Shower Not Giving Hot Water

On this page

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 mixing valve, and test the water heater. If the issue persists, replace faulty parts or call a plumber.

Confirm the symptom

Only cold water comes out of the shower
Hot water works in other fixtures but not the shower
No hot water after a power outage or water shutoff

Tools and prep

Adjustable wrench
Screwdriver (flathead and Phillips)
Plumber's tape
Bucket or towel
Flashlight
Turn off the water supply to the shower
Turn off power to the water heater if electrical

Step-by-step troubleshooting

Check Water Supply Valves
Do: Locate and open the shut-off valves under the sink or near the shower.
Observe: Water flows freely from the valves.
Means: Valves were closed, restricting water flow.
Next: If valves are open, proceed to the next step.
Inspect the Mixing Valve
Do: Turn on the shower and check the temperature control.
Observe: No hot water despite adjusting the handle.
Means: The mixing valve may be faulty or clogged.
Next: Disassemble the valve to check for debris or damage.
Test the Water Heater
Do: Check the water heater's thermostat and ensure it's set to a proper temperature.
Observe: The water heater is not producing hot water.
Means: The water heater may be malfunctioning.
Next: Test the heating elements or pilot light, if applicable.
Check for Blockages
Do: Remove the showerhead and run water to check for clogs.
Observe: Debris or mineral buildup is present.
Means: A clogged showerhead is restricting hot water flow.
Next: Clean or replace the showerhead.
Examine the Pressure Balance
Do: Inspect the pressure-balancing valve for leaks or damage.
Observe: Water pressure fluctuates or leaks occur.
Means: A faulty pressure-balancing valve is affecting hot water delivery.
Next: Replace the pressure-balancing valve if damaged.
Check the Thermostatic Valve
Do: If your shower has a thermostatic valve, test its function.
Observe: The valve does not maintain a consistent temperature.
Means: The thermostatic valve is faulty.
Next: Replace the thermostatic valve.
Inspect the Pipes
Do: Look for leaks or damage in the hot water supply lines.
Observe: Leaks or damaged pipes are visible.
Means: Pipe damage is preventing hot water from reaching the shower.
Next: Repair or replace damaged pipes.

Common causes

Cause	Likelihood	Difficulty	Part often needed
Closed Water Supply Valves Valves restrict water flow to the shower.	Common	Easy	None
Faulty Mixing Valve The valve fails to blend hot and cold water properly.	Common	Medium	Mixing Valve
Clogged Showerhead Mineral buildup blocks water flow.	Common	Easy	Showerhead
Malfunctioning Water Heater The heater isn't producing hot water.	Sometimes	Hard	Water Heater
Faulty Pressure-Balancing Valve The valve can't maintain pressure balance, affecting temperature.	Sometimes	Medium	Pressure-Balancing Valve
Thermostatic Valve Failure The valve can't regulate temperature effectively.	Rare	Medium	Thermostatic Valve
Damaged Hot Water Pipes Leaks or breaks prevent hot water from reaching the shower.	Rare	Hard	Pipe Repair Kit

Parts matching

Common parts needed for a shower with no hot water include:

Mixing Valve
Showerhead
Pressure-Balancing Valve
Thermostatic Valve
Pipe Repair Kit

Purchase parts compatible with your shower model to ensure a proper fit and function.

When to call a professional

You cannot locate or access the water supply valves
The water heater requires complex repairs
You suspect gas line issues or electrical problems
Multiple fixtures are affected by the lack of hot water
You're unsure about handling plumbing or electrical components

FAQ

Why is my shower only giving cold water?

This could be due to a closed water supply valve, a faulty mixing valve, or a malfunctioning water heater.

How do I know if my mixing valve is bad?

If adjusting the temperature doesn't change the water temperature, the mixing valve may be faulty.

Can a clogged showerhead cause no hot water?

Yes, mineral buildup can block water flow, especially if the issue is isolated to one shower.

Is it normal for hot water to stop after a power outage?

If the water heater lost power, it may need to be reset. Check the thermostat and pilot light if applicable.

How often should I replace a pressure-balancing valve?

These valves typically last 10–15 years. Replace if you notice temperature fluctuations or leaks.