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by the way, the first time i turn the spindle, it didn't work. But I did all those again and also change the speed. It worked. Thank you, Kev.

Kevplumb, thank you so much for all the useful information. You are great. It is all working now. You were correct that pump rotor could stuck. You were also right that turning the spindle a bit could solve the problem. It did. The boiler is working for 10 minutes now, and is still working...

Ouch, the spindle was really difficult to turn. It seems to require a special tool. But I did turn it a bit, only about half turn. Then I turned on the power, it didn't work....... About the valve, what happens when it's turned to manual? Does it flow both CH and HW?

No, Kevplumb, I haven't. But I did check the power is up to 240v when no movement was observed. I should try it now. In addition, the motorised valve seems to have only two positions for the lever. Shouldn't it have three positions? I cannot see clearly due to its position. But I...

Kevplumb, Thank you. The spindle wasn't turning when power is supplied to the circulator. I guess this is THE problem. I've attached a picture of the circulator. Could someone tell me what are the fittings above and below the circulator? Are they stop valves? I am pushing my luck...

Thank you for the prompt reply. Let me check the circulator first. Do I need to shut the valve before checking the spindle? Your advice of having a cloth handy makes me think water can come out from there. Thanks.

My boiler has been working intermittently even when the hot water tank is full of cold water. My trouble-shooting led me to believe the thermostat in the boiler is what's cutting out the boiler. The trouble is - why does it do that? I guess two possible reasons, either the thermostat is...