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Morning Update. Some of the air seems to have settled out overnight and the boiler will now run without the overheat shut-off operating. I seem to be more or less back to where I started: With hot water and heating on, some upstairs radiators warm up, but downstairs is cold. With the water...

The trouble was that the lever would not work and had not affect upon anything. Anyway, I have now drained the system, replaced the valve that I messed up and checked the pump for blockages. All was clear, but now I cannot get the air out of the system, as usual, and the boiler keeps cutting...

Through my own cack-handedness, I think that I am going to have to replace the head and may as well do the lot. When I took the head off, the spring pulled the innards to rest. When trying to replace the head, I used the manual level to align the motor with the valve itself, caused something...

As is only to be expected, the system was just the same this morning. I have not drained the system yet, but did take the head off from the diverter valve to see whether or not the actual valve was turning. I do not know how far it should move, but when turning the shaft of the valve, it...

Thank you for the clarification about balancing the flow to the hot water tank. I will dig out a thermometer to check the heat through. I did realise that the inhibitor goes in right at the end, but thank you for checking. Regards, James.

Ian, On reflection, I shall see what the system does in the morning, just in case my fiddling with the valve has done anything. Assuming that it has not, then I shall drain the system, remove the pump and check for any blockages. I shall also have a look at the valve to make sure that it is...

Ian, Thank you for the detailed guidance. You are right: the wiring has not been touched. With the cover off the valve, I can see the motor, but there is a nylon collar that blocks the actual valve from view. However, setting the thermostats as you advise does seem to move the valve...

Ian, Thank you for your reply. The problem all started last winter when I replaced the pump. It was definitely faulty as it was making an awful grinding noise and the heating was inefficient. However, it may also have been masking a fault elsewhere in the system. It is a three-way valve...

Bother. I spoke to soon. Starting from fresh this morning with the valve into the heating coil almost shut, the radiators downstairs were tepid and those upstairs only marginally warmer. I turned off the hot water and all all of the radiators heated up quickly and remained hot when I turned...

"If you had said you had moved the setting on the HW balancing valve" To be honest, I had completly forgotten until I read the comments on here about balancing the two systems. Again, thank you all for your suggestions. I have just come back in from outside and it is like toast in here...

Thank you all for your replies and the clarification about head. Zone valve: I regret that I can find no other numbers on it. I did a search on the web, but could not find anything useful there on it either. Pump setting. I have tried all three speed settings, but with no discernible...

Would a pump that is not powerful enough cause the same symptoms? The problem only started when I fitted the new pump after the old one failed. The new one is not the same as the old one. Out of interest, is the head of the pump the height from the pump to the highest point or the vertical...

Can anyone help? My hotwater heats properly, but the radiators take a very long time to warm up and rarely get properly hot. They have been bled and the pump is new (the old one failed). If I turn the hotwater off on the timer so that just the heating is on, the radiators heat up quickly...

The old pump was making a loud din and vibrating. I cannot remember what specification it was, although I think that it was a Grundfos. The new pump has three speed settings, but it makes no difference which I use. I have a nagging suspiscion that the old pump was a 15-60, but I cannot be sure...

Last winter, I replaced our worn-out heating pump, but the downstairs radiators have not been heating up properly ever since. All was well with the system originally, but now half of the radiators downstairs will only warm up if I turn off two of the bedroom radiators. Once the downstairs...

I turned it up from 1 to 2 this morning. It worked properly this evening, so fingers crossed. Regards, James.

No, I did not realise. I naively assumed that you just poured in it and then drained out the system. Mind you, I have yet to buy any or look at the instructions. The heating was off again this morning, even though it worked last night. Again, I turned off the hot water for a while when I got...

Quite simply, I am not very quick working on plumbing. If the system keeps going until the summer, I can take my time over the job and not have to rush because the house is getting cold. If the heating keeps playing up, then I will just have to get on with it now. Regards, James.

Thank you for the replies. I do hope that the pump is not defective as the isolator valves for the pump leak and I get water everywhere unless I drain the system. I tried a little balancing, but as so many of the radiator valves are old and jammed, this is hard. How do I balance the hot...

Can anyone please help? We have a Potterton Profile 60e. A new pump was fitted a couple of weeks ago as the old one was making an awful din. The heating was fine until the last few days. Now, our heating has started to play up. The hot water works fine, but the radiators do not heat up...