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Hi All, need a bit of help on CH problem if possible. System is a Glow-Worm Space saver 30 boiler, a Grundfos 15/50 Pump, Honeywell room Thermostat (no model number shown) and a Honeywell Sundial Y Plan Mid Pos Diverting valve (V4073A). OK ? Now then, Water heating is fine but when switching on...