@Feldazin - another way to handle this is to get a separate 24 VAC power supply that will power the pump start relay, wire it through a single pole single throw normally open relay switch (SPST NO) (one side of the power supply goes to the pole terminal on the relay, the other side of the relay (NO) goes to the existing pump start relay and the the other line of the pump start relay goes back to the new power supply) and have the Rachio M terminal go to the new relay’s coil and then the other side of the coil to the Rachio C terminal.
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