How to 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
Mike Johnson: "Pro tip: Make sure to double-check this before moving to the next step..."
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.
2 Step 2: Check for Crossover
Mike Johnson: "Pro tip: Make sure to double-check this before moving to the next step..."
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.
3 Step 3: Inspect Shower Cartridge
Mike Johnson: "Pro tip: Make sure to double-check this before moving to the next step..."
Step 3: Inspect Shower Cartridge
Remove shower handle and trim. Extract the cartridge and check for mineral buildup, damage, or worn seals.
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.
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.
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.