I installed the Munro MPSR242W22, which is the low power pump start relay and had a scheduled run work without the Zone Fault Error! I think the Munro MPSR24 relay commonly in use for irrigation systems using 220v pumps requires more amperage (360mA) than the Rachio 3 will deliver (300mA). The low power relay has a component built into it that lowers its power demand to function to 50mA. It looks like it is working, but the system hasn’t run a full cycle yet of all zones and that will be the real test. I’ll report when that happens. Rachio has been good to work with through this difficult process and has made the frustration, time and expense worth it. We all know now how to deal with this issue.
