1) The pump may be in a mandatory dormant (inactive) state once the Rinnai Tankless Water Heater has detected that the desired temperature is acheived. 2) Confirm the push button is paired properly by pressing the push button. 3) The LED on the module flashes green to confirm that the push button is paired properly. If the LED does not flash green, your push button battery may need to be replaced, see your push button installation and owners manual for instructions on battery replacement.