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Mend Baxi Solo3 PFL Pump Solo

pump overrun baxi solo3 PFL?

my baxi solo 3 PFL honeywell printed circuit board ,tells pump to run with no demand on s/v terminal (HEATING-H/WATER) this is the 2nd pcb which has lasted app 20 months. manufactuses not helpful and want me to buy another board (£140),changed overrun capacitor £6 but as I thought didn't work

derrick
February 2008
BaxiBaxi Solo3 PFLHeating, Home Heating SystemsPump Baxi Solo
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

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Baxi Solo3 PFL Pump Overrun Issue - Fix?