Hot water flows from a cold tap - reasons: what to do?

It happens that you turn on a cool water in the morning with a desire to cheer up and wake up quickly, and boiling water flows on you. It is good when it will do without thermal burns, otherwise it is not for long to coordinate the skin for long. Why do such unforeseen and very unpleasant moments become possible and how to eliminate them?

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As often happens, the causes lie in two planes: technical and personal. In other words, this can be a possible marriage of plumbing equipment itself and elements of the water system, or ordinary human “slaughter”.

Why is hot water flowing from a cold crane: what's the danger?

So, hot water flows from a cold crane because:

Admitted inaccuracies and errors when connecting plumbing equipment. It is most often about the shower cabin, or rather - errors in its assembly. This happens when the booth is installed independently, without the participation of a specialist.
Often the problem is also often that initially There was no connection of the check valve of the water heating tank, Then the fallen pressure due to the open ice water of the neighbor is compensated by hot, arising from you from the boiler.

Incorrect operation of the cranes. If you block the shower crane, and not the mixer, then the stoves of cold and hot water in a single system begin to vary and the “transmission” effect occurs, which serves as the reason that cold water “heats”.
The mixer itself is faulty. A gasket or an oil seal may be worn out, the body is dilated, and the presence of the initial factory marriage, for example, in the form of a non -compliance of gaskets in size.
Possible errors when connecting wiring During the replacement of risers.
The boiler is incorrectly installed Or it turns on at a time when the work of the central system for supplying hot water supply occurs.
A malfunction of the locking valve of the pipe.

First of all, constant influences of high temperatures on which the elements of the system are not calculated. As a result:

Flexible supply hoses going to the mixer can break.
The mixer may fail.

The pipeline can be clogged, and it is not always possible to determine in which place the blockage happened, which entails the need to purge the entire pipeline.

If you do not have a check valve, and the transmission occurs for this reason, you consume a much larger amount of electricity, since in this way you serve hot water and the entire riser.

Find out if your neighbors were installed by bidet or shower. It is possible that installation was incorrect, in particular, there are no check valves.
If hot water turned off before this, check for yourself and ask the neighbors to check if the valves are blocked on a boiler. Otherwise, it is likely that into a cold crane from someone's unlucky boiler Hot water may come. And in hot - as expected, the one that is served centralized.
You can try to avoid such a situation, refusing centralized security with hot water, installing a boiler.

Hot water flows from a cold tap: what to do?

You can install the check valve not after the counter, but in front of it, at the site of the input of water pipes in housing. This will solve the problem if it is precisely this.
Hot water flows from a cold tap due to the mixer. Has the gasket worn out? This more often happens with semi -turners or mixers, in which there is also a shower switch. It can be found precisely when it is blocked by the water, which was discussed above. You should start the replacement of the gasket with a complete overlap of the flow of water into the room, and then, having removed the tap and a cap of the crane, unscrew the crane-boux, which is replaced with a new same type.
With wear of the oil seal (which happens extremely rarely), we also get to the crane boux, or rather, to the hexagonal nut on it. Try to twist it the same, and if it does not work, then unscrew it and replace the stuffing box.
A worn mixer does not make sense to repair - it simply needs replace.

Well, and in case factory marriage (if this is not an elementary drying gasket), you should make a return to the trading one and get in return either money or a new mixer.
In one -leaf joystick mixers, you need to change the cartridge. To do this, blocking the water, also, removing the parts alternately, we get to a large nut, which must be unscrewed, extracting the cartridge from under it. By replacing it with a new, similar sample, you can assemble a crane.

If you are an amateur in technical matters, it is better not to engage in repair and replacement yourself, but to invite a specialist for this.
First, feel the pipe where it is located valveresponsible for the flow of water into the room. If she hot to the touch, then do not engage in amateur performances-a problem somewhere outside, and only a qualified plumber can detect it. If the pipe is cold - check if everything is in order with the mixer, and if there are no problems, contact the neighbors with whom the riser connects you, even if they check the taps.
The same check can be carried out with locking valves located in the basements or on the roofs. As an option - close shut -off valves. If it is serviceable - from the tap of cold water, as expected, it will flow cold, well, and if it is hot, the mixer is junk.

Besides, Observe the water meter, whether he is spinning in the opposite direction. If this is the case, then you need to block the water with a locking tap, and then check again how the counter works. If the movement in the opposite direction has stopped, it means that the problems should not be sought by the neighbors, but in their own apartments. If the counter is not installed in your apartment, then close the shut -off valve and put a cold stream from the mixer.
Now Close and feel the pipe. When it is heated - look for a problem at yourself, if the pipe remains cold - it means that the reason should be sought with the neighbors.
To understand who exactly, repeat this process. When heating the upper segments of the riser - we are talking about the neighbors from above and, accordingly, the lower - neighbors from below.

Hot water flows from a cold tap - why is it so important to eliminate the breakdown?

Why is it so important to eliminate the breakdown? The point here is not so much in the inconvenience caused. It is known that the temperature of the water installed according to standards due to many calculations. In particular, we are talking about sanitary safety, since mixed water in the system can become the soil for the propagation of bacteria that can cause quite serious diseases.

If you do not correct the situation when hot water flows from a cold crane, it is possible to fail plumbing equipment, including a meter or a toilet tank that does not provide for operation at high temperatures.

Well, of course, no one did not cancel the rules of the hostel, When the malfunction of your equipment causes inconvenience or even the risks of your neighbors. Moreover, for everything that is in your apartment, including And pipes with cranes, you answer it, and not the operational company.