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  1. lordofthering

    WeilMclain Ultra 155 - Banging Noise when Honeywell Zone valve is closed.

    Hi, Myself have replaced my existing old Wei Mclain UHE Two boiler/Indirect hot water system with new Two Weil-Mclain Ultra 155 which controls 13 baseboard Zones and 1 Indirect Hot water Heater zone using LEAD and SLAVE setup. LEAD is primary source and SLAVE will kick off if LEAD is running...
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