Error 51 doesn't exist on SCC and SCC_WE models. If you are referring to a Combi-master or Combi-master Plus (CM or CMP) then error 51 means the battery on the control board is below 1.5 volts and should be replaced. Go to your local electronics or grocery store and buy a CR2032 battery, it looks like a quarter. Open up the front control panel and replace the battery.
Hi We have replaced the battery and still encountering the same error code.
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HI Stuart... did you solve this issue? got the same!
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