Thanks for a great forum! I just found this while having problems with our 25+ year old Slant Fin Gas fired hot water radiator system with 3 zones. Yesterday we had no heat / pilot light didn't stay lit. I cleaned the thermocouple and got the system back up and running.
But 1 of the 3 zones doesn't warm up. I checked the zone valve and it appears to be working (the slide lever has no resistance when that zone is calling for heat / does have resistance when not calling for heat).
I even removed the zone valve mechanicals to see that the stem turns / is reacting to the motor (maybe something broke between stem and motor?). But that looks good (although valve stem turns only 1/8 of a turn? Seems less of a turn than anything I know.
Anyway, from other threads here, it might be a frozen pipe? There IS a room that has unheated garage on 1 side, outside wall on another. But heat was out for a couple hours yesterday AM. That's a laundry room and we ran dryer with vent going into room to heat it / some heat goes into radiator?
Seems weird that after 1 day of the other 2 zones working, that 1 zone is still not working. Is there anything else to do other than wait? I don't see water from burst pipe. I felt some areas of that pipe under laundry room and they are cold, but not numbing cold.
Is there a way to flush that zone? could it be a blockage? (yeah, what are the odds - blockage right when we have no heat?!).
If that's the only zone calling for heat, does that hurt the circ pump when it is running but can't circ the water? (the other zones get up over 70 and might shut off, while that 1 zone is in the 60s...).
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