Heat pump liquid line gurgling

[Cold Feet]

Is it normal for the liquid line in a heat pump system to gurgle near the interior coil when the HP is in defrost or cooling mode?

The noise is audible from 3' away when the HP is cooling in marginal air conditioning weather. When the HP is defrosting in 25 degree weather, the noise is loud enough to be audible in an adjoining rooms, through 8' of distance and a sheetrock wall.

If these details are significant, it's an R-410A system with a TXV on the interior coil.

Is this something I should get a service tech to look at lest the HP fail during the dead of winter? The noise does not bother me.

[davegreenlee]

It sounds odd to me, if it bothers you, Yes of course call a reputable Tech. Everyone who reads this knows your not gonna sleep well till you have some assurance your systems is doing it,s job properly.
Good for you!!!!!!! Preventitive and regular maintenance is as important as putting oil in your car, Smiles on your kids faces, and I,ll leave your wife outta of this.

[udarrell]

Is it normal for the liquid line in a heat pump system to gurgle near the interior coil when the HP is in defrost or cooling mode?

The noise is audible from 3' away when the HP is cooling in marginal air conditioning weather. When the HP is defrosting in 25 degree weather, the noise is loud enough to be audible in an adjoining rooms, through 8' of distance and a sheetrock wall.

If these details are significant, it's an R-410A system with a TXV on the interior coil.

Is this something I should get a service tech to look at lest the HP fail during the dead of winter? The noise does not bother me.
I suspect liquid is flashing, which would indicate low on charge, also could be non-condensibles in the system.

I know of an R-22 with a TXV that's doing that, but not that loud.
I checked the Condensing Temp (CT) & the subcooling was only one degree F, indicating low on charge, which would probably be causing liquid flashing.

The system also has low airflow through the evaporator coil.

Someone here should be able to tell you what that indicates with R-410A, which would be louder due to a lot higher pressure surge. - Darrell