Dishwasher Not Heating Troubleshooting (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

A dishwasher not heating is often caused by a faulty heating element or thermostat. Turn off power, check the element for damage, and test the thermostat with a multimeter. Replace as needed.

Confirm the symptom

Dishes remain wet or cold after cycle
No visible steam during cycle
Dishwasher runs but water stays cold
Recent repair or part replacement failed to fix issue

Tools and prep

Screwdrivers (flathead and Phillips)
Multimeter (set to ohms)
Owner’s manual for model-specific guidance
Work gloves and safety glasses
Turn off power at circuit breaker
Turn off water supply to dishwasher

Step-by-step troubleshooting

Check Power Supply
Do: Verify the dishwasher is receiving power and the circuit breaker hasn’t tripped.
Observe: Power indicator lights or motor hum when door is closed.
Means: Power is active; issue is not with the electrical supply.
Next: Test heating element
Test Heating Element
Do: Unplug dishwasher. Remove lower panel to access the heating element. Use a multimeter to check for continuity.
Observe: Multimeter shows no continuity or infinite resistance.
Means: Heating element is faulty and needs replacement.
Next: Replace heating element
Test Thermostat
Do: Locate the thermostat (often near the heating element). Use a multimeter to test for continuity.
Observe: No continuity or resistance outside manufacturer specs.
Means: Thermostat is defective and must be replaced.
Next: Replace thermostat
Inspect Water Inlet Valve
Do: Check for clogs or debris in the water inlet valve that might restrict hot water flow.
Observe: Debris or blockage in valve prevents hot water from entering.
Means: Clean or replace the water inlet valve.
Next: Run a test cycle
Check High-Limit Thermostat
Do: Test the high-limit thermostat with a multimeter. This safety device cuts power if the dishwasher overheats.
Observe: No continuity or resistance outside normal range.
Means: High-limit thermostat is tripped or failed; replace it.
Next: Replace high-limit thermostat
Run a Diagnostic Cycle
Do: Refer to the owner’s manual for diagnostic mode instructions. This can identify error codes or internal faults.
Observe: Error codes or unusual behavior during the cycle.
Means: Internal fault requires part replacement or professional repair.
Next: Consult a professional

Common causes

Cause	Likelihood	Difficulty	Part often needed
Faulty Heating Element The heating element is damaged or burned out and cannot heat water.	Common	Medium	Yes
Defective Thermostat The thermostat fails to regulate temperature, preventing the heating element from activating.	Common	Medium	Yes
Tripped High-Limit Thermostat A safety device cuts power after overheating, often due to a stuck heating element.	Sometimes	Medium	Yes
Low Water Supply Insufficient water pressure or a closed shut-off valve prevents water from reaching the heating element.	Rare	Easy	No
Clogged Water Inlet Valve Debris blocks the valve, restricting hot water flow to the dishwasher.	Sometimes	Easy–Medium	Yes
Failed Control Board The control board fails to send power to the heating element.	Rare	Hard	Yes
Incorrect Water Temperature Water heater is set too low, so incoming water isn’t hot enough for the dishwasher.	Rare	Easy	No
Loose or Corroded Wiring Poor electrical connections prevent power from reaching the heating element.	Sometimes	Medium	No

Parts matching

Common parts needed for a dishwasher not heating:

Heating Element (replace if no continuity)
Thermostat (replace if defective)
High-Limit Thermostat (replace if tripped or failed)
Water Inlet Valve (replace if clogged or faulty)
Control Board (replace if all other parts are functional but heating fails)

Purchase OEM parts or high-quality replacements to ensure compatibility and longevity.

When to call a professional

You detect a burning smell or smoke during testing
You hear unusual noises like grinding or clicking after repairs
You tested all parts and none show faults but heating still fails
You’re unsure about electrical testing or part installation
The dishwasher is under warranty and DIY repairs may void it

FAQ

Can I use my dishwasher without the heating element?

Yes, but dishes may not dry properly and bacteria could remain. It’s not recommended for long-term use.

How long does a dishwasher heating element last?

Typically 5–10 years, depending on usage and water quality.

Why does my dishwasher heat sometimes but not always?

Intermittent heating may indicate a loose connection, failing thermostat, or a partially damaged heating element.

Can hard water cause a dishwasher to stop heating?

Hard water can clog valves or the heating element, but it doesn’t directly prevent heating. Regular descaling helps prevent this.

Is it cheaper to repair or replace a dishwasher?

For most models, replacing parts like the heating element or thermostat is cost-effective. Replacement is better if multiple components are failing or the unit is old.