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Frequently Asked Questions
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Q. What causes my thermostat to short cycle?

Q. Can I use the 570-2 series in an open system such as domestic water?

Q. Is the Taco zone valve a three wire zone valve and how do I wire it?

Q. Why does my zone valve let flow through it when it is not powered?

Q. Why does my Flo-Chek leak by?

Q. Why is my Flo-Chek or MPV noisy?

Q. My house has five zones, each with its own circulator. Hot water is passing into zones that are not calling for heat. Do I have some defective circulators?

Q. I have a 3-zone residential system with a 219 Flo-Chek on each zone. The manual override thumb screws are all open ~2 turns. Should these be fully closed?

Q. The installation in question has zoned hydronic heat, controlled with 3 Taco 571 zone valves and 3 Taco 568 thermostats. I need to replace one of the thermostats, but Taco no longer makes the 568. Are the newer thermostats with no heat anticipators compatible with Taco zone valves? The instructions with the 571 valve say that the thermostat heat anticipator must be set to 0.9A to match the valve rating. Will the valve function correctly without a heat anticipator in the zone?

Q. How to tell if your 500 series zone valve is good