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There is a quick way to diagnose the issue you're having with this Zurn Z6915-XL-ACA-MV Faucet (Part #162825). Disconnect the cable that attaches the Black Module to the Sensor of your Spout. Keep it disconnected for about 1 minute then reconnect the cable and look to see if it cycles any water.
1 Cycle of Water = you have a defective Sensor and you will need to buy a new Spout Assembly (Part #163078).
No Water = you have a defective Solenoid Valve. You can remove the 4 screws on the silver Solenoid (located on the black Module) and clean out the round diaphragm. If that doesn't work, you will need to replace the complete Electronics Module (Part #113350).
If you have any other questions our experts are here to help! Call or text 800-518-5388
Posted by Kully Supply on Wednesday, October 18, 2017