Boiler not turning off now won’t turn on without HW

[Bmd33]

Hello

The other day my boiler suddenly stopped turning off either with the thermostat or the control box, it wouldn’t switch on the hot water either. I had someone to check the boiler (under warranty) and they said it isn’t the boiler but somewhere else in the system.

Having read a few threads on here I suspected the 3 point valve so had a look. I took it off with the push button and the spindle underneath moves easily but a tiny amount, I can’t imagine it can get to the three positions but could be wrong. The photos trying to show how far it moves. The levers on it do move when the boiler is switched on and off.

I put it back and everything seemed to start working again but now the heating won’t turn on unless the hot water is heating up (which it obviously does then turns off so it’s freezing!). Not sure why it’s changed from one problem to another, can anyone advise? I would much rather have the heating on and can’t get it changed until the middle of next week by someone that knows what they’re doing unlike me! Does it sound like this part is the issue?

I’ve got a Baxi 600 with a tank and cylinder set up

 

[terryplumb]

Show us a picture of the thermostat on the cylinder.

 

[Bmd33]

Any use? It’s so dark in there!

 

[terryplumb]

If you want heating on ,release that thermostat off the cylinder. Set programmer to domestic hot water,and manually latch the 3 port valve open.
You may need to lower the boilers stat so cylinder water doesn't get excessively hot.

 

[Bmd33]

If you want heating on ,release that thermostat off the cylinder. Set programmer to domestic hot water,and manually latch the 3 port valve open.
You may need to lower the boilers stat so cylinder water doesn't get excessively hot.

Thank you, how do I take it off the cylinder? I’ve been trying to work out how to open the valve but can’t seem to move any of the levers myself?

 

[terryplumb]

The stat sits in a "nest" ,(for want of a better description) cut out of the insulation. The banding keeps it pressed inward against the copper cylinder.
To latch the motorised valve open use the lever on outside of body ,slide it and lock it in place .

 

[Bmd33]

Thank you I still can’t move the lever unfortunately, it’s stuck over to the right in this photo but obviously I’m looking at it upside down iyswim

 

[terryplumb]

Take the whole actuator head off the brass body (and leave it off) ,like you did earlier,and use your pliers to turn the spindle to open flow to radiators.
Bit of a bodge ,but will give you heat.

 

[Bmd33]

Take the whole actuator head off the brass body (and leave it off) ,like you did earlier,and use your pliers to turn the spindle to open flow to radiators.
Bit of a bodge ,but will give you heat.

Thank you, I’ll give it a go tomorrow