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Hi , what happens when between those temperatures?
The radiators upstairs are warm but the downstairs radiators are cold.
The system has been drained, topped up and bled of air.
When not short cycling all seems well.
It is as if the boiler is OK but being instructed by a programme other than the usual thermostat / pump demand command.
Can I override this by using the plus and minus buttons somehow? I have not touched these buttons yet.
Hi , if you had been patient I could have helped you with this . we are not robots on the site 24 hrs a day. If you still need help then you will have to re rate me
Firstly Open all the radiator valves donstairs( both sides) fully and see if any there is a change.
The radiator valves are open.
I am new to this website so was disappointed that I was asked questions without a hint of a solution to my problem. When you have been cold for many days you don't feel charitable. I have rerated as requested to move things on. I will rerate later as warranted.
The system has been flushed with an anti sludge liquid by a plumber and the pump cleaned.
The plumber did say he thought that the heat exchanger may need replacing but this seemed more in desperation than logical analysis.
I don't think the plumber was expert in setting up the Vaillant ecotech 415 boiler because after two weeks of flushing and tinkering no progress was made and he left me with a system that provided little heat to the radiators although plenty of hot water.
The plumber is semi retired and no longer Gas Safe registered. I wonder if he has kept up to date with the technology.
I managed to get some radiator heat upstairs by studying responses to internet searches and finally managing to restart the boiler and avoid persistent F23 codes by gradually increasing the radiator max temperature over an hour to just over 70 degrees. This gave me some heat in the upstairs radiators but not downstairs.
I feel disloyal in saying the above because I have used the plumber for nearly 30 years but the boiler is only 7 years old and I need independent help.