I have a 3-zone system, with 3 Honeywell Zone Valves V8043F wired in series and 3 thermostats. The problem is only 1 thermostat is causing the boiler to fire. The other 2 thermostats correctly open the valve, but do not fire the boiler.
I measured the voltage on the 3 valves with the thermostat off and on. When the good valve activates, the voltage is 24v on the thermostat wire and 0v on the endswitch (all 3 valves go 0v on the endswitch from this). The boiler is firing at this point.
When the bad valve activates, the voltage is 24v on the thermostat wire and 24v on the endswitch. The boiler does not fire. The same goes for the second valve. The bad valves do correctly open the valve. I hear the click. I even watched the microswitch get pressed down by the motor. Yet the voltage on the endswitch stays at 24v.
Does this mean the two valves are broken and should be replaced?
(thermostat wire/endswitch)
I measured the voltage on the 3 valves with the thermostat off and on. When the good valve activates, the voltage is 24v on the thermostat wire and 0v on the endswitch (all 3 valves go 0v on the endswitch from this). The boiler is firing at this point.
When the bad valve activates, the voltage is 24v on the thermostat wire and 24v on the endswitch. The boiler does not fire. The same goes for the second valve. The bad valves do correctly open the valve. I hear the click. I even watched the microswitch get pressed down by the motor. Yet the voltage on the endswitch stays at 24v.
Does this mean the two valves are broken and should be replaced?
| Bad | Good | |
| Off | 0v/24v | 0v/24v |
| On | 24v/24v | 24v/0v |
(thermostat wire/endswitch)
Honeywell zone valve V8043F not firing boiler, is it a bad valve?
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