed up something. Please point me to the right direction.