Those pump connectors are poorly molded, very tight to fit properly and often make an intermittent connection.
99% of combi repairs do not require a system drain down or the radiator isolating valves to be used...those that do are either inexperienced or dragging the job out.
AFAIR the early pumps were Wilo and the later ones Grundfos. Ferroli only seem to sell the complete extortionately priced Grundfos pump including the back casing to upgrade from the earlier Wilo pump.
You could try https://www.euroboilerparts.co.uk/circulating-pumps-13-c.asp for a replacement pump head including the cable and connector.
Also be aware that rotating the control box down is likely to disturb the soldered connector joints and they often require re-soldering (poor quality from Honeywell).
99% of combi repairs do not require a system drain down or the radiator isolating valves to be used...those that do are either inexperienced or dragging the job out.
AFAIR the early pumps were Wilo and the later ones Grundfos. Ferroli only seem to sell the complete extortionately priced Grundfos pump including the back casing to upgrade from the earlier Wilo pump.
You could try https://www.euroboilerparts.co.uk/circulating-pumps-13-c.asp for a replacement pump head including the cable and connector.
Also be aware that rotating the control box down is likely to disturb the soldered connector joints and they often require re-soldering (poor quality from Honeywell).