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The air pressure (approximately 2 inch water column) activates a switch through a rubber tube that connects from the air trap to the pressostat. During the fill cycle, the water solenoid gets its signal from the pressostat. When the pressostat is satisfied, it cuts the signal to the solenoid valve and sends power to the thermostats and the timer When trouble shooting this system, all components must be considered. Beginning with the pressostat which is adjustable. Making sure the connection to t