Taco Zvc406 Indicator Lights, Operation/External Diagnostics: When any thermostat calls for heat, the appropriate zone valve is energized and the yellow light goes on. We have 1 Taco ZVC406-EXP Zone Valve Control manual available for free PDF download: Wiring Manual The sturdy screw connections add additional reliability, while the external indicator lights provide instant diagnostic feedback, reducing installation Taco ZVC406-5 - 6 Zone Valve Control Module with Priority, ZVC406-5- Taco Zone Valve Controls work with two-, three-, or four-wire zone valves. Boiler is only come on for zone 6-DWH. Contractor's Assistant: I understand that you're having issues with the yellow lights on your TACO View and Download Taco Comfort Solutions ZVC406 instruction sheet online. Check wiring connections for loose or corroded terminals. We would like to show you a description here but the site won’t allow us. Easily Solution: LED diagnostic lights will help find a component that is not working properly. The ZVC406-5 includes an energy saving program that can adjust the temperature of a modulating Customer: My yellow lights on the TACO ZVC406 are flashing on zones 1 and 4, and solid on zone 5. The Boiler Mate I have a Taco ZVC406 zone controller. The green LED should always be on, indicating that power is connected and the fuse is good.

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