If your Hydromatic® HRS pump isn't starting in Auto mode, try these troubleshooting steps: First, check the pump circuit breaker and control fuse to ensure neither is tripped or blown. Next, verify the incoming power voltage and control circuit voltage are at the proper levels. Then, inspect the overload relay to see if it's tripped, and reset it if necessary. With the power off, check the motor heat sensor continuity. Also, confirm that the pump's wiring to the control panel matches the provided schematic. Check the contactor coil resistance; it should be between 125 and 150 ohms. Ensure the floats are correctly connected to the control panel, as reversed start and stop float connections can cause short cycling. Make sure the water level is high enough to activate the floats. To isolate float issues, remove the off and on float wires and replace them with insulated wire jumpers. Turn on the power with the H-O-A switch in the Auto position. If the pump now runs, the problem likely lies with a float; identify the faulty float by reconnecting them one by one. Verify the run light operation by running the pump in Hand mode. Look for any loose wires at the run light or within the control panel. Finally, check the impeller for any debris that might be causing it to drag in the volute, potentially indicated by a high amperage draw. Following these steps should help you diagnose and resolve the issue with your Hydromatic® HRS system.
