My sisters new home addition has an issue with the new shower. After a few months of use the shower now has low hot water pressure. the cold pressure is fine, and the hot pressure everywhere else in the old and new portions of the house are fine.
Info:
-As you turn on the shower (i.e. Cold water only) the pressure is fine. It drops as you rotate the valve mixing in the hot water.
-Old house and new addition share one hot water heater.
-New addition plumbed with 3/4" PEX.
-Valve is a MOEN PosiTemp model.
-Home has hard water (no softener yet) which I have heard can effect pressure balance valves.
My only idea is that it could be a bad pressure balance cartridge. It seems unlikely though after only a few months even with the hard water. I would think it would either be bad out of the box or bad after a few years, but a few months is an odd time interval. I also would think that if the plumber didnt flush the lines fully that the gunk would have caused the problem immediately after installation.
Any ideas?
Note: I know this is probably covered under the home warranty - I just like to know what the probem is ahead of time so I can be informed.
Info:
-As you turn on the shower (i.e. Cold water only) the pressure is fine. It drops as you rotate the valve mixing in the hot water.
-Old house and new addition share one hot water heater.
-New addition plumbed with 3/4" PEX.
-Valve is a MOEN PosiTemp model.
-Home has hard water (no softener yet) which I have heard can effect pressure balance valves.
My only idea is that it could be a bad pressure balance cartridge. It seems unlikely though after only a few months even with the hard water. I would think it would either be bad out of the box or bad after a few years, but a few months is an odd time interval. I also would think that if the plumber didnt flush the lines fully that the gunk would have caused the problem immediately after installation.
Any ideas?
Note: I know this is probably covered under the home warranty - I just like to know what the probem is ahead of time so I can be informed.