Dishwasher Thermometer Troubleshooting Guide (Troubleshooting Guide)

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

Use a dishwasher thermometer to check if your dishwasher heats water properly. If it doesn’t reach 140°F (60°C), the heating element or thermostat may need replacement.

Confirm the symptom

Dishes remain dirty or greasy after a cycle
Water isn’t hot enough during the wash/rinse cycle
Dishwasher takes longer to dry dishes
You’ve tested the water temperature and it’s below 140°F (60°C)

Tools and prep

Screwdriver (flathead or Phillips, depending on model)
Dishwasher thermometer or a candy thermometer
Safety gloves
Turn off the dishwasher power at the circuit breaker
Turn off the water supply to the dishwasher

Step-by-step troubleshooting

Check Water Temperature
Do: Place the thermometer in the dishwasher during a normal cycle and monitor the temperature.
Observe: Temperature should reach 140°F (60°C) during the wash cycle.
Means: If it doesn’t reach this temperature, the heating element or thermostat is likely faulty.
Next: Test the heating element and thermostat
Test the Heating Element
Do: Use a multimeter to check for continuity on the heating element terminals.
Observe: No continuity means the heating element is faulty.
Means: Replace the heating element.
Next: Replace the heating element
Test the Thermostat
Do: Use a multimeter to test the thermostat for continuity.
Observe: No continuity means the thermostat is faulty.
Means: Replace the thermostat.
Next: Replace the thermostat
Replace the Heating Element
Do: Remove the lower rack and access panel. Disconnect the wires from the heating element and remove it.
Observe: Heating element is disconnected and removed.
Means: Install the new heating element and reconnect the wires.
Next: Test the dishwasher
Replace the Thermostat
Do: Remove the control panel cover and locate the thermostat. Disconnect the wires and remove the thermostat.
Observe: Thermostat is disconnected and removed.
Means: Install the new thermostat and reconnect the wires.
Next: Test the dishwasher
Test the Dishwasher
Do: Turn the power and water supply back on. Run a normal cycle and check the temperature again.
Observe: Temperature should now reach 140°F (60°C).
Means: Dishwasher is working properly.
Next: Monitor performance over the next few cycles

Common causes

Cause	Likelihood	Difficulty	Part often needed
Faulty Heating Element The heating element may wear out over time and stop working.	Common	Medium	Yes
Failed Thermostat The thermostat can fail and prevent the heating element from activating.	Sometimes	Medium	Yes
Incorrect Water Temperature If the incoming water is too cold, the dishwasher may not heat properly.	Rare	Easy	No
Blocked Drain Hose A clogged drain hose can cause poor water circulation and temperature issues.	Rare	Easy	No
Faulty High-Limit Thermostat The high-limit thermostat can shut off the heating element if it detects overheating.	Rare	Hard	Yes
Control Board Failure A malfunctioning control board may not send power to the heating element.	Rare	Hard	Yes

Parts matching

Common parts needed for a dishwasher thermometer issue include:

Dishwasher Heating Element
Dishwasher Thermostat
High-Limit Thermostat
Control Board (if applicable)

Check your dishwasher model number to ensure you get the correct replacement parts.

When to call a professional

You’re unsure about electrical testing or repairs
The dishwasher still doesn’t heat properly after replacing parts
You notice water leaks or electrical issues
The control board is suspected to be faulty
The warranty is still valid and covers repair services

FAQ

How do I know if my dishwasher needs a new heating element?

If the water temperature doesn’t reach 140°F (60°C) during the wash cycle, the heating element may be faulty and need replacement.

Can I use a regular thermometer to check the dishwasher temperature?

Yes, a candy thermometer or a food thermometer can be used, but a dishwasher-specific thermometer is more accurate.

Why is my dishwasher not heating even after replacing the heating element?

The thermostat or control board may be faulty, preventing power from reaching the heating element.

Is it safe to use my dishwasher if it’s not heating properly?

It’s not recommended, as it can lead to poor cleaning performance and potential damage to dishes or the dishwasher.

How often should I check my dishwasher’s temperature?

Check the temperature every 6–12 months to ensure the dishwasher is heating properly.