Booked for a quick response. Was promised attendance same day, then ERG rang to say they couldn't make it. Rescheduled for day after. Next day they rang late in the day to say they couldn't make it that day either, rescheduled for day 3. When the plumber arrived he could not diagnose the problem apart from saying that the wireless receiver needed replacing, and disconnected the clock on the boiler. Did not seem to know what he was doing - I had to look for a YouTube video to show him how to reset the controller. I sourced and fitted a replacement receiver, fault still not fixed. And I paid £150 for the privilege. Not using this company again