Shower Not Getting Cold Water

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Quick answer
Confirm the symptom
Tools and prep
Step-by-step troubleshooting
Common causes table
Parts matching
When to call a pro
FAQ
Related guides

Quick answer

Turn off the water supply. Check the shower valve for debris or a faulty diverter. Clean or replace the cartridge if needed. Test the temperature balance.

Confirm the symptom

Shower only produces hot water
Cold water handle does not lower temperature
No water flow from cold side of mixing valve

Tools and prep

Adjustable wrench
Plumber's putty or tape
Replacement cartridge (if needed)
Bucket or towel to catch water
Turn off water supply before starting
Protect floor with towels to catch drips

Step-by-step troubleshooting

Shut Off Water Supply
Do: Turn off the main water supply to the bathroom or home.
Observe: Water stops flowing from the shower.
Means: Safe to proceed with repairs.
Next: Inspect the shower valve
Inspect the Shower Valve
Do: Remove the shower handle and trim to access the valve.
Observe: Look for visible debris, corrosion, or a damaged cartridge.
Means: The valve may be clogged or faulty.
Next: Clean or replace the cartridge
Clean or Replace the Cartridge
Do: Remove the old cartridge and clean it with vinegar or replace it with a new one.
Observe: Water flows cold after reassembly.
Means: The issue was a clogged or faulty cartridge.
Next: Test the shower temperature
Test the Shower Temperature
Do: Turn on the shower and adjust the handles to check for cold water.
Observe: Cold water flows properly and temperature is adjustable.
Means: Issue resolved.
Next: Finish
Check Mixing Valve
Do: Inspect the pressure-balancing or thermostatic mixing valve for issues.
Observe: Valve is stuck in hot position or has internal damage.
Means: Valve needs repair or replacement.
Next: Replace mixing valve if necessary
Inspect Water Supply Lines
Do: Check the cold water supply line for blockages or leaks.
Observe: Cold line is clogged or damaged.
Means: Clear the blockage or replace the line.
Next: Test the shower again

Common causes

Cause	Likelihood	Difficulty	Part often needed
Clogged cartridge Mineral deposits or debris block cold water flow.	Common	Easy–Medium	Shower cartridge
Faulty mixing valve Valve is stuck or not balancing hot and cold water.	Common	Medium	Mixing valve
Closed cold water shut-off valve The cold water supply to the shower is manually turned off.	Sometimes	Easy	None
Broken diverter valve Diverter is not allowing cold water to flow to the showerhead.	Sometimes	Medium	Diverter valve
Damaged water supply line Cold water line is cracked or blocked.	Rare	Hard	Supply line
Thermostatic valve failure Thermostatic valve is not regulating temperature correctly.	Rare	Hard	Thermostatic valve

Parts matching

Common parts needed for this repair include:

Shower cartridge (specific to your valve type)
Plumber's putty or Teflon tape
Replacement mixing valve (if needed)

Take the old cartridge to the hardware store to ensure a proper match.

When to call a professional

You cannot locate or access the shower valve
Water supply lines are damaged and hard to replace
Mixing valve requires complex replacement
You are unsure about the correct part to install
The issue persists after replacing parts

FAQ

Why is my shower only hot water?

This is often due to a clogged or faulty cartridge in the shower valve or a stuck mixing valve.

Can I fix this without replacing parts?

Cleaning the cartridge and checking shut-off valves may resolve the issue without replacement.

How do I know which cartridge to buy?

Take the old cartridge to the store for a direct match or check the manufacturer's website for specifications.

Is it normal for cold water to stop working suddenly?

Yes, if a valve becomes clogged or a part fails. It's usually fixable with basic tools.

Can a bad mixing valve affect other fixtures?

Typically not, but a faulty pressure-balancing valve can cause temperature fluctuations in the shower.