If the CH is on and you turn the roomstat down, does the pump stop after its overrun period and then restart shortly later or does it just keep running continuously?
What does it do when you turn off DHW with eco mode selected on? and is the behaviour the same with Eco mode selected off (DHW preheat on)?.
What do Worcester say?
What does it do when you turn off DHW with eco mode selected on? and is the behaviour the same with Eco mode selected off (DHW preheat on)?.
What do Worcester say?