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Hi Corgiman So, the old board is removed along with the control unit and both are replaced by the 5111603 unit?

Guys Sorry for starting a new thread, but I wasn't sure how active the older threads might be. Okay, Potterton Suprima 60. I had loads of lockouts and finally went to fleabay and got a recon PCB part number 407750, and things have been fine for over a year. Got a few more lockout, (one...

Potterton Suprima 60. Set to max Omyson pump. Set to number 3 (max) All rad. have a TRV except the bathroom. Main thermo. set to 21oC 3 Bed semi-det. House. The problem is the moaning/vibration noise. There is a bit of a bang, when the boiler strikes up. The system is about 7 years...