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If the flame isn`t as high as usual, it`s modulated down due to sufficient heat in the heat exchanger, fan would follow suit. Overheat stat may be at fault giving a false reading on flow temperature, although you can override it with hot water on slight demand? Sounds much like a flow problem.

Does the boiler make a kettleing sound, as if the water`s boiling in the pipes?

Fan doesn`t start then? If not, start checking across the connections from the microswitch towards the fan, multi-meter would be handy, goes from the left hand pcb to the right hand one via a jump over, follow the fan wires back if you`re unsure. Somewhere you will find where the power to the...

Undo the screw in the center of the pump, is it spinning? Does the pin on the diverter come out fully clicking the microswitch in the plastic housing clipped to it? All this should be checked on heating only! Forget the hot water for now, that`s the easier part. The pump should start first...

Avon anti ageing hand cream does it for me. Tried loads myself due to cracking finger ends etc. But i`m not gay or owt! :shock:

The room stat will be the best place to start, that tells the boiler to fire. Go to the control box and try linking it out with a piece of wire(power off first obviously)

As posted earlier, you may place a stat anywhere you like in the house, best kept in a room where you spend most time, away from the rad, 1.5 meters from the floor, not where it will be affected by direct sunlight, and not on an outside wall.

Before we get into this, are you comfortable checking things inside the boiler? posted twice :oops:

Before we get into this, are you comfortable checking things inside the boiler?

http://www.vokera.co.uk/ And go to literature.

It`s worcesters policy of selling as many spares as possible, even if you don`t need `em! Why sell just a board when you can sell a gas valve too?

I`ve had 2 customers who have told me on entering their property that they`ll supply the boiler because they`ve seen them on the internet at a knock down price. Believe it or not i don`t mark up on the boiler i supply, customer A bought a worcester bosch for £97 more than i`d have paid, and...

According to my area inspector, on a boiler change trv`s should be offered to the customer, if they refuse them it`s the homeowner contravening building regulations not the installer. The system you are effectively upgrading wasn`t designed by you so it`s basically a loophole. On a new system...

Replace it. You can`t alter the resistance, once it`s gone it`s gone!

It`ll be on the manufacturers instructions for your boiler. Most manufacturers state as a rule of thumb that no plastic pipe or fittings within a metre of the boiler.

Buy some sentinel X300, put it in the system, read the bottle, follow the instructions, flush thoroughly, then add the inhibitor, preferably a good brand name such as sentinel X100. How on earth did your plumber fill in the benchmark if he didn`t even put the inhibitor in?

Yes you`ll need to take out the existing timer. They`re a staight plug in affair. Not cheap, about 120 to 150 quid, but saves on wiring etc, and you can do it yourself. And yes, the room with the new room stat in should have the trv removed.

Sounds to me like he was rubbish! No inhibitor and no room stat. There`s a wireless 7 day programmer and room stat for these, plugs in the boiler. Worcester MT20.

I asked this last night about your system. Seems to me it`s a self install from the description you`ve given.

Answers on a postcard please :wink: