st9400c

Hi, I have the aforementioned programmer which is working fine for hot water but not for CH. It seems that no matter what setting the CH is on (timer, continuous, override) it will not come on unless it is a particular time in the evening. For example, if I set the timer to come on at 2pm, the...

Hi. Whilst stripping wallpaper in our utility room, I think I may have damaged our ST9400C controller. The clock is currently “stuck” at 3:30 Sun, with the override on the heating on. Pressing “ok” and “minus” for 8 seconds doesn’t do anything and I can’t find a reset option. I’m planning on...

I'm not a heating engineer so please forgive if I get some of the terminology wrong. There's a problem I'm trying to troubleshoot. I have a CH/Water system with a conventional boiler, hot water cylinder, pump, 3-way motorised valve, and a gas boiler. The boiler is an Ideal Icos HE18 (18HE?)...

This is currently being sold at £56 by Wickes and around £96 by Screwfix. Are there maybe different versions of the st9400c or have I missed something.