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Extra zone coming on with priority DHW
wt
Member Posts: 13
Hi all, I'm not sure if our Taco ZVC 406 is fritzing out or what. Whenever our DHW (zone 6, priority on) calls, our zone 4 comes on. The box is 19 years-old but nothing has changed with it in terms or wiring or anyone doing anything with it or to it. I just happened to notice both zones on one warm day, so I tested it and sure enough, zone 4 calls whenever zone 6 calls. It appears as if zone 6 is causing zone 4 to call. Anyone ever seen something like this? Do I need to get a new Taco unit?
Thank you very much in advance,
Will
Thank you very much in advance,
Will
0
Comments
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No ideas yet? I'm a little surprised. Should I just replace the ZVC 406 and cross my fingers then?
Thanks0 -
I'd say replace it. It's doing something, it should never do.0
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If you remove wires from TT on zone 4 and jump TT on zone 6 and zone 4 valve still opens, it's internal and you need a new board.0
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Indeed - I jumped zone 4 TT to 6 TT and it again caused it to call. Will replace board. Thank you!0
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