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Shower Too Hot on Coldest Setting

Have you ever turned on your shower to find it’s too hot, even on the coldest setting? If so, you’re not alone.

The problem of having a shower that’s too hot on the coldest setting is one of the most common plumbing issues reported by homeowners. But with a little know-how and some basic tools, you can diagnose and fix this problem yourself in no time.

Shower Too Hot on Coldest Setting: Here are some things to check

Check for leaky faucets

If you have a leaky faucet, this could be causing your shower head to run hot. Check for any dripping or leaking around your faucets and repair them as necessary before proceeding with further diagnosis.

Check for worn parts in your water heater

If your water heater is old enough to be failing, it could be causing problems with temperature regulation. You should replace your heater if it has been operating less than 10 years or if it is older than 15 years (the average lifespan of a water heater).

Why Is The Shower Too Hot On The Coldest Setting?

There are several reasons why you might have a problem with your shower being too hot on the coldest setting:

The Cartridge Has Broken or Worn Out Over Time

This can be easily fixed by removing and replacing the cartridge with a new one. The best way to do this is by calling a licensed plumber who can perform this task for you quickly and correctly.

The System Has Been Poorly Maintained

If you’re not sure how long your shower has been installed, or if it was installed by someone who didn’t do a good job, there could be leaks in the pipes or valves that are allowing hot water to get into the cold line. This is especially common around shower heads because they’re more likely to leak than other fixtures.

There Might Be a Problem With The Flow Rate

If the problem started after a recent change to your plumbing or heating system, then it’s possible that some of the pipes may have been damaged during the installation process. If this is the case, then you should contact an experienced plumber for advice and help with repairs.

You Have an Older-Style System

If your shower is more than 10 years old, it’s likely that it uses a flow restrictor. This was a common way to reduce water usage in older systems. The problem with this method is that you lose pressure when the water temperature drops. This means that if your hot water is too hot, it will be even hotter in the coldest setting. It also means that if there’s something wrong with your system, it could affect both hot and cold settings.

If you have an older home, we recommend having a plumber come out and check things over to make sure everything is working properly.

There’s a Problem With The Thermostat or Timer

A properly functioning thermostat should not allow your water to get hotter than 110 degrees F (43 degrees C), no matter what setting it’s set on. If it does, this could indicate that there is something wrong with either the thermostat itself or with the timer mechanism (if there is one).

If you’ve recently replaced the set of parts that controls the temperature, or if you’ve had them serviced, make sure that it’s working properly. If not, call a plumber or heating contractor for help.

How To Fix A Shower That’s Too Hot On The Coldest Setting

The coldest setting on your shower head is likely not working properly, so you might be taking a scalding hot shower when you think it’s cold. If this is the case, there are several things you can do to fix it. Here are some ways to get your hot water temperature back under control:

Turn Off The Water Supply

Before doing anything else, turn off the water supply to your shower and allow it to drain completely so that it doesn’t spill over onto your floor when you remove the handle from its place in the wall. Then remove the handle from its place in the wall by unscrewing it with a screwdriver or wrench if necessary. This will allow you access to what controls the temperature setting of your shower head and should make any repairs easier than they would be otherwise.

Check Your Temperature Control

Once you have removed the handle from its place in the wall, check inside for any signs of corrosion or rust that might have developed over time from exposure to water flowing through the system.

If you have a gas water heater, make sure the pilot light is lit and that the gas valve is open.

If you have an electric water heater, ensure there’s power going to the unit. If you don’t hear any humming or buzzing when you turn on a faucet or switch on the lights, then there might be a problem with your breaker panel or circuit breaker box.

If everything seems to be working fine, it could be time for a new cartridge. This piece sits at the bottom of the tank and controls how much hot water comes out of each faucet in your home. It also keeps track of how much hot water is stored in your tank so that it can regulate temperature properly. When they get old — usually after about 10 years — they start leaking heat into your tank and stop working correctly.

Replace the cartridge with a new one of the same size and type. Make sure that there are no leaks before turning on the water again.


If you don’t trust your shower to heat up or cool down at the right time, we hope this article has helped you, and you don’t find any more hot water scalding your hands any time soon.

We recommend you call a professional. Although the problem with your shower could be something smaller than what we have described, it is always better to be safe than sorry. A professional can help identify exactly what the issue is in a matter of minutes, especially if they are familiar with the system and they will only charge you a small fee.