Ideal Logic+30 DHW works but no CHS

[DanWicks]

Boiler has developed this fault over the summer. Worked fine when CHS was on back in the Spring.
Pressure is 1.5
All valves are open - pointing up
Set to winter mode.
Boiler fires up but after a couple of minutes stop and displays pump overrun. No error messages.
Immediately under the boiler the CHS Return heats up before Flow.
Pump is running, I can feel it buzzing, and when bleed valve at front removed shows spindle going around.
Any ideas?

 

[DanWicks]

Looking at other sites, the flow turbine sensor light isn't on. Should it be?

 

[AGAS]

Immediately under the boiler the CHS Return heats up before Flow.

when was this boiler installed ?
sounds like the flow and return pipes are the wrong way round to the boiler

 

[DanWicks]

Flow on the left with pressure gauge. Return on the right with filling loop

 

[DanWicks]

Further googling...flow turbine is for DHW and sure enough comes on with demand

 

[dilalio]

Does pipe get hot after the pump? How much further? Can you feel any heat coming into 1st, 2nd, 3rd... rads?

Sounds like circulation issues.

Edit: just read op again... from your description go with Agas as return to boiler is actually flow by the sounds of it!

 

[DanWicks]

Def connected the correct way, it worked up until this summer and nothing has changed other than turning it to DHW only. Return only gets hot for the first few inches, rather than pumped around
Am now investigating Divertors

 

[DanWicks]

Latest diagnostic...unit is in summer setting for DHW only. The Installer mode shows Diverter is in CH setting. I've removed it and there is signs of rust so I'm going to try replacing that

 

[DanWicks]

I've replaced the diverter actuator and we now CHS!!

 

[AGAS]

now how are you going to test the boiler is now safe ?

 

[dilalio]

now how are you going to test the boiler is now safe ?

And holdin yer breath won't help!