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Re: no cold water only, just tepid to hot on...
Hi i think the problem is the temp has not been adjusted to your requirements as it will come factory set at 43 deg c so you will probably need to get it adjusted by the guys who fitted it as it wiil need to be set by a professional.
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If I understand correctly, you have single handled shower faucet. Normally there is a wait for hot water to arrive at faucet. But now hot water is already at shower faucet.
Single handled faucets have a mixing area inside valve where hot and cold come together before going into sink. This mixing valve can have crossover where the hot and cold can pass through to each other even when faucet handle is off. When single handle faucets get old, this can happen. How it happens: For example another faucet is turned on inside house, and pressure differential between hot and cold causes hot water at shower handle to pass through mixing area and into cold water line. So if another faucet has been run, then that lets hot flow to faulty single handled shower faucet. To confirm this is the problem: turn on other faucet and put ear against shower faucet to listen for moving water. This condition may also signal there is a water leak. The problem is not harmful, but will draw cold water into water heater each time, and is energy wasteful. Replace faucet or have plumber repair problem.
If this is a newer valve what is probably happening is the valve is a scald guard valve and is shuting itself off when it senses no pressure on the cold side. I don't have a lot of experience with am. std. valves but I'm sure you can get instruction on line to set heat setting on valve higher. Thank you.
there is a splined adjustment just under the handle of the 3175.
you need to remove the handle, usually held on with an allen screw
once you remove the handle, there will be a black "stop" held on with a screw, remove that, but remember its position.
once that is off you can adjust the temperature. there will be 2 white pieces, one has splines, you can move this counter clockwise one or two notches at a time untill you reach your desired termp.
be careful not to go too much, even though these are an anti scald valve, you are letting more hot water through it.
Pull the trim off of the valve and you will see a 1 inch diameter flat screw, unscrew that and clean it out and try it again. If rinsing it doesn't work you may need to replace it. It is called a balancing caulk.
it sounds like you need to up the temp on your water heater so that you are mixing more cold with the hot .be careful hot water can cause burns if valve is 4 years old then it has a limit stop do not set above 120 *you will need allen key and thermometer to check temp
Pleae do not follow smthbrother's advice. It is just a simple problem with the valves, nothing to stress about. I am a plumber by trade and see things like this all the time. If you post the name of a pic of the valves I can tell you what you need to buy and how to fix them if youwant to take this on. If you feel this is something you might not want to I can figure a price up to repair it..this will give you an Idea of what it should cost when you have someone come out to repair it so you dont get taken. Repost if you need anything or you want me to walk you threw it.