A few weeks ago we had a new kitchen sink fitted. Immediately afterwards the cold water tank in attic started overflowing. Fitted new ballvalve but did not help.
We have had 2 plumbers look at the problem and they do not know what the problem is.
We do not have central heating so the cold water tank in the attic just feeds the immersion heater.
Overflow pours out even when immersion heater is off and water is cold.
When the new sink was fitted they did not go into attic at all, just turned off cold water supply under sink and in the airing cupboard above the immersion heater.
The cold water tank in attic is filling despite the ballvalve being new and working fine.
Does anyone have any ideas as to how we can fix this?
We have had 2 plumbers look at the problem and they do not know what the problem is.
We do not have central heating so the cold water tank in the attic just feeds the immersion heater.
Overflow pours out even when immersion heater is off and water is cold.
When the new sink was fitted they did not go into attic at all, just turned off cold water supply under sink and in the airing cupboard above the immersion heater.
The cold water tank in attic is filling despite the ballvalve being new and working fine.
Does anyone have any ideas as to how we can fix this?