Maytag F20

Maytag error code F20 indicates: Maytag Maxima MEDB Steam & Extra Power Tumble Dryer: Electronic moisture sensor bars shorted or bridged F20; auto-sensing cycle terminates prematurely with clothes still damp..

The primary root cause for Maytag code F20 is: On Maytag dryers (Maytag Commercial Technology heavy-duty direct drive chassis and industrial-grade relays): Metallic object (hairpin, coin, foil) wedged across the two stainless sensor strips near the lint screen, or dryer sheet wax residue buildup..

To resolve error code F20: Clean stainless sensor bars with rubbing alcohol and a Scotch-Brite pad to remove invisible softener film. Check sensor continuity with ohmmeter: open circuit with drum empty. Rotate cycle dial 1 full turn counter-clockwise, then 3 clicks right, 1 click left, 1 click right. All status LEDs illuminate; press Start to begin diagnostics.

Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Maytag code F20 persists, the physical component causing On Maytag dryers (Maytag Commercial Technology heavy-duty direct drive chassis and industrial-grade relays): Metallic object (hairpin, coin, foil) wedged across the two stainless sensor strips near the lint screen, or dryer sheet wax residue buildup. must be inspected or replaced.

Set a digital multimeter to ohms (Ω). Disconnect power and test 3-Phase Motor Windings / Tacho Generator / Carbon Brushes across Across phase pins U-V, V-W, U-W on motor harness; across tacho pins. Expected nominal reading is 3Ω–6Ω (BLDC phase U-V-W) / 60Ω–180Ω (Tacho coil) / 1.5Ω–3.5Ω (Universal stator). Tolerance: BLDC phase winding values must be strictly balanced within ±0.3Ω. Hand rotation generates 1V–4V AC on tacho..

Standard electrical safety protocol: 1. Disconnect 230V mains power before opening panels. 2. Verify zero voltage at test points. 3. Allow hot water or heating elements to cool below 30°C before handling.