How to Fix a Compool LX220 Solar Control System

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The Compool LX-220 is an automatic controller for solar-powered swimming pool heating systems. The unit monitors available solar energy and actuates a motorized, three-port valve to divert water to solar collector panels when sufficient energy exists. After a preset pool water temperature is reached, the LX-220 channels water away from the panels and back into the conventional pool return plumbing.

Things You'll Need

  • Voltmeter
  • Check the external circuit breaker if the "Power On" light does not illuminate. Check the internal 3-amp circuit breaker. If the internal circuit breaker is tripped, try disconnecting the circuit board and the valve actuator one at a time to determine the source of the fault.

  • Observe the two "Sensor Service Required" lights on the LX-220 control panel if the "Solar On" light does not illuminate. If either light is on, check the cable and wire connections leading to that sensor. If no fault is noted in the circuit, test the sensor with an ohmmeter and compare against the manufacturer's specification. Replace the sensor if necessary.

  • Observe the two "Sensor Service Required" lights on the LX-220 control panel if the "Solar On" light never goes off. If either light is on, check the cable and wire connections leading to that sensor. If no fault is noted in the circuit, test the sensor with an ohmmeter and compare against the manufacturer's specification. Replace the sensor if necessary.

  • Make sure the toggle switch on the valve actuator is set to either "ON1" or "ON2" if the valve actuator does not operate when the "Water Flow to Panels" switch is actuated. Test the output of the VLV1 socket on the LX-220 circuit board with a voltmeter. With the "Water Flow to Panels" switch off, the top and middle pins should read 24 volts AC. With the "Water Flow to Panels" switch on, the top and bottom pins should read 24 volts AC. Replace the valve actuator if the voltage readings are correct. Replace the circuit board if the voltage readings are incorrect.

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