❄️Refrigerator

Whirlpool · Whirlpool WRF535SWHZ 25 cu. ft. French Door Refrigerator

Whirlpool Whirlpool WRF535SWHZ 25 cu. ft. French Door Refrigerator 1 Error Fix: Defrost Bimetal/Thermostat Failure

Diagnostic flash code: the defrost bimetal thermostat has failed. The thermostat monitors evaporator temperature during defrost — when the coils reach a set temperature, it signals the defrost heater to turn off. If the thermostat fails in the open position, the defrost heater never turns on, causing ice buildup on the evaporator coils. If it fails closed, the heater runs too long. Test the bimetal with a multimeter — at room temperature it should show continuity (closed). Replace if it shows open circuit at room temperature.

warning2 fixes available✨ Free fix available

Quick Answer

Error 1 on the Whirlpool Whirlpool WRF535SWHZ 25 cu. ft. French Door Refrigerator means: Defrost Bimetal/Thermostat Failure. The top-ranked community fix is “Test and Replace the Defrost Bimetal Thermostat” (medium difficulty, ~45 min, DIY cost: $15-$25). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · refrigerator

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

When to Call a Professional

While many refrigerator repairs can be done safely at home, consider hiring a qualified technician if:

The repair involves electrical wiring, gas lines, or refrigerant
You've tried the top-ranked fix and the error persists
You smell gas, see sparking, or notice water leaking
The repair requires specialized tools you don't have
Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $120-$180.

Other Whirlpool Models with Error 1

Whirlpool WRS331SDHM 21 cu. ft. Side-by-Side Refrigerator

refrigerator · 2 fixes

Whirlpool WRT318FZDW 18 cu. ft. Top Freezer Refrigerator

refrigerator · 2 fixes

Other Whirlpool Whirlpool WRF535SWHZ 25 cu. ft. French Door Refrigerator Error Codes

Defrost Heater Failure

2 fixes

Defrost Timer/Board Failure

2 fixes

Communication Fault

2 fixes

MECH-COMPRESSOR

Compressor Click-and-Buzz Failure

2 fixes

MECH-ICE-BUILDUP

Frost/Ice Buildup in Freezer

2 fixes

MECH-ICE-MAKER

Ice Maker Not Making Ice

2 fixes

MECH-NOISY

Refrigerator Making Loud Noise

2 fixes

MECH-NOT-COOL

Refrigerator Not Cooling

2 fixes

People Also Ask About Whirlpool Whirlpool WRF535SWHZ 25 cu. ft. French Door Refrigerator Error 1

What does error code 1 mean on a Whirlpool Whirlpool WRF535SWHZ 25 cu. ft. French Door Refrigerator?

Error code 1 on the Whirlpool Whirlpool WRF535SWHZ 25 cu. ft. French Door Refrigerator means: Defrost Bimetal/Thermostat Failure. Diagnostic flash code: the defrost bimetal thermostat has failed. The thermostat monitors evaporator temperature during defrost — when the coils reach a set temperature, it signals the defrost heater to turn off. If the thermostat fails in the open position, the defrost heater never turns on, causing ice buildup on the evaporator coils. If it fails closed, the heater runs too long. Test the bimetal with a multimeter — at room temperature it should show continuity (closed). Replace if it shows open circuit at room temperature.

How do I fix error code 1 on my Whirlpool Whirlpool WRF535SWHZ 25 cu. ft. French Door Refrigerator?

The most successful fix is "Test and Replace the Defrost Bimetal Thermostat" (medium difficulty, ~45 minutes). Estimated DIY cost: $15-$25. HomeMD has 2 community-ranked fixes for this error.

Is error code 1 on a Whirlpool Whirlpool WRF535SWHZ 25 cu. ft. French Door Refrigerator serious?

This error is rated warning severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Can I fix Whirlpool Whirlpool WRF535SWHZ 25 cu. ft. French Door Refrigerator error 1 myself?

Yes — the top-ranked community fix ("Test and Replace the Defrost Bimetal Thermostat") is rated medium difficulty and takes about 45 minutes. Tools needed: T20 Torx screwdriver, Multimeter, Needle-nose pliers.

How much does it cost to repair Whirlpool Whirlpool WRF535SWHZ 25 cu. ft. French Door Refrigerator error 1?

DIY cost: $15-$25. Professional repair typically costs $120-$180. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Whirlpool Whirlpool WRF535SWHZ 25 cu. ft. French Door Refrigerator have?

The Whirlpool Whirlpool WRF535SWHZ 25 cu. ft. French Door Refrigerator has 8 other known error codes, including: 2 (Defrost Heater Failure), 3 (Defrost Timer/Board Failure), CF (Communication Fault), MECH-COMPRESSOR (Compressor Click-and-Buzz Failure), MECH-ICE-BUILDUP (Frost/Ice Buildup in Freezer), and 3 more.

Which other Whirlpool models have the 1 error?

Error code 1 also appears on 2 other Whirlpool models: Whirlpool WRS331SDHM 21 cu. ft. Side-by-Side Refrigerator, Whirlpool WRT318FZDW 18 cu. ft. Top Freezer Refrigerator. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the Whirlpool Whirlpool WRF535SWHZ 25 cu. ft. French Door Refrigerator have?

The Whirlpool Whirlpool WRF535SWHZ 25 cu. ft. French Door Refrigerator has 8 other known error codes:

2 — Defrost Heater Failure (2 fixes)
3 — Defrost Timer/Board Failure (2 fixes)
CF — Communication Fault (2 fixes)
MECH-COMPRESSOR — Compressor Click-and-Buzz Failure (2 fixes)
MECH-ICE-BUILDUP — Frost/Ice Buildup in Freezer (2 fixes)
MECH-ICE-MAKER — Ice Maker Not Making Ice (2 fixes)
MECH-NOISY — Refrigerator Making Loud Noise (2 fixes)
MECH-NOT-COOL — Refrigerator Not Cooling (2 fixes)

Which other Whirlpool models have the 1 error?

Error code 1 also appears on 2 other Whirlpool models:

Whirlpool WRS331SDHM 21 cu. ft. Side-by-Side Refrigerator (refrigerator) · 2 fixes
Whirlpool WRT318FZDW 18 cu. ft. Top Freezer Refrigerator (refrigerator) · 2 fixes

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