no end switch

[Dud]

We have a newly installed Navien combi system. A Taco zone controller is used to provide 6 zones. There are 3 "manifold" locations with 2 zone connections. At each of these locations there are 2 V8043 zone valves with individual 3 wire thermostats. The problem is that the cable back to the boiler only has 6 wires. Ideally, I should have 3 for each thermostat and 4 for each valve, or 14 wires for the 2 zones. The Taco would sense the thermostat call for heat, and activate the corresponding valve. The end switch would be detected by the Taco. The Taco connects to the boiler to fire the gas and turn on the circulator. But I'm short on wires. It dawns on me that the thermostat itself can activate the valve. So I can make it work with just 3 wires to each thermostat (and connect the stat W and C wires to the valve). But I don't have wires for the end switches. The Taco can turn on the pump and boiler. Can something bad happen by "assuming" the valve has actuated because I can't connect the end switch?

Thanks.

 

[Fitter30]

What model of taco controller? Three wires for thermostats 3 wire for common? Honeywell zone valves only pull .3 amp. Thermostat normally good for 1 amp max. I'm missing something. Usually t stat wired to controller, controller to zone valve and to boiler. The zone valve end switch is used to operate boiler when a controller isn't used. 3 wires to stat, controller to boiler and controller to zone valves and controller to pump.