TRV refuses to connect after re-calibration

[bgt432]

13 TRVs on the system, with 4 extenders. System was installed in May 2024.

2 TRVs don't shut off fully - one worse than the other. Read-up on recalibration process and undertook procedure.

One (bed 4) is allowing heat to radiator when only hot water is operating. this has got progressively worse, until now the room is like hot-house conditions. After calibration, heating is much less but still seems to be some flow to radiator, however it is still recognised by the app. and is connected to hub via an extender route.

The other (shower room and on a Danfoss adaptor) was not the same problem; instead when only one room at the other end of the house is put on boost, the shower TRV opens to full, even though its temp is set to 0 and not on schedule. This too was recalibrated, but now will not connect to anything.

I have:

• Reset TRV (multiple times both on and off the radiator) - no connection.
• Deleted from app - no connection.
• Unplugged extender and re inserted after 10mins. - no connection.
• Unplugged extender and re inserted after 10mins., removed batteries from TRV also left for 10 mins., and left overnight - no connection.
• Changed batteries - no connection.
• Removed TRV, reset and placed it within 1ft of the hub - no connection.
• Switched off all installations of app for 1/2 hour and repeated all of the above (with the exception of the overnight bit) - no connection.

What else can I possibly have forgotten?

[BrianT58 · Accepted solution]

I'm not a heating engineer but from my limited knowledge if you have rads getting hot when system is only calling for HW then you may have a seperate issue with the diverter valve not switching over fully.
As regards the connection issue I would suggest you to contact technical support: 0333 6000 622 or support@schneider-electric.zendesk.com. 
I rang them when I had connection issues and within a couple of hours it was all back ansd has been working since.

[bgt432]

Diverter issue was also my suspicion after some thought. Re: tech support - yup. I have a suspicion it might be. duff unit.

Thanks