Leak in baseboard?

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MarkLamberti

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I have a boiler with 4 zones (one of is indirect fired hot water heater)


I finished my basement a few years ago. I put in baseboard using pex for supply in a few spots i ran the pex behind the wall and could not get at it with the pex tool so i used sharkbite fittings.

This winter when the basement zone was running i ran into issues with the hot water loop becoming air bound. I assumed that there is a leak in the baseboard loop i put in.

I finally got around to attempting a fix. I isolated the zone, opened up the fast fill valve and put the pressure up to 100psi. It droped shortly to 90 psi. The problem is i looked at all of the sharkbites and other fittings. I cant see any leaks.

Advise? How is this possible? Is there a leak behind the wall?

thanks
mark
 

Dana

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If it stabilized at 90psi and didn't drop from there it could just be the PEX flexing or changing volume due to temperature drift. If it just keeps dropping you have a leak.
 
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