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Bad check valve?

JohnnyCB
JohnnyCB Member Posts: 25
in THE MAIN WALL
Hi All,



So, I posted a while ago in this thread about some mods I did to add a couple rads to my baseboard system: <a href="http://www.heatinghelp.com/forum-thread/141938/Is-this-OK-Service-bypass-for-radiators">http://www.heatinghelp.com/forum-thread/141938/Is-this-OK-Service-bypass-for-radiators</a>



Everything works, but I noticed something weird this morning:



Both heating zone's thermostats are currently turned off.  When I came downstairs this morning, I heard the baseboard rads "pinging" like the were getting heat.  I put my hand on one, and it was slightly warm, but not really hot like they get when on.  I confirmed the therms were off.



Now, the hot water tank was probably calling for heat because my wife was in the shower at the time.



Does that sound like a bad check valve in the downstairs zone?



Thanks for any insight,



-John
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