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Ehawthorn
Community Member
since ‎10-26-2021
‎12-15-2021

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E74 error when installing thermostat

10-26-2021
Hi there! I have spent the day trying to resolve an issue with installing my nest thermostat. I have a burnham ES2 boiler and a three wire set up (W, Rh and C). Since trying the initial setup I have continually received an e74 error despite trying al...