ecotec 428

Hi, I am trying to understand the root cause of my radiators getting lukewarm at best. I have an ecoTEC plus 428. It doesn’t display any fault codes, but it spends most of its time with the boiler off, displaying a blinking radiator. Seemingly, as a consequence, my radiators never get more...

Do they work together? Part of sorting out the flow in my system was the fitting of a new pump. (The poor power flush filled the old one with iron filings but did cure the boiler noise). So I have a UPS2 which has the 'Variable Speed Mode'. The system is a conventional with loft supply tank and...