In May we had a (brief) period where the weather was fantastic, and I decided to turn the central heating off using the Quick Action on the Evohome controller. It was then a bit of a surprise to feel that a couple of radiators were still being turned on, confirmed by the green light on the BDR91 wireless relay in the airing cupboard.
After a bit of internet searching I came across this Knowledge Article from 2018 on the Honeywell Support website:
https://ensupport.getconnected.honeywellhome.com/s/article/The-evohome-controller-and-radiators-are-in-off-setting-but-the-boiler-continues-to-fire?language=en_US
It appears the two main reasons in the list that applied to us were a) weak batteries and b) loose adaptors. A couple of the HR92 TRVs had been knocked, and so weren't tight to their valve adaptors, which meant that they couldn't completely shut the valve. And my experiment using rechargeable batteries in the HR92s was causing me more work in comms faults and recharging them than it was saving me in money.
So I've gone around and changed all of the HR92 batteries back to non-rechargeable alkaline batteries, as well as the two AA batteries in the CS92 storage cylinder water temperature sensor. I bought a pack of 50 Duracell Industrial AA batteries from Amazon, working out at less than 32p per battery. There's no mAh capacity rating on the batteries or packaging, so we'll have to see how long they last.
After a bit of internet searching I came across this Knowledge Article from 2018 on the Honeywell Support website:
https://ensupport.getconnected.honeywellhome.com/s/article/The-evohome-controller-and-radiators-are-in-off-setting-but-the-boiler-continues-to-fire?language=en_US
It appears the two main reasons in the list that applied to us were a) weak batteries and b) loose adaptors. A couple of the HR92 TRVs had been knocked, and so weren't tight to their valve adaptors, which meant that they couldn't completely shut the valve. And my experiment using rechargeable batteries in the HR92s was causing me more work in comms faults and recharging them than it was saving me in money.
So I've gone around and changed all of the HR92 batteries back to non-rechargeable alkaline batteries, as well as the two AA batteries in the CS92 storage cylinder water temperature sensor. I bought a pack of 50 Duracell Industrial AA batteries from Amazon, working out at less than 32p per battery. There's no mAh capacity rating on the batteries or packaging, so we'll have to see how long they last.
