I got one of my heads replaced for the same reason the other week, took a week to get delivered. It ran with the priming button down for a few months, as long as you fill the canister up before you hook it back up it fires up fine. No point trying to fix it yourself, the German guy on the phone number i called said it will just happen again in the future, its been fixed in the new builds or something. Cant fault them, very quick delivery really.
would you be willing to donate the head to me if i pay postage, and then at least ill know my filter running at full speed?no, told me to bin it, but still waiting for replacement