The Efficient Home Forum

You can change the cycle rate in the parameter settings. Default is 6 per hour.

Ours does the same, I assumed it was normal behaviour. 30 degrees flow is enough to maintain your bedrooms at 17.5 - 18, and should be more efficient for the boiler running at a lower temperature. The 0.5 degree range on the target temp is normal behaviour for this system.

Remove the HR92 head, take the batteries out, clean the battery contacts top and bottom (sometimes needs a scrape if the residue has gone hard). Whilst you're at it, gently push the bottom battery contacts (bendy metal bits) upwards with a screwdriver so you get a better contact on the batteries ...

Long press the settings button, then Sytem Parameters menu.