Occurred after water had been turned off (for plumbing in washing machine) and then turned back on. Shower sprayed cold water whether shower on or off or any buttons pressed. Seemed to be leaking slightly from component at bottom of unit (not the heating reservoir).
Had to turn water off at mains.
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Re: continuous flow through shower even when off
You probably have galvanized pipes still, each time you turn off the water bits of rust will break loose and travel throughout the system , which in turn clogs , or holds open valves,, what you need to do, ( or have someone do for you) remove those valves that have been effected, and clean them out( you can do this easily by just turning on the main slightly with the valve out ,, But be ready for a wet mess ,, do it quickly and for just a short burst,, you'll more than Likely see that the toilet fills slowly since they get clogged also
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What is happening is that your cold water flow is greater in volume (gals per min) than your hot water. So when you open the cold water it is mixing with the hot water inside the faucett or shower plumbing and actually reverse flowing back into the hot water heater plumbing. The reverse flow slows the water flow sensing turbine inside the heater and it is thinking that there is not any water flow. (There isn't actually due to the equalization of water pressure when you open the cold water faucett) Since this is a safety feature of the tankless heater to keep it from overheating, it shuts off.
Somewhere in the hot water plumbing there is a major restriction. It may very well be the internal plumbing of the tankless hot water heater or the flow detector design.
There are 2 ways to correct this. The easy way would be to restrict the available cold water flow. You can do this by installing another shut off valve inline with the cold water plumbing and just not open the valve all the way. You would have to adjust the setting so that the hot and cold water can be on at the same time and the hot water heater stays on. The hard way is to locate the hot water flow restriction and eliminate it.
It is possible.... if you have a flow restrictor in a shower head or a screen in a faucett areator that they are partially clogged. Clean any flow restrictors and screens then see how the hot water heater performs before you start modifying plumbing.
The automatic clothes washing machine counts on a pressured water system - like what is provided in a town / city or from a well that has a pressure system to deliver water at pressure like when you open a valve for a bath tub, sink or shower.
You need to have a plumber provide valve/faucets for both hot and cold water. The valves are sometimes called a "hose bibb" with a threaded end that the hoses connect to and then are connected to the back of the washer. When the hoses are connected and the valves are open, the automatic washer will open a solenoid valve when the time is right to allow water to flow in, then closees. Some owners keep the hose bibb valves open forever after they connect the washer, others close the valves after they are done washing all loads for the day/week.
You will also need a drain provided that connects into the house plumbing. The Whirlpool Duet provides the drain hose from the washer which drops into the pipe the plumber provides. It is important that the drain pipe allow air to move past the washers drain hose, to allow proper draining.
Hope that helps. Please post back how things come out, OK?
Sounds like your outlet at the top has clogged with grit/dirt. Turn the shower off, remover the entire shower head hose from its base (where it screws into the wall or pipe. Turn water back on. If you get a steady flow (as you should) the problem is isolated to the shower head/hose. Detach the shower head from the hose and clean the screen inside, attach hose back on first, try water again, if this flows then your blockage is in the head itself. After removing and cleaning the screen inside the shower head, reattach and run water, this should fix your problem, if not, you may need a new shower head. If the water will not flow to the outlet pipe alone, either your shower switch is broken or you have a serious plumbing problem.