Recent content by markhobley

Wow! Opening the valves one at a time was a good idea. I closed the input valve, and pressurized the system. The pressure in the boiler increased, so it must have been back filling through the output. I then opened both valves, switched on the boiler, and the output pipe was hot. I left this...

Just to be clear British Gas had just attended the boiler, but left it in a non-working state, saying that I needed a system flush, and that I would have to pay £500 for this. I don't believe that there is a blockage in the radiators. If there is a blockage, I believe that it is in the boiler...

The pump is working in Central Heating mode, but the output pipe does not get warm. The output valve is in the open position, but I cannot easily unhook it to check if it is open internally, because the pipework is tight around it. I really need to change the output valve, because when I close...

He didn't drain the whole system, so must have used the isolation valves. This is a sealed system anyway, so it is easy to de-pressurize. Hi did inject a tube of sludge remover into the inlet tube, but this never circulated because I get no output to the radiators. I later drained the whole...

I thought that, but the diverter diaphragm has been replaced, and on the Worcester, when the diverter is in the hot water position, a little button which I think is on the diaphram spindle, pops out, and activates the electrical switches that demand hot water. There is no hot water demand during...

I have a Worcester 240 boiler. The hot water works fine, but if I try to use the central heating, the heat does not leave the boiler (ie the output pipe stays cold), and the boiler overheats, tripping the overheat switch. When I run the hot water, I notice that there is no run on through the...

This appears to be the flow detector for hot water demand. I must have knocked it when I lowered the bottom housing. I still have the problem with central heating. Am I looking at the correct valve? Is the diverter valve controlled by the flow of hot water, ie the valve is always in the central...

It turns out that this is not a relay or solenoid, but a couple of momentary microswitches. There is a plunger coming from the valve, which activates the switches. On my boiler, the switch housing has cracked, so the switches come away from the plunger. The switch housing is attached to the...

I guessed maybe the flow of cold water through the boiler was providing sufficient cooling in hot water mode, preventing the overheat, but I was wrong. It is not the pump. The pump is working using the test that you suggested. I drop the bottom of the boiler containing the switches and circuit...

I have a problem with my Worcester Bosch 240 boiler. The hot water works just fine. However, if I make a demand for central heating, the boiler fires up, and within about 20 seconds, the boiler pressure gauge rises rapidly to about half way, before the boiler overheats, and the reset switch pops...