Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Bosch ZWB28-3A Pump not operating

dougbigfoot
dougbigfoot Member Posts: 3
in Thermostats and Controls
installed a new control board and now pump does not operate Bosch ZWB28-3A.
Had no control on operating  temperature of heat output so I ordered and installed a new control board. Board does not put out any voltage to the pump. Tried a reset to factory settings. No pumping.
 Wired pump to separate supply so it runs independent of the control.
 The control functions are operating normally with proper temp controls and limits. Seems like a new board that has an issue but is there any thing else I can do to get the board to control the pump?
thanks

Comments

  • GW
    GW Member Posts: 4,817
    Almost seems like the board thinks you’re trying to make hot water. Did you install the chip on the new board? If yes, that’s a stumper 
    Gary Wilson
    Wilson Services, Inc
    Northampton, MA
    gary@wilsonph.com
  • Big Ed_4
    Big Ed_4 Member Posts: 2,983
    You need to program the new control ... Best to call tech support ..

    There was an error rendering this rich post.

Categories