“This was a simple, inexpensive fix. After 15 or more years, my first floor zone valve was inconsistently failing to respond to thermostat stimulus. The same thing happened 2 years previously to the second floor valve so I understood what was wrong. After turning off the furnace switch, I removed wires from the old valve power head. I removed the old one from the pipe-attached valve with 1/4 turn to the left”
“Bought as replacement for a Taco zone valve which had burned out. I have had a number of Taco zone valves fail over the past ten years or so. In my opinion their electrical quality is slipping and if my job was being installed new, I would probably use Honeywell zone valves instead of Taco”
