Ariston F27

Ariston error code F27 indicates: Ariston Hotpoint-Ariston Aqualtis & Natis Washing Machine: Drum reversing motor relay contact stuck F27; motor can rotate in only one direction due to welded relay contacts..

The primary root cause for Ariston code F27 is: On Ariston washing appliances: High inductive arc discharge during drum reversal under heavy laundry load welding reversing relay contacts on PCB..

To resolve error code F27: De-energize machine. Tap relay casing lightly or measure contact continuity with power off (normally open contacts must read infinite ohms). Replace PCB relay. Turn selector to Off, press and hold Start/Cancel button until display resets and door unlock pulse clicks.

Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Ariston code F27 persists, the physical component causing On Ariston washing appliances: High inductive arc discharge during drum reversal under heavy laundry load welding reversing relay contacts on PCB. 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.