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F.22 on the boiler screen this morning. I heard it start up earlier but no heat sent to rads. Water pressure is 1.5 bar. Recently bled rads, shouldn't be an air lock. Is there anything else I can try myself? I am assuming maybe pump blockage/failure? Many thanks, Rich

Whats the downside to leaving it in Manual open? is that safe to do for now? I guess I need to order one of these: http://www.amazon.co.uk/Honeywell-V4073A1039-V4073A1054-V4073A1088-V4073A1062/dp/B00BANXMAQ/ref=sr_1_1?ie=UTF8&qid=1449336312&sr=8-1&keywords=Honeywell+diverter+valve Many...

Thanks, is it this box? It has one pipe coming in from bottom and two going out each side. I just moved it from "auto" to "max open" after turning HW off at the programmer. Now my rads are heating up :-)!

Is that something I could test/fix myself? Thanks

please can anyone suggest what I can try next to fix my CH? Hot water is working fine. Boiler diagnostic display says S.30, which is the code for no external heating demand. I replaced the Honeywell 6400C programmer with a new ST9400C, as I had read they can develop faults. The programmer seems...