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Bosch Greenstar 103 and FW200 supply temp


I have a Bosch Greenstar 103 and FW200 controller. Both display the supply temp but they are different. I’ve attached a pic showing the display. Shouldn’t they agree?  



  • fenkel
    fenkel Member Posts: 162
    looks like the boiler isnt running at this time ( no green light on.)... these temps might get closer when system is running.
  • billwade9803
    billwade9803 Member Posts: 3
    I’ll check when the DHW calls for hot water but I think it’s still different.   
  • billwade9803
    billwade9803 Member Posts: 3
    This pic was while the boiler was on - 

  • Big Ed_4
    Big Ed_4 Member Posts: 2,697
    150* would be the set point , and the unit screen would be the actual temperature . It is a small mass boiler you will get a swing to supply an average .
    I have enough experience to know , that I dont know it all