Pump Stopping and starting when boiler re-fires

[jonwills]

Another Post by the owner of a Potterton Suprima 50 Boiler! Fortunately I don't appear to be having all the problems that have befallen so many of you.

We recently moved into our house which has an open vented CH & HW System comprising the following: Suprima 50 Boiler, Grundfos Pump and ACL Mid Position Valve.

With any combination of HW &/or CH everything is fine. Water in system reaches temp, continues to be pumped, cools, Boiler re-fires to re-heat the water. At this point the Pump stops and then a second or two later re-starts.

Is this a Suprima problem or a wiring problem?

Cheers

 

[Vic Spanner]

Its not a problem its how the boiler works.

 

[gas4you]

Its called pcb logic The pcb has to control things its own way to know they are working properly.