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Radiant heat zone not letting water flow
I live in Michigan, it's cold here, cold enough that my water line to my outdoor spicket froze and burst.
My house has 4 zones.
I have a Slant Fin Galazy boiler
I've had my walkout basement zone freeze (so I thought) in the past
The basement zone valve motor went bad
Upon receiving parts, I installed the new motor and a kit to adapt the new motor allowing the motor to be replaced without breaking the water seal. So when replacing this I had to open the system.
Prior to replacing and after replacing the part, I've not been able to get water to flow through the basement zone (by normal means, using the manual switch, or using the house water feed).
I've tried closing all returns from all zones and opening the system at the return of the basement zone but the house supply won't push water through. It does through all the other zones. I know the valve lets water out because I can back flow through the valve if I open the return of the basement zone. I've applied gentle heat everywhere along the exterior walls with small space heaters. It's been roughly 25-29 out the last two days. I had the basement up to 75 the last two days.
Do you think the zone is frozen?
If it is frozen, do you have any recommendations for thawing?
If it is frozen, and I can't thaw it, should I close that zone and leave the drain valve in that zone open to relieve pressure until it warms up outside and can thaw?
Is there anything else that could prevent water from flowing through the zone?
This zone flows from the boiler like this:
__ ____ ____ ____ ____ ____
|_____| |_____| |_____| |_____| |_____|
1 2 3 4 5
1. baseboard on interior wall
2. baseboard on exterior walkout wall
3. baseboard on exterior walkout wall
4. baseboard on interior wall
5. baseboard on exterior non walkout wall