Hi - I’ve upgraded old stat for new Nest stat and heat link - all working as it should, except that when switched live is energised via 3-port valve (orange) or cylinder stat, it seems to switch the boiler off?
Boiler is Ideal Icos HE15
3-port Danfoss HSA3
Cylinder stat Drayton HTS3
All wired up as per Nest wiring diagram
Have checked S/L to boiler, getting 240v when called for, so functioning as expected.
However, I’m getting 240v FROM the boiler on S/L connector (having disconnected from 3-port) - is this correct?
As above, when all connected, boiler sits on standby - when 240v is sent to S/L, it’s as if boiler powers down.
Separate pump is connected to same terminals and operates as expected.
Any thoughts would be appreciated!
Boiler is Ideal Icos HE15
3-port Danfoss HSA3
Cylinder stat Drayton HTS3
All wired up as per Nest wiring diagram
Have checked S/L to boiler, getting 240v when called for, so functioning as expected.
However, I’m getting 240v FROM the boiler on S/L connector (having disconnected from 3-port) - is this correct?
As above, when all connected, boiler sits on standby - when 240v is sent to S/L, it’s as if boiler powers down.
Separate pump is connected to same terminals and operates as expected.
Any thoughts would be appreciated!