- Your water temperature isn't right. If a TMV valve stops working correctly, then you may notice that your hot water suddenly starts to run hotter than it should. ...
- Your water doesn't flow normally. ...
- You have leaks or drips.
What happens when a mixing valve fails?
Any mixing valve can allow a cross-over to occur should they become defective. A defective mixing valve will allow a cross-over of hot and cold water, even though there are no visible signs of trouble or leak. A plumbing cross-over can cause a complaint such as 'water not hot enough'.