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:confused: I have 2 zone steam boiler with honeywell mechinal zone valves controlled by a three wire thermostat zone valves need power to open on call from thermostat as well as power to close...

Try to adjust boiler temp settings to lower levels... your water will circulate longer at a lower temp to reduce the expansion and contraction of the base board pipes... if you have a high limit......

Easiest way for a home owner to match up is with make and serial # of heating unit or remove entife fan assembly for transportation to supplier for your brand