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Sorry what do you mean by Acid test? Anyway, there is hot water. Will it makes any difference if I power flush it?

I got it going. I felt the return pipe by the boiler is warm. However, the boiler switches off by itself even though I got the control on.

Ooh no. The boiler dies down again but this time I could feel the heat at the expansion pipe. The flow by the cylinder is really hot and on return it colder slightly colder, however, the return by the boiler is cold.

After doing so (above video) I turned on (boost) the HW. No result by just pumping air via expansion pipe :( I looked in the airing cupboard again and realized that the air could happily go through the cylinder and makes its way up to the tank. So, I blocked the flow from the tank and pumped...

I pumped air via expansion pipe. Air return in the tank constantly. Does this mean anything? If there is a block I won't get any air return, is that right?

The boiler doesn't shut off on CH & HW (just that HW circuits doesn't get heated). This system is such as, HW will be on as CH is on. CH can't run on its own. BTW it's good to know that boiler is not the issues. I read somewhere that someone suggested turning the pump around. Will this create...

Did this, however still the same boiler fired up for 3mins and dies down. Next will try to fill it reverse.

No, i have not. THis would be one of my next options. Should drain the system before reverse fill?

My toilet radiator seized on the return valves, so only did the flow valves and it sprayed the same. I fired the boiler up (HW), in about 5mins it dies down. I feel the flow pipe in the boiler room and the heat goes up almost to the top celling. Checked the airing cupboard no pipe get warm...

Sorry, I turn on the HW for 3mins again this morning, just to make sure which pipe has heat. I could feel the heat on the left-hand side aswell.

Tested the pump, they are good. I filled the system up and turn on the HW and it fired up. I touched all the pipes by the boiler after about 5mins, the only part that gets really hot is the pipe below the pump (same as the picture with the red box). So, I turned off the HW. After about 5mins I...

Thanks guys for all the supports. I'am doing it one at a time now. Btw just replaced the pump. Can I turn it on before fill the system with water, just to try if there any shot circuits again

Now I've blown my pump, so need to replace it and will keep this as an option once replaced. I've checked and nothing found.

You spot it right. Because I just opened it again and found some water in it, as the picture below. You I think this pump can't still be used after i dry it up? Now i remembered I think i didn't close the bleed nut tight and water leak into it.

I got strong jet of water out when i bled it.

Agreed, however not easy to get an enginner here. 4 didn't reply 1 turn down and 1 didn't turn out.

Ya I think it is the airlock. The control was working before I took the pump apart. After I put it back, I turned on the HW, control still working and the boiler fired up for a couple of minutes then it dies off. When I tried to turn the CH & HW, the controller blown off. The heat sink rad...

Sorry, what you mean by fully pump? How easy or complicated to convert it?

Hi, Is Grundfos 15/60 and Myson Unit compatible with each other? Can i replace Unit 5 to Grundfos 15/60?

Now, worst the control suddenly went blank when i turn the CH & HW on.