Viessmann WB1B error FC


Old 08-25-18, 04:33 AM
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Join Date: May 2011
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Viessmann WB1B error FC

][/url]Hi ,
I had to replace the pump control board on my Viessmann WB1B boiler because of bad transformer. Than as soon as I turn the power on , the unit will blow the 2.5A fuse on the main control board .
So I started connecting one module to the board at the time. Once the harness of blower fan connect to the board main control board it blows the fuse.
Without connecting the blower fan to the board I receive error FC .

I am not sure how to troubleshoot this issue, any advice .
Thank you.
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