Warning: Disconnect power before servicing.
ErrBase

Whirlpool Dishwasher Not Heating Water: Diagnosis and Repair Guide

Quick Answer

Whirlpool dishwasher not heating water: test the heating element first with a multimeter. It should read 15-30 ohms; OL means it is burned out. Dishes coming out wet even on Heated Dry cycles, or the sanitize function failing, both point to a heating element or thermistor failure. On WDT series models, hard water scale buildup on the element is the leading cause.

A Whirlpool dishwasher that is not heating water will typically trigger an F7 E1 code, or on older models a 4-3 blink pattern. Dishes emerge wet even on heated dry cycles, and the sanitize function fails. Test the heating element first (15-30 ohms is good; OL means burned out). On WDT series models with hard water, scale encrustation on the element is the leading cause of element failure. After the element, check the thermistor and then the control board heater relay.

WhirlpoolDishwasherSeverity: moderateDifficulty: intermediate85% DIY Success
Time to Fix
25–70 min
Difficulty
intermediate
Parts Cost
$12 – $280
Tools Needed
Multimeter, Torx T20 screwdriver

What Does the NOT-HEATING Code Mean?

Water stays cold, dishes come out wet. Test the heating element resistance (15-30 ohms) before replacing anything. Scale on the element surface is the most common cause of heater failure on WDT series models.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Heating element burned out (most common cause)40%
Thermistor reporting incorrect temperature24%
Thermal fuse blown in heating circuit22%
Control board heater relay failed14%

Symptoms You May Notice

  • Dishes and interior still cold after cycle completes
  • Dishes wet at end of cycle - no evaporation
  • F7 E1 error code displayed
  • Sanitize indicator light not lighting up or sanitize function absent

Can you reset a Whirlpool dishwasher to clear the NOT-HEATING code?

Hold Cancel/Drain for 3 seconds to clear F7 E1 after component replacement. Run a full heated dry cycle to confirm heating has been restored.

Tools Required for Diagnosis

MultimeterTorx T20 screwdriverFlathead screwdriver

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

1

After disconnecting power

After disconnecting power, access the heater element around the tub perimeter (remove lower spray arm first). Disconnect both terminal wires and measure resistance across the terminals.

2

Disconnect the thermistor at the sump wall

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name
Heating Element AssemblyW10518394 · $35–$65
NTC ThermistorW10057581 · $12–$22
Main Control BoardW10695459 · $150–$280

Repair vs. Replace Calculator

Appliance Age (Years)7 Yrs
Labor Approach
Our Verdict
BORDERLINE
Estimated Cost: $146 (Parts) vs $700 (New Machine)

Frequently Asked Questions

Can my Whirlpool dishwasher wash dishes if the heater is broken?
Yes - dishes will be washed with cold or warm supply water. However, they will not be sanitized, the dried result will be poor (dishes come out wet), and heated dry will not function. Bacteria requiring high-temperature kill may not be eliminated.
How do I prevent the heating element from burning out?
Run a monthly descaling cycle with citric acid or a commercial dishwasher descaler. This removes the mineral scale that acts as an insulator on the element surface, which causes the element to run at higher-than-rated temperatures until it fails.

Related Whirlpool Dishwasher Error Codes

Code: F7 E1Whirlpool Dishwasher F7 E1 Error Code: Heater Circuit FaultCode: E2 F2Whirlpool Dishwasher E2 F2 Error Code: Water Temperature LowCode: WONT-DRYWhirlpool Dishwasher Wont Dry Dishes: Heater and Rinse Aid Fixes

Same Fix Works on These Brands

Whirlpool shares the same hardware platform with these brands. The diagnosis and repair steps are identical.

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Models Known to Experience NOT-HEATING Errors

This repair applies to most Whirlpool dishwashers with this error code. Common model numbers include:

WDT780SAEM, WDF550SAHZ, WDT730PAHZ, WDT750SAHZ, WDT970SAHZ, WDF518SAHM, WDT720PADE

Last verified for technical accuracy on March 14, 2026