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Relay Activates pump for unknown reason?
Radiant floor heat. Wirsbo two-wire Thermostat. Four Wire valve bodies. Taco SR504 switch relay.
For some reason..about a week ago, one zone decides that the circulation pump needs to turn on and run but the valve remains closed. I can open the valve both manually and by the T stat and the audible click lights up the orange lights on the Uponor Zone Control module. The red light "D3" remains lit no matter what...at all times. Any leads on how to stop this issue or what is causing this? Faulty valve? This is on an oil fired boiler unit and prior to a week ago, the system would only fire off for domestic hot water use- no need for floor heat during this time of year. Thank you all.
***red light can be seen in one photo without flash****
Are thermal valves better than motorized valves or is there a better one out there?