I HAVE TWO ZONES UPSTAIRS AND IST FLOOR, BOTH ZOME VALVES STICK WHEN EITHER OF THE PUMPS GOES ON, THIS HAPPEN TWO OR THREE TIMES A WEEK. WHEN I SHUT THE FURNACE OF FOR A WHILE A THEN TURN IT ON EVERYTHING IS OK IS THIS A COMMON PROBLEM? OR DUE I HAVE TWO BAD ZONE VALVES?
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