Need some help with a forced hot water heat problem

Probably air bound.  Is there a valve (or two) that you can open to drain
the system?  Open it slowly and see if you get some air out.  Often , it
takes a couple of tries to get it all.

There *has* to be a bleed port to let the air out at the high point(s)
of the system.  On a ranch house I lived in the bleed valve was on the
furnace because it was the high point.  If you have searched every inch
of the lines and can't find one call in a plumber.

I have found that after the initial bleeding of air it is good to run
the system and bleed again and again and again.  It just takes time to
get it all out unless the system was installed *perfectly*.

I hope when you said "refilled the reserve tank with fresh cold water"
you weren't talking about the expansion tank.  They need to have a
certain amount of air in them.

Was this guy a general contractor who plays a plumber on TV?  Hot water
systems can be very tempremental if not handled properly.

Yes, that is my own ignorance in terminology...I meant that he
re-introduced fresh water into the system.

water going through my hot water system gives of loud sounds of flowing
water through the copper pipes. what causes this?

Jmilton posted for all of us...


Air in system - google it next time.
--
Tekkie  Don't bother to thank me, I do this as a public service.