Disconnect the cable from the CRO unit to the coolant connector bracket on the side of the machine.
For this section, complete all voltage measurements with the CRO unit commanded ON. On the Coolant Refill display, press [F3] to Add 5 gallons of coolant. Press [F3] again when you are ready to stop the CRO.
Note: Use the notch [A] in the connector as a reference to find the correct pin.
Measure the voltage to the water supply solenoid : The voltage across pins 2 and 5 of the connector on the coolant connector bracket must measure 120 VAC.
Measure the voltage to the coolant concentrate solenoid : The voltage across pins 1 and 4 of the connector on the coolant connector bracket pulses on and off for 0.25 seconds each time it activates. Set your multimeter to Min/Max.
If the voltage is correct at the connector bracket:
- Connect the cable from the CRO to the coolant connector bracket.
- Shut off the water source.
- Measure for the voltage at the solenoid connectors [1 and 2]. They must measure 120 VAC. If there is no voltage at the solenoids, the solenoid cable from the CRO to the coolant connector bracket is at fault.
- If the voltage to the solenoids is correct, clean the solenoids. Go to Section 5.
If there is no voltage at the coolant connector bracket: Go to the applicable link below to troubleshoot the I/O PCB.