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Re: adjusting the scauld guard on a shower mixer valve
Uue a 1/8" allen wrench to remove handle to access the dial that set's the mixture of water.Remember or mark where it is and remove and reinsert counter clockwise about a 1/4 turn to start to you reach desired temperature setting. Be careful not to set it at a hot enough setting to burn you.
Once dial in place slide handle on and turn on to check water temperature.
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I bet you don't drain your tank every year. It accumulates something a little like sand . it may have been low enough to "suck" up some of this trash into the hot water lines and then to your valve and shower head. I would start with the head itself a good long soak in vinegar. If you have a spare shower head or hand shower head, I would let it sit for a week. While you have the "tempory" head installed, you can find out if the valve has been affected. Hopefully not. But if it is still slow flow, the trash may have accumulated in the valve. If that is what it apears and you have been considering a new valve now is the time. You may be able to flush it out with a direct connected garden hose. A "reverse flush would be the first try.
You should have the ability to reach 185 degrees. As long as the Heater is capable of reaching 185 you should be able to process that extreme without a problem. The only reason you cannot get above 140 is because the valve is limited or defective. You may have to replace the shower valve to accommodate 185.
Your question doesn't give me much to go on, but, If you have installed a new mixer valve in your shower and you can't get water that is hot enough to come out, there is a reason.
All newer mixer valves that I'm aware of have what's called a non-scholding setting that is done at the factory. ( I believe some manufacturers explain how to adjust this, in the paperwork you got with the part, if there are no children living in the home.) This is a child saftey feature, and if you want hoter water, you may have to raise the temperature setting in your water heater.
if the water is that hot then lower [adjust] the temp of your hot water heater -if need to adjust the shower you can adjust the mixing by removing the handle and on the valve stem are the adjusting clips the red [hot] and blue [cold]plastic clips can move them around to adjust the mixing of hot and cold water
You didn't mention what model you have. Here is a link to their web site. You can download a manual, that has detailed instructions on how to adjust. You should have a thermometer to measure water temperature to adjust properly. Go to : http://www.groheamerica.com You can identify your model, and then download the technical product information. Also check the temperature of other faucets in the house to be sure they are getting hot enough, and not a water heater temp problem.