pump overrun baxi solo3 PFL?

I'm suffering the same problem. It seems that the on-board relay contacts are 'welding closed' so pump runs on after time-out. i.e. relay undersized. Proof is that if you tap the underside of the control unit after time-out, the relay drops out and the pump stops. Suspect the only long term fix is to add a larger interposing relay with more robust contacts. I haven't tried this yet.

Steve Clayton
February 2008