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Hi just to say thank you to all that responded. I fitted the 3 port switch today, and the heating is back on.

It hasn't made any difference to the ch, rads are still cold exc that one closest to cylinder which feels a little warmish. ive ordered a new 3 port switch for tomorrow. Will see if it works. Thank you for your help, it's much appreciated

A further 2 and 1/4 turns so 8 & 1/4 in total.

6 full turns takes it to this

To the right of the red needle bit it says 1

Ok I've checked valve.cant really tell

Both read 49 now

It just says screw to adjust and an arrow to right with a plus sign. I'll put ch and hw on continuous and take another d40/41 reading in 15 mins

Hi the boiler won't fire with just ch on, it states s30 on display, only fires when HW is on. Do you want me to put on both ch and hw? The red valve in pic is I think is a pressure release valve, It has a + and - and says screw to adjust? Or do u mean the dial on the cylinder?

Ok so hw is on continuous no ch, readings after 5 mins are d40=59, d41=56

D40=77, d41=78

No rads don't get hot at all apart from when I run ch only on d70 =2 and then the only rad that gets warm is the closest one to cylinder. That reading is when not firing btw. Do you want again when firing?

D40 =21, d41=25

It's firing up and staying on, pipes coming out of boiler are hot. I will check d40 and d41 when back home. Thank u

The latter is happening

None of them are failed, they all worked last week, before I changed the water sensor. And hallway doesn't even have one and that's cold too. Plus all the pipes to the rads are cold.

All fully open but only one rad is slightly warm, the closest one to the cylinder

No resistance at all with power off

Yes thermostat on max. This is current position of 3 port valve

Can I try and move it with electric on?