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If the water temp is fluctuating from very hot and cool the problem could lie with a blockage in the inlet to the shower, scale inside the heater can, shower hose needs replacing or the shower head needs to be cleaned The problem is a "slowing" of the water across the heating elements which causes the water to pick up too much heat
adjust ur anti scold the setting is set to low when single handle shower units are shipped they are set in cold mode for safety ur install/instructional paperwork explains such and also advises on how to adjust---remove handle and on shaft will see a blue and red plastic clips that are adjustable slide towards u and move red for more hot water test water continue till comfort level is reached for hot water
This has happened to me in the past and had exactly the same symptoms but with a different valve. Before trying the below, it may make sense to be 100% sure that hot water is definitely getting to the valve .. can you get access to touch the hot feed pipe to make sure that it is in fact the valve at fault.
The following could be the issue:
1. The shower valve has a bit of dirt or gunk in it and is unable to allow the hot water through. It can happen with a very small amnount of dirt and is a real pain as it requires disassemble of the entire valve assembly.
2. The valve has failed and needs to be replaced - This was the solution to mine and was also significant in terms of effort.
Hope this helps, if so please leave feedback, if not let me know and I'll try and help some more!
This model of shower control is a "balanced flow system." This means that water pressure from both sides of the control is equalized by the control.
There is likely something restricting the flow of hot water into the control.
You might try this......
Turn off the water suppling the shower (turn off the water main if nessacary)
Remove the cartriage from the control
remove any visable debris
briefly turn the water on (just a second at the the most) *** make sure the curtain or door is closed first as there will be alot of water coming out of the control itself... Be prepared to clean up some water
reinstall the cartriage
if this does not solve the problem you might consider replacing the cartriage
you might also find that Moen has more helpful info their phone # is 800-289-6636 they have been very helpful the few times i've called
You need to check the age of your water heater. If it is pretty old, it can be sloughing off debris that can get caught in the hot side of the faucet. You will need to turn the water off to the unit, remove the guts. While someone is turning the water on slowely, flush out the the valve. Take a flashlight and check for debris that is caught. I have spent a few hours digging out debris from water heaters before. After you have done this and your still not getting water, check the scald gaurd for the right temp. Typically these don't just "jump" out of adjustment on their own because they have a small retaining washer that holds them in place. I doubt it is the scald guard if everything was working just fine before. Plus, the bath faucet has the most flow than any other faucet in the house so this will be the first place that debris will usually travel. Good luck