New logic + central heating issue

[Irish]

yeah another vote for checking the pump had the same issue before , it was the pump that wasn't rotating

 

[Scott_D]

Have you got water at the radiators and filter when filling up?

 

[Dannyboygas]

Don't know if previously mentioned just going through things in head, there isn't an anti grav valve anywhere?

 

[Leo21]

Is the hot water working ok?

Clever you, that would prove pump.

 

[thorn]

I like the rubber bung suggestion, I did already think of that! The hot water is working fine and it does not actually overheat and lockout, it just gets to 75 or so degrees and goes into standby and doesn't need resetting.

 

[thorn]

The rads are filling and draining ok when I fill or drain the system, it is about 8m along the landing from the boiler to the cylinder cupboard so will check for any valves etc tomorrow. Hopefully it is the pump as had been mentioned a few times. Would hot water working prove that the pump is working?
thanks

 

[smtplumbing]

Check the pump was it a f5 fault I had this on the new logic I linked out the flow sensor on the flow linked it then bleed the pump then rocked it no hassle after th

 

[thorn]

Went back today, checked all the simple stuff like pump and valves, all working as I suspected. Took up a load of floorboards and found that the return I had capped, the old cylinder return didn't tee into anything, it just went straight back to the boiler. No idea how it worked before, basically I don't think it did and suspect the last guy in to change the cylinder, pump and 3 port had screwed up. Don't see that the heating can have worked in the state it was in. Ended up teeing some 22 into the 28 and hey presto job done!
Landlord Doesnt live locally and I think she has just brought the property so don't think she was aware it wasn't working

thanks for all the suggestions from everyone