I have had my Delta bathroom faucet about four years. The hot water side drips. Can not get it to stop. It is one faucet with hot and cold handles with all sitting on a small platforum. The platforum is sitting on the sink. Brushed stainless. Can't find a serial number. What do I need to do to get it replaced. I know it has a lifetime warranty.

If you notice right below the handle,there should be a small opening where ,by using an allen wrench you should be able to remove handle giving access to the stem retaining nut ......CAUTION... be sure cutoff valve is turned off(both hot and cold cutoffs.... under lavatory sink before removing..........unscrew retaining nut and remove stem.....hope that helps......

You have a obstruction in cold side turn off both cold and hot water to faucet then disassemble cold side(take note of how you take apart it must go back correctly) slowly open cold water stop to see if you can dislodge obstruction(use a towel over cold water handle assembly to keep from water shooting everywhere).

Check the water supply lines to the shower at the faucet handles. If the fitting for the hot water line connected to the handle is loose, it can twist and kink off the water supply further down the line when you turn the faucet handle. I'm not exactly sure how this could be relevant otherwise, but under normal design circumstances this type of scenario with your shower wouldn't matter for other faucets.

If your Delta RP17453 Pull-Down Diverter Tub Spout stops dripping after 5 minutes, your ok. If it never stops dripping, you need to replace delta faucet cartridge(s) behind the handle(s). This is were the water turns on and off and stops the water flow to the tub spout.

Delta faucets are some of the easiest to repair, and parts are usually available at any hardware store or home center. If you have a two handle faucet, replace both delta seats and springs and stems. If you have a single handle Delta faucet, replace the entire cartridge.

Yes, debris from water heater replacements often breaks lose and gets stuck. The problem could potentially be anywhere between water heater and the faucet. The faucets shut off valves or the Delta faucet cartridge itself. Turn the hot and cold water valves off under the sink and disconnect the water supply lines from the faucet. aim the water supply lines into a bucket and turn the valves on one at a time. If there is a significant reduction in the water pressure and volume on the hot water side, you need to replace the shut off valve. If there is no reduction in water pressure, you need to clean and/or replace the Delta faucet cartridge. Contact Delta to receive free replacement parts.

could be dirt in cartridge.Could be the limit adjuster in the handle.I'd take the handle off and manually shut it off.But probably dirt or debris in cartridge

First isolate which side (hot or cold) that the leak is coming from by turning off one or the other valved under the sink. once you know if its the hot or cold faucet, then shut off all water supply to the sink and remove that faucet handle with a very small allen wrench ( there should be a set screw in the side of the handle) inside of the valve (handle) there will be little rubber seals like o-rings that are worn out and need replacing. you can purchase them at home depot or a hardware store

bad faucet...get new at lowes or home depot

change the cartridge it is bad or defective.

Yes, you are on the right track, but Deltas use a fancier kit inside them. It is quite a bit pricier than an O ring, but will solve the problem. It is not hard to install at all.