Re: Hydro Air System
The good news is there is one zone that is working which will provide assistance for some basic troubleshooting.
You've already had the controller open which means you are probably familiar where the thermostat wires are attached on the circuit board terminal strip.
I'm guessing that the first floor thermostat is wired to #1 terminal and the second floor thermostat wired to #2 terminal.
Since the first floor zone works remove the thermostat wires for #1 ..... be sure to notate and mark which wire goes where before disconnecting .
Do the same for #2 ..... once you have notated and marked the wires attach these in the place for #1.
Turn up the temperature on thermostat #2 .... this should light up the #1 LED and turn on the zone #1 circulator.
If this doesn't ...... this means there is likely a problem with the wiring or the thermostat associated to #2 .
If it does .... there is a problem more likely with the ZT controller.
Don't forget to reattach the #1 and # 2 thermostat wires back to the original locations after you're done with the testing.
If you want to verify the zone #2 circulator ......with the thermostat wires in the correct location ..... disconnect the circulator wires from # 1 and move #2 to that location.
**warning .... be careful since this is 120 volts disconnect power to the ZT controller before doing this.
When thermostat #1 calls for heat #2 circulator should start.
If it doesn't ... there is a problem with the circulator or it's wiring.
Hopefully this makes sense and helps.
"" an ounce of perception -- a pound of obscure "