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Hi my name is ***** ***** I have been in the plumbing field for 20 years. I will be glad to help you today. Do you know what model valve it is?
Yes, looks like Moentrol by Moen. Pull out to turn on and off and left and right for temperature?
Turn the water off and remove the handle and cover plate. You will see a big flat head screw to the left of the handle stem. Remove that and that is the pressure balance cartridge. Remove any debris from it and take it apart and grease it with plumbers grease. Do not use petroleum jelly or any petroleum products. It must be plumbers grease or silicone grease. The pressure balance cartridge is sticking.
I just posted the answer just at the same time you replied. See it?
The cartridge that the handle connects to is different. There are two cartridges on that one. One for temperature control and volume control and the other is just the pressure balance cartridge. The one behind the flat head screw is the one that is causing the issue and yes you will have to lubricate it.
I see. That is an old one. The mixing cartridge itself will have to be replaced. If you call Moen they may send a new one for free. 1800buyMoen
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