A more frustrating and difficult-to-fix cause could be a blockage in the pipe, such as from debris that made it inside from the water main, or corroded metal that's flaked off the inside of the pipe. If only cold water is affected, that would indicate the blockage is not outside, as the hot water remains unaffected. Accordingly, why is my cold water tap stiff?
The rubber O-rings inside your faucet wear out from age, exposure to air and exposure to heat from the hot water flowing through the faucet. As the faucet's seals wear out, the faucet does not turn as easily since the hardened O-rings create an increased amount of friction inside the faucet.
One may also ask, why do taps stop working? If you don't find any leaks, a blockage in your plumbing pipes could be the cause of your tap troubles. Clogged pipes are usually due to sediment build-up, which stops the flow of water. This build-up may be from limescale, rust, debris or heavy metal deposits.
Similarly, you may ask, how do you make tap water colder?
Start with a glass of cold tap water as cold as you can get it. Then turn the water to as hot as it can get and pour another glass, being careful not to burn yourself. Measure the temperature of each. What is the difference between the hottest and coldest water your faucet will produce?
Will an airlock clear itself?
Persistent air locks can be cleared using mains water pressure. You need a garden hose connected to a mains pressure cold tap (most garden taps are mains pressure). There are two ways to flush the air out.
Related Question Answers
Why is only my cold water working?
Try Cold Water If the cold water seems to flow fine, but you can't get it hot, then your water heater is probably malfunctioning. Heater issues can happen for a couple reasons–it could simply be turned off or unplugged, or sediment buildup could be blocking the heating element. The heater might even be leaking. How do you loosen a stiff tap?
And in some cases, you'll need to use a small flat head screwdriver to pop off a cap on the top or back of the faucet that hides the screw. Once you find the screw, get the appropriate screwdriver (usually a Phillips head or a small Allen wrench) and turn the screw counterclockwise to remove it, as well as the handle. How do you loosen a tap handle?
If it's stuck, wrap a rag around it, give it a few light taps with a hammer and try again. Squirt a few drops of penetrating oil or spray lubricant into the space between the handle and the valve stem. Wait a few minutes, then tap the handle and try pulling it off. Place a scrap piece of wood on the faucet body. Can you use wd40 on taps?
If you have hard water, descale the tap and spray on a little WD40. If you have indirect water supplies, such as a hot water tank, you'll need to make sure their valves are also closed. Turn on the tap to release any remaining water. Put the plug in the sink. Can I change a tap washer without turning the water off?
Even if you do manage to change the washer without turning off the water you really need to locate the stopcock. If you had a burst pipe your house would be seriously flooded. What is the temperature of cold tap water?
Normal temperature of tap water depends upon what kind of water one want. For cold tap water it should be around 7 degrees Celsius while for hot tap water it should be around 50 degrees Celsius. How does faucet water get cold?
Faucets are supplied with water from two different water lines, one cold and one hot. The hot water line usually comes from a heat source called a hot water heater. Turning only the cold water handle will give you only cold water directly from the cold water line. Is it safe to drink water from bathroom tap?
Your bathroom tap water is perfectly fine to brush your teeth and to wash up. Is bathroom sink water the same as kitchen water?
2 Answers. All water coming into your house comes from the same single source, so unless you have two separate storage tanks for your kitchen taps and bathroom taps (highly unlikely) then the water will be identical. Is toilet water the same as tap water?
Toilet water tastes just as good as bottled water and is better than tap water, find scientists in first ever 'blind' test. Recycled toilet water is just as tasty as bottled water, according to a new study. Why is my hot water pressure less than my cold?
The leading cause of low hot water pressure is typically sediment, rust, calcium deposits, and other debris that is either in the plumbing lines or the faucet itself. If you live in an area with hard water, again, it is likely that your pipes or faucets are clogged. What happens if boiler pressure is too low?
Boiler pressure is incredibly important because it helps to keep the water in your home warm. If the pressure on your boiler is too low, then your central heating may not work, and if it's too high, then it will be under too much strain and could also be prevented from working. Is low water pressure dangerous?
Low Water Pressure is not necessarily a dangerous condition, but may result in inconveniently low pressure to your water fixtures and may be a sign of problems in your home water system. 
