You boiler's brain is the relay. It gives power to low voltage hardware and tell each piece what to do.
Relay systems vary, and sometimes they need to be changed when hardware lags
Boiler relay switch and transformer
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See AllPutting the finishing touches on this home. Most of the fixtures are pre installed, however there is much that needs to be completed upon assembly https://youtu.be/IVBISI1x32w
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