Kitchen Faucet Problem

Are you sure you're not confusing the hot and cold faucet? ...try the other side, just to make sure....there are two other possibilities that come to mind, if it's an electric water heater, the lower element might have gone bad...or the pressure relief valve went off and is stuck open a bit....are you sure there isn't a separate water heater for the kitchen sink?

There is a single water heater for the home.

All other faucets are fine; they get too hot to hold your hand under. This one was fine 2 days ago.

I put the faucet in myself 2 years ago. I also installed a RO system with demand and supply pumps about a year ago and know exactly which is the hot and cold lines.

I also turned off the cold water valve under the sink to make sure there was no funny business.

The water does get slightly warm but no longer hot.

Well there is a possibility that that line is losing the heat by some means, say like the water table has risen due to heavy rains or something and that line is run underground or in the slab or something, and the water is capturing the heat on its way to the kitchen...?

Identify if the flow for the hot and cold water lines through this faucet are similar if not identical. Don't just guess at this, measure the time it takes to fill a gallon jug with each stream.

Nice head scratcher! I surprised the plumbing to your other faucets had a different enough flow resistance to allow the hot water to prevail.

Beware!

Depending on the configuration of the hot water system: leaks between the hot and cold water supplies can cause the hot water tank or hot water header tank to overflow.

A friend of mine had a hole coroded between the two feeds to a faucet like yours; every thing still worked OK but the hot water header tank was overflowing. It took him ages to figure it out.

I've seen it myself once when I connected a pressure washer to the output of a faucet like yours; I don't know how both feeds were turned on, but, the result was the same: hot water feeder tank overflowing. Fortunately my friend had recently told me his story so I figured out what was happening to me fairly quickly.

It could be that you have an Australian style faucet. Compared to American faucets, theirs may be topsy turvy with the cold handle on the left and the hot on the right. As crazy as this sounds, there maybe some logic to it. I've noticed that when I purchase a BonAir Durango to install in a customers house, the cooler is always packaged upside down in the box. In order to remove the cooler properly, the box must be flipped upside down in order for the cooler to be removed from the box right side up. . It may be possible that the coolers were packaged right side up initially, but during transportation from down under, the cooler flipped around going from the southern hemisphere to the northern hemisphere. Then again you may have one of those hot water faucets that have been largely replaced by hot/cold metering faucets that receive hot or cold water from a separate supply respectively. In which case the faucet may have malfunctioned due to a clogged valve, pipe, inlet screen or other issues.

Glad you found the problem.

For future reference, I installed 3 Delta bathroom sink faucets a few months ago and discovered that they had filters/flow restrictors in each supply line, in addition to a flow restrictor in the faucet assembly itself. My first thought was that you had a blockage in the inlet hose.

Assuming you have tested the cold side and it functions correctly, you have a problem with the hot side system.

1. If you have registered the faucet with Delta, do so now. They have a lifetime warranty and are extremely good about honoring it!

2. Even if you haven't registered it, call their 800 number and go to the technical help option. Explain your situation and what you have done. When he works out the issue and, if you are registered, the part will show up in your mailbox in about 3 or 4 days.

Most major plumbing suppliers have lifetime mechanical warranties and are very good about their parts replacements

Check if you have any non-return valves on the cold on any of your taps espechelly if they are monoblock taps with ceramic seats, try if you can to isolate the cold on all taps except the kitchen, if the problem stays the same then the fault is in the pipe work to the tap, It raises questions, Is the tap a monoblock with ceramic discs? could be the cold one is cracked, Is the hot & cold supply pressure equilised? Has the cold supply pressure been increased by the utility company? they sometimes do this to increase supply. Lastly shut the cold supply to the tap and test to see wether the hot is as it should be, if it is then you need to work down the system to eliminate any faulty valves. Just a thought have you got any Y connectors that connect to washing machine or dishwasher even a shower with a diverter valve.

Hey Iv'e just looked at the tap on the web, if your's has the spray head at the side I think that is where the fault lies, Isolate that spray then check your hot tap. We call this type of tap a deck mixer and as such cannot be leaking from the cold or it would come out the spout all the time, my bet is the spray valve, I'd put money on it.

Bazzer

Solution in #6

Without reading what others have already said, I would guess that you have a "mixer" faucet and the hot side has a problem, that will entail removing it and taking it apart.

Or you have no house mains inlet filter, and some garbage has bunged up the hot side.....

Solution in #6