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The pipes are connected correctly, and if i connect a tube to the red input and blow gently the boiler fires up. So i guess the problem is either fan not powerful enough, or switch not sensitive enough. The pressure switch is the same as the original. Those pressure switches have an...

I have a Potterton Profile 60E with fanned flue. The old fan works ok, the pressure switch is new. On startup the fan runs, but there is not enough pressure going up through the heat exchanger and up the venturi to operate pressure switch. If i blow up the tube to the pressure switch the switch...

Ok that makes sense, TL is the Time Control live in, but why is there another Live in on L, its not needed is it?

Yes, there is H, C, L, TL, N. H is i believe switch live for Heat C is switch live for Cold. L is live in N is Neutral in. But what is TL

Hi Does anyone have the wiring diagram for a Potterton Hot Water tank themostat, type PTT2.

Yes i think it could be one of those two at fault. Can you explain how the 2 pressure venturii work, one is pointing down into heat exchanger the other is pointing up the flu. How is the differential between the two venturi generated?

No, its a Profile with twin flu, with plastic tube from inner flu and one from outer flu going to pressure switch to check for differential pressure between the two.

Where is the Aps tube?

Hi I have Potterton 60e, on switch on the fan starts ok but the pressure switch is not switching to start gas and light pilot. Both air pipes are ok, the sealing of the boiler seems ok. If i force the air pressure switch the boiler starts ok. Is the problem lack of sealing to the boiler...