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I assume the helper pump on the return line (the fifth pump on the other side of the boiler) runs if any of the zone pumps are running. If the living room zone pump has failed, the helper pump will force hot water through all four zones. To test this, temporarily disconnect power to the helper pump. Since the system is new, it seems more likely that the ...


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Assuming the thermostats are working, you may be getting residual heat once the thermostat turns off. Do the pumps have speed controls? Many pumps have LOW, MEDIUM, and HIGH settings. A lower setting may avoid spikes in temperature. Also, many pumps have mixing valves near them that control the temperature of the water being sent to the radiators in that ...


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I take it that in the box there are 2 x "Heat Links" (HL for short.) One will replace the HW (Hot Water) thermostat and the other is for the room thermostat CH (Heating) If your boiler is "Open Therm" compatible it will most likely work with Nest, if not "Open Therm" don't worry (yet)as it may still work.



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