There is only cold water coming from the shower.I tested the main heater relay and no power was going through, Is this a common problem and is there anything else I should testor is there another reason for the relay not to energise
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Shower heads have flow limiters installed in them. This means the water heater cannot sense the water flowing and therefore it wont come on. Take the shower head off and look in the end for a piece of plastic that is in the swivel. Remove it. Then put the shower head back on.
It sounds like 1 of 2 things to me. I will start wit hot water heater. The first test for the water heater is to have someone run the hot water while you hold the hot and cold pipes and see if the water is coming out of the water heater cold when the shower goes cold. Of the water heater is cold coming out then the problem is in the heater. ether a lower element is bad or the dip tube is broken at the top of the tank. if the hot water heater continues to put out hot water when the shower goes cold then it has to be the mixing valve for the hot and cold mix at the shower and that valve will have to be repaired or replaced. hope this gives you a good start. let me know if I can help further.
almost all tankless water heaters have this problem. I would install a small "buffer" tank. for example a small 5 or 10 gallon electric water heater will "mix" the water so that it doesn't come out of your shower cold, or scalding hot.
the instructions that came with your water heater should have a diagram of how to do this. if not let me know, I can send a copy.
the electric water heater acts as a mixing station.
the problem with most tankless heaters is that the water coming in is cold, average 60* and the water coming out is average 120*. sometimes the flame in the unit can't keep up when using large amounts of water, and you will get cold spots. when this happens, the heater will sense this, and then tells the flame it needs more BTU's, so then you will get extremely hot water.
the buffer tank will fix this by mixing the water before it gets to your shower and will give you an even water temperature.
Your heater is on? Do you regularly drain off sediment?
Have you contunity tested your elements (power off)? Volt tested the same (power on)?
Has anyone fooled with the thermostat?
There is the possibility the dip tube (cold water going in) has broken off and instead of sending the cold water to the bottom, the cold goes straight from the cold water entrance pipe to the hot water exit pipe. Normally, one would expect cold water to sink and hot water to be on the top but, when you are drawing water off the top, with a broken dip tube, the water travels the shortest distance required, thus, your luke warm water.
I hope you can find your trouble by following one of these hints.
The plumbers screwed up when they installed your showers. There are two connections on each shower. one for hot and one for cold. they connected the two hot water lines together with a T fitting and then ran a line to the main hot water line and tied it in. Then they connected the two cold water fittings with a T and ran that line to the main hot water line and tied it in there instead of into a cold water line like they were suppose to. This is the only possible logical solution to this problem. They tied your cold water connections to both showers into a hot water line instead of a cold water line.
There is something caught in the hot side of the faucet manifold (main faucet body). You have to remove the trim and guts to access it. Use a flash light and look inside. Hopefully you can find the object. Oh by the way, you need to turn the water off to the whole house to do this. If you don't see anything have someone turn on the water slowly with the valve out of the manifold to rinse out the pipe leading to the valve body. Hopefully it will remove whats in there. If what you see is a white looking material that is stiff but brittle, then it's from the water heater and the water heater needs to be replaced. Sometimes there can be small stones that get "washed" into the lines when the main is worked on within the area of your home. But most likey it's from the water heater. Good luck! Don't forget to turn the water off before you remove the faucet guts.
I found a way to get warm water in the shower, but I'm not sure it qualifies as a solution. After trying everything else I thought that maybe when I was feathering the faucet in the shower toward the cold side so I would get warm water that at a certain point it blocked the flow on the hot water side enough so that the sensor in the hot water heater sensed there was no demand in the line and it shut the water heater off. To test this, I went to the kitchen and turned the kitchen sink faucet all the way to the hot side and then turned it on so that I got a small flow of water. I waited for the water to get hot to be sure the hot water heater was working. Once it was hot, I left it running to keep demand in the line and then I went to the shower and turned the faucet on. When the water got hot I started feathering the control towards the cold side and soon I had warm water. So I think I'm right in that the sensor in the hot water heater was shutting the water heater off when the demand in the shower was lowered to a certain point when I was trying to adjust the water temp in the shower.
So now I can get warm water, but it means I have to leave the hot water running at another fixture in the house to create a false demand in the system so the hot water heater doesn't shut down. Is there a way to adjust the senor in the hot water heater so that it will stay on when I'm using the shower only, so I don't have to waste water by running another faucet when I want to take a shower?