🔥Oven / Range

MECH-KNOB

GE · JS645SLSS 5.3 cu ft Slide-In Electric Range

GE JS645SLSS 5.3 cu ft Slide-In Electric Range MECH-KNOB Error Fix: Control Knob Stiff or Will Not Turn

A surface burner or oven control knob feels stuck, is very stiff to turn, or will not turn at all — grease, food residue, and cleaning products can seize the valve stem underneath the knob; DO NOT force the knob as the valve shaft inside can snap off, requiring a much more expensive repair; remove the knob and try applying a small amount of penetrating oil to the valve stem; if the stem is seized, the gas valve assembly may need professional replacement

Medium severity2 fixes available

Quick Answer

Error MECH-KNOB on the GE JS645SLSS 5.3 cu ft Slide-In Electric Range means: Control Knob Stiff or Will Not Turn. The top-ranked community fix is “Replace Gas Valve Assembly” (hard difficulty, ~60 min, DIY cost: $60-$90). 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.

When to Call a Professional

While many oven 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: $250-$400.

Other GE Models with Error MECH-KNOB

JB645RKSS 30 in 5.3 cu ft Electric Range with Convection Oven and Self-Clean

oven · 2 fixes

JB655SKSS 30 in 5.3 cu ft Slide-In Electric Convection Oven Stainless Steel

oven · 2 fixes

JB655YKFS 5.3 cu ft Electric Range with Self-Clean

oven · 2 fixes

JB735SPSS 5.3 cu ft Freestanding Electric Convection

oven · 2 fixes

JB750SJSS Electric Convection Range

oven · 2 fixes

JGB735SPSS 5.0 cu ft Freestanding Gas Convection

oven · 2 fixes

JGBS10DEMWW 5.0 cu ft Free-Standing Gas Range

oven · 2 fixes

JGBS66REKSS 5.0 cu ft Freestanding Gas with Griddle

oven · 2 fixes

JGS760SPSS 5.6 cu ft Slide-In Gas Convection

oven · 2 fixes

Other GE JS645SLSS 5.3 cu ft Slide-In Electric Range Error Codes

Stuck Touch Pad Key

2 fixes

Electronic Oven Control (ERC) Failure

2 fixes

Oven Over-Temperature Condition

2 fixes

Open Oven Temperature Sensor (RTD)

2 fixes

Shorted Oven Temperature Sensor

2 fixes

ERC Relay Drive Circuit Failure

2 fixes

Stuck Function Key (Bake/Broil/Clean)

2 fixes

Shorted Meat Probe Circuit

2 fixes

People Also Ask About GE JS645SLSS 5.3 cu ft Slide-In Electric Range Error MECH-KNOB

What does error code MECH-KNOB mean on a GE JS645SLSS 5.3 cu ft Slide-In Electric Range?

Error code MECH-KNOB on the GE JS645SLSS 5.3 cu ft Slide-In Electric Range means: Control Knob Stiff or Will Not Turn. A surface burner or oven control knob feels stuck, is very stiff to turn, or will not turn at all — grease, food residue, and cleaning products can seize the valve stem underneath the knob; DO NOT force the knob as the valve shaft inside can snap off, requiring a much more expensive repair; remove the knob and try applying a small amount of penetrating oil to the valve stem; if the stem is seized, the gas valve assembly may need professional replacement

How do I fix error code MECH-KNOB on my GE JS645SLSS 5.3 cu ft Slide-In Electric Range?

The most successful fix is "Replace Gas Valve Assembly" (hard difficulty, ~60 minutes). Estimated DIY cost: $60-$90. HomeMD has 2 community-ranked fixes for this error.

Is error code MECH-KNOB on a GE JS645SLSS 5.3 cu ft Slide-In Electric Range serious?

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Can I fix GE JS645SLSS 5.3 cu ft Slide-In Electric Range error MECH-KNOB myself?

Yes — the top-ranked community fix ("Replace Gas Valve Assembly") is rated hard difficulty and takes about 60 minutes. Tools needed: Phillips screwdriver, Adjustable wrench, Multimeter.

How much does it cost to repair GE JS645SLSS 5.3 cu ft Slide-In Electric Range error MECH-KNOB?

DIY cost: $60-$90. Professional repair typically costs $250-$400. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the GE JS645SLSS 5.3 cu ft Slide-In Electric Range have?

The GE JS645SLSS 5.3 cu ft Slide-In Electric Range has 8 other known error codes, including: F0 (Stuck Touch Pad Key), F1 (Electronic Oven Control (ERC) Failure), F2 (Oven Over-Temperature Condition), F3 (Open Oven Temperature Sensor (RTD)), F4 (Shorted Oven Temperature Sensor), and 3 more.

Which other GE models have the MECH-KNOB error?

Error code MECH-KNOB also appears on 9 other GE models: JB645RKSS 30 in 5.3 cu ft Electric Range with Convection Oven and Self-Clean, JB655SKSS 30 in 5.3 cu ft Slide-In Electric Convection Oven Stainless Steel, JB655YKFS 5.3 cu ft Electric Range with Self-Clean, JB735SPSS 5.3 cu ft Freestanding Electric Convection, JB750SJSS Electric Convection Range, JGB735SPSS 5.0 cu ft Freestanding Gas Convection, and 3 more. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the GE JS645SLSS 5.3 cu ft Slide-In Electric Range have?

The GE JS645SLSS 5.3 cu ft Slide-In Electric Range has 8 other known error codes:

F0 — Stuck Touch Pad Key (2 fixes)
F1 — Electronic Oven Control (ERC) Failure (2 fixes)
F2 — Oven Over-Temperature Condition (2 fixes)
F3 — Open Oven Temperature Sensor (RTD) (2 fixes)
F4 — Shorted Oven Temperature Sensor (2 fixes)
F5 — ERC Relay Drive Circuit Failure (2 fixes)
F7 — Stuck Function Key (Bake/Broil/Clean) (2 fixes)
F8 — Shorted Meat Probe Circuit (2 fixes)

Which other GE models have the MECH-KNOB error?

Error code MECH-KNOB also appears on 9 other GE models:

JB645RKSS 30 in 5.3 cu ft Electric Range with Convection Oven and Self-Clean (oven) · 2 fixes
JB655SKSS 30 in 5.3 cu ft Slide-In Electric Convection Oven Stainless Steel (oven) · 2 fixes
JB655YKFS 5.3 cu ft Electric Range with Self-Clean (oven) · 2 fixes
JB735SPSS 5.3 cu ft Freestanding Electric Convection (oven) · 2 fixes
JB750SJSS Electric Convection Range (oven) · 2 fixes
JGB735SPSS 5.0 cu ft Freestanding Gas Convection (oven) · 2 fixes
JGBS10DEMWW 5.0 cu ft Free-Standing Gas Range (oven) · 2 fixes
JGBS66REKSS 5.0 cu ft Freestanding Gas with Griddle (oven) · 2 fixes
JGS760SPSS 5.6 cu ft Slide-In Gas Convection (oven) · 2 fixes

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