I had to drain down the hot water to fix a leaking isolation valve. It's an open vented system with an oil boiler.
All outlets were spluttering afetrwards. The mixer taps were easily fixed by covering and forcing the cold water up the hot. There is a downstairs bath with a mixer that was difficult. Tried it a dozen times and finally after covering for 3 minutes forcing the cold water up the hot it seems to be OK now.
But upstairs theres a thermostatic mixer shower (with a separate pump) that is still air locked. The pressure goes up and down when in use. I tried turning off the pump and then removed the shower head and covered the end and turned on to try to get the cold to flow up the hot pipe. I did this for 12 minutes and it makes no difference. I think the shower must be preventing the cold flowing up the hot.
Any advice?
All outlets were spluttering afetrwards. The mixer taps were easily fixed by covering and forcing the cold water up the hot. There is a downstairs bath with a mixer that was difficult. Tried it a dozen times and finally after covering for 3 minutes forcing the cold water up the hot it seems to be OK now.
But upstairs theres a thermostatic mixer shower (with a separate pump) that is still air locked. The pressure goes up and down when in use. I tried turning off the pump and then removed the shower head and covered the end and turned on to try to get the cold to flow up the hot pipe. I did this for 12 minutes and it makes no difference. I think the shower must be preventing the cold flowing up the hot.
Any advice?