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ONE of seven zone does not work

I have a hot water boiler. I am 100 % sure there is no frozen pipe because we are just leaving the summer season and we haven't have any temp bellow 58F. that zone is one of two hydronic system.
What I have try so far.
when the T-stat call for heat boiler/circulator/zone valve go ON but the pipe at the hydronic unit are cold.
I shut off the boiler and close all other zones to bleed the one trouble zone.
At the boiler feed and return pipes are really hot but no at the hydronic unit.
Any other suggestion?
Thank you for your help.
expressjoel

Comments

  • STEVEusaPA
    STEVEusaPA Member Posts: 6,132
    It's hard to guess without looking at it....zone valve not opening, control not sending power to zone valve, air, not enough fill pressure, not bleeding properly, shut off valve to radiator closed/broke, water leak, circulator not working...
    steve