🔥Oven / Range

F18

Thermador · PRL366WG 36 in Pro Grand Range with 5 Burners, 22,000 BTU Power Burner, and Convection Oven

Thermador PRL366WG 36 in Pro Grand Range with 5 Burners, 22,000 BTU Power Burner, and Convection Oven F18 Error Fix: Oven Cooling Fan Fault

The cooling fan that protects oven electronics is not operating correctly, causing overheating risk. The error is triggered when the fan fails to start or runs intermittently. Oven may shut down to prevent damage.

High severity2 fixes available

Quick Answer

Error F18 on the Thermador PRL366WG 36 in Pro Grand Range with 5 Burners, 22,000 BTU Power Burner, and Convection Oven means: Oven Cooling Fan Fault. The top-ranked community fix is “Replace Cooling Fan Motor” (hard difficulty, ~60 min, DIY cost: $80-$120). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · oven

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.

Root Cause Analysis

Motor FailurePrimary

Mechanical Wear

When to Call a Professional

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

This is a high severity error — continued use may cause damage or a safety hazard
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: $250-$350.

Other Thermador Models with Error F18

MED301JS 30 in Masterpiece Series Single Wall Oven with 4.3 cu ft Capacity and Steam Bake

oven · 2 fixes

PODS301W 30 in Wall Oven with 4.3 cu ft Capacity and Convection Cooking

oven · 2 fixes

PRD486WDGU Pro Grand 48"

oven · 2 fixes

T36BT925NS 36 in 20.9 cu ft Freedom® Collection French Door Refrigerator with WiFi Connectivity and ThermaFresh System

refrigerator · 2 fixes

Other Thermador PRL366WG 36 in Pro Grand Range with 5 Burners, 22,000 BTU Power Burner, and Convection Oven Error Codes

Oven Temperature Sensor Failure

Oven Relay Stuck

Oven Door Sensor Error

2 fixes

F12

Oven Temperature Sensor Short Circuit

2 fixes

F13

Oven Relay Open Circuit

2 fixes

F14

Oven Door Latch Motor Failure

2 fixes

F15

Oven Sensor Thermistor Open Circuit

2 fixes

F16

Oven Door Gasket Damaged

2 fixes

People Also Ask About Thermador PRL366WG 36 in Pro Grand Range with 5 Burners, 22,000 BTU Power Burner, and Convection Oven Error F18

What does error code F18 mean on a Thermador PRL366WG 36 in Pro Grand Range with 5 Burners, 22,000 BTU Power Burner, and Convection Oven?

Error code F18 on the Thermador PRL366WG 36 in Pro Grand Range with 5 Burners, 22,000 BTU Power Burner, and Convection Oven means: Oven Cooling Fan Fault. The cooling fan that protects oven electronics is not operating correctly, causing overheating risk. The error is triggered when the fan fails to start or runs intermittently. Oven may shut down to prevent damage.

How do I fix error code F18 on my Thermador PRL366WG 36 in Pro Grand Range with 5 Burners, 22,000 BTU Power Burner, and Convection Oven?

The most successful fix is "Replace Cooling Fan Motor" (hard difficulty, ~60 minutes). Estimated DIY cost: $80-$120. HomeMD has 2 community-ranked fixes for this error.

Is error code F18 on a Thermador PRL366WG 36 in Pro Grand Range with 5 Burners, 22,000 BTU Power Burner, and Convection Oven serious?

This error is rated high severity. You should address it promptly — continued use could cause damage or safety concerns.

Can I fix Thermador PRL366WG 36 in Pro Grand Range with 5 Burners, 22,000 BTU Power Burner, and Convection Oven error F18 myself?

Yes — the top-ranked community fix ("Replace Cooling Fan Motor") is rated hard difficulty and takes about 60 minutes. Tools needed: Phillips screwdriver, Nut driver.

How much does it cost to repair Thermador PRL366WG 36 in Pro Grand Range with 5 Burners, 22,000 BTU Power Burner, and Convection Oven error F18?

DIY cost: $80-$120. Professional repair typically costs $250-$350. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Thermador PRL366WG 36 in Pro Grand Range with 5 Burners, 22,000 BTU Power Burner, and Convection Oven have?

The Thermador PRL366WG 36 in Pro Grand Range with 5 Burners, 22,000 BTU Power Burner, and Convection Oven has 8 other known error codes, including: F1 (Oven Temperature Sensor Failure), F10 (Oven Relay Stuck), F11 (Oven Door Sensor Error), F12 (Oven Temperature Sensor Short Circuit), F13 (Oven Relay Open Circuit), and 3 more.

Which other Thermador models have the F18 error?

Error code F18 also appears on 4 other Thermador models: MED301JS 30 in Masterpiece Series Single Wall Oven with 4.3 cu ft Capacity and Steam Bake, PODS301W 30 in Wall Oven with 4.3 cu ft Capacity and Convection Cooking, PRD486WDGU Pro Grand 48", T36BT925NS 36 in 20.9 cu ft Freedom® Collection French Door Refrigerator with WiFi Connectivity and ThermaFresh System. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the Thermador PRL366WG 36 in Pro Grand Range with 5 Burners, 22,000 BTU Power Burner, and Convection Oven have?

The Thermador PRL366WG 36 in Pro Grand Range with 5 Burners, 22,000 BTU Power Burner, and Convection Oven has 8 other known error codes:

F1 — Oven Temperature Sensor Failure (2 fixes)
F10 — Oven Relay Stuck (2 fixes)
F11 — Oven Door Sensor Error (2 fixes)
F12 — Oven Temperature Sensor Short Circuit (2 fixes)
F13 — Oven Relay Open Circuit (2 fixes)
F14 — Oven Door Latch Motor Failure (2 fixes)
F15 — Oven Sensor Thermistor Open Circuit (2 fixes)
F16 — Oven Door Gasket Damaged (2 fixes)

Which other Thermador models have the F18 error?

Error code F18 also appears on 4 other Thermador models:

MED301JS 30 in Masterpiece Series Single Wall Oven with 4.3 cu ft Capacity and Steam Bake (oven) · 2 fixes
PODS301W 30 in Wall Oven with 4.3 cu ft Capacity and Convection Cooking (oven) · 2 fixes
PRD486WDGU Pro Grand 48" (oven) · 2 fixes
T36BT925NS 36 in 20.9 cu ft Freedom® Collection French Door Refrigerator with WiFi Connectivity and ThermaFresh System (refrigerator) · 2 fixes

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