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nti tft 085 fault code 99 exceeds 28v

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duffy_4
duffy_4 Posts: 80
in Radiant Heating

any ideas on solution for this,boiler is 6 years old no problems during that time,doing in floor heat via warmboard multi zoned with buffer tank and 80 gal indirect,here in chicago. incoming voltage is 128 across both phases at 100 amp panel im getting 28v on low voltage side of boiler,tried new transformer…no help.anyone else have this issue.got com ed come out they sat everything is with in specs.looking and trying a power conditioner or a step down buck boost transformer.thanks for your help

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