How to Fix Shower Temperature
Inconsistent shower temperature or scalding hot water indicates a faulty mixing valve. Learn to diagnose and fix temperature control issues for safe, comfortable showers.
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0 of 6 steps completedStep-by-Step Instructions
1 Step 1: Test Hot Water Heater Setting
Step 1: Test Hot Water Heater Setting
Check water heater thermostat. It should be set to 120°F for safety. Higher temperatures increase scalding risk.
Shower Valve Cartridge
Replacement temperature control cartridge
2 Step 2: Check for Crossover
Step 2: Check for Crossover
Turn off water heater. If hot water continues from cold taps after 30 minutes, you have a crossover connection somewhere.
Cartridge Puller Tool
Special tool for removing stuck shower cartridges
3 Step 3: Inspect Shower Cartridge
Step 3: Inspect Shower Cartridge
Remove shower handle and trim. Extract the cartridge and check for mineral buildup, damage, or worn seals.
Plumbers Grease
Silicone-based grease for shower valve parts
4 Step 4: Clean or Replace Cartridge
Step 4: Clean or Replace Cartridge
Soak cartridge in vinegar to remove mineral deposits. If damaged or worn, replace with exact manufacturer replacement part.
Shower Trim Kit
Replacement handle and trim for shower valve
5 Step 5: Adjust Temperature Limit Stop
Step 5: Adjust Temperature Limit Stop
Most valves have a temperature limit stop. Adjust this screw to set maximum hot water temperature for safety.
Thermostatic Mixing Valve
Anti-scald mixing valve for consistent temperature
6 Step 6: Call Plumber for Pressure Balance Issues
Step 6: Call Plumber for Pressure Balance Issues
If temperature fluctuates when other fixtures are used, you need pressure-balancing valve installation by a professional.
Water Temperature Gauge
Digital thermometer for testing shower water temp