Coms fault on all HR92 radiator controllers

[Gooch10]

Morning. Just wondering if anyone can help. Woke up this morning and the main evohome controller is not picking up HR 92 valve heads and also the underfloor heating. It just says comms and 20 degrees on all the radiator valves and no temperatures on the main controller in each room. Do I need to reset the system

[Richard]

No. If you have a DTS92E or CS92A wireless tank thermostat you just need to change the batteries. When these devices get flat batteries, they screen the other devices as they transmit RF on 868 everywhere.