Search results

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

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...