B
Bamber gaspipe
ChrisR said:You need to get a contact onto the connector where the two green wires go in. There will be a voltage across them (probably24vdc) when the switch is open (fan off) which will go to zero when the switch closes and shorts it out.
You need a variety of probe tips to do this sort of thing. If you look at the shell for the connector, you might see small hole for each wire, in the side. Otherwise you have to connect a thin piece of wire to your probe and poke it down where the wire goes in and hope you can make a contact. If you can get access to the other (solder) side of the board you can probe the relevant pin there.
An alternative is to just connect the two wires at the aps before you turn the boiler on. I don't know what this particular boiler would do but often they "object" knowing that the switch shouldn't be closed , and go to lockout straight away, but sometimes they don't do a check at all and the boiler works.
I carry an adjustable aps, which makes it easy..
This your interpretation of using a multimeter Chris???
Didn`t think you would reply you Gutless, whining Coward....