The thermostatic mixing valve (TMV), bridges hot water from your system with the water that comes from taps and showers. There are two ways it keeps your hot water system safe.
It allows you to store water at an adequate temperature to prevent bacteria growth. It also regulates the water temperature.
The valve releases hot water when you turn on a shower or tap that connects with a TMV setup. It mixes hot and chilled water to achieve a temperature set by the thermostat set by a licensed plumber. Your water shouldn't heat up to the point that it can cause burns or scalding.
The TMV functions seamlessly when everything is in order. It might have problems, however, that stop it working as it should. What are the symptoms of a problem with your valve?
1. The water temperature is not right
When a TMV valve fails to function properly, hot water may suddenly become hotter than normal. If the TMV valve isn't able to regulate temperature properly, then it may not be able cool hot water enough to keep it safe.
But excess heat isn’t the only problem. Sometimes, the water may become too cold due to a malfunctioning TMV. Water may not be running at the correct temperature all the time. It can fluctuate between hot and cold. Sometimes, a bad TMV can affect the cold tap. This could mean that the tap is running hot or cold.
There are many reasons why water temperatures change. The valve could be blocked, or it may have moved out. It is possible that the thermostatic element has stopped working, or there may be a problem with the O-ring. You might also have problems with the flow or pressure of water through the valve.
2. Water doesn't flow as normal
Sometimes the first sign that you have a TMV problem may be a change in how your water is coming out of the tap. This is where you will typically see a decrease in flow or pressure.
Your water may start running slowly and sluggishly, for example. It is possible that the tap will not give out enough water. Your water may switch between running normally and at a lower pressure or flow.
These problems can be caused by many things. Sometimes water won't flow freely through a TMV because some of the valves have become clogged with scale or debris. Corrosion can also cause damage to older valves. A valve may not have been correctly fitted in the first instance.
3. There are leaks or drips
You might notice signs of trouble with your TMV if you are having problems. Water might seep from parts of the valve, or you might even see water on the floor beneath it. This could indicate a problem with the seal or corrosion.
A TMV can cause your shower to drip even if it is turned off. This could be because the valve is not in the correct position to shut off the water effectively. You may also have a problem with your valve's cartridge or seals.
Expert help is needed if you have any concerns about your TMV. If you don't have the right tools and knowledge, you shouldn't attempt to repair these valves. These valves are too crucial to be messed up.
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