Recent content by thegove

  1. T

    Caleffi Z-one actuator failures

    I too have had three Caleffi z-one switches (z151000) fail in about 5 years. They all failed the same way: Although the motor responds to the signal from the thermostat to open the valve, the control valve does not send the signal to the boiler to engage. The specs for the switch are at...
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