Zone valves control heat delivery to different areas in hydronic systems. Christian Science Church in South Lake Tahoe reported a zone valve remaining open and continuing to pump heat despite thermostat shutdown signals. Riley Plumbing Heating And Air diagnosed the issue during a Saturday service call. The valve actuator had failed in the open position. Zone valves contain motorized actuators that respond to thermostat commands. Internal mechanical failure prevents proper opening and closing. The stuck valve allowed hot water to flow continuously through that zone regardless of temperature demand. The crew replaced the failed actuator and tested operation through multiple heating cycles. The zone now responds correctly to thermostat signals. Stuck valves waste energy by delivering unwanted heat and prevent proper temperature control in affected areas. Replacing actuators is more economical than ignoring the problem and overheating spaces. Learn more about boiler repair services for commercial and residential hydronic heating systems throughout the South Lake Tahoe region.
