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4a code on gb142

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Paul_69
Paul_69 Member Posts: 251
in Gas Heating
Repeat 4a codes and replaced sensors a few times and check wiring etc. Could it be plugged on the flow thru the exchanger? circ. working, boiler installed 2006, is this end of its life? trying to get a hold of a local rep. in mass. and budeus tech support seems to be reading a script..

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