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TACO ZVC 406
Has anyone on here had issues with Taco ZVC box buzzing and lights flashing but still working? I have never had one do this.
One time. Newer version. funny flicker on one on the displays.0
What kind of thermostats?steve0
What zones are the LED's "flashing". If you take the t-stat wires off the zone ( zones ) that are flashing and just jump the R-W of the zones does it still flash or are they solid? What type of t-stats and do they require a com wire?0
You might need to use the resistors that comes with it if you are using power stealing thermostats. I can't remember what the resistant of them are, but I know they come with the newer ZVC control boxes. Some stats will cause this.
It may be that the two transformers are out of phase. Perhaps transformer A is somehow connected to transformer B thru some mis-wiring.0
Thanks for all of the help. I traced the issue to the a short in the main board near the master/slave switch.
The thermostats are a Honeywell Digital with battery.0
@rick in Alaska the resistors that come with each ZVC & SR controls are 1000ohms .5watt1
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