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Right, I know these are probably the worst boilers many will come across.:mad: I have an L9 fault Pressure good. Vented of air Pump is only receiving 40ish volts! (loom checked with pump disconnected) So I know pump will not turn, and hence why L9 but why low voltage. Boiler had not been...

i have a system which requires 2 pumps (trying to make good some poor diy work) :roll: the system has 7 zones (6 ch, 1 dhw) and i need to split 3/4 using 2 pumps to overcome excessive circuit resistance. there is a new 40CDi conv and as i'm sure you know these control the pump and this is...