Alaska E28

Alaska error code E28 indicates: Alaska WA / WM Professional & Domestic Front-Load Washing Machine Series: Diagnostic fault code E28 registered by the microcomputer controller. Door interlock power relay driver contact on main PCB fails to engage or remains closed.

The primary root cause for Alaska code E28 is: On Alaska commercial private label appliances distributed by Metro AG engineered with Metro OEM electronic washing chassis with 1950W calrod heater, 10 kΩ NTC sensor, and synchronous drain pump (165-215 Ω): relay coil open circuit, driving transistor breakdown, or contact erosion caused by arcing. Metrological tolerance verification: relay coil resistance 360-440 Ω at 12 VDC; switched contacts open > 1 MΩ, closed < 0.2 Ω..

To resolve error code E28: Disconnect mains power before servicing. Unplug the harness at the main PCB and use a calibrated digital multimeter: measure 12V DC coil control voltage at PCB test pad; check relay contact continuity with digital multimeter. Inspect contacts for pin oxidation or loose terminals. Replace defective part if out of tolerance, re-energize and clear error: rotate the program selector dial to Stop, press and hold the Start/Pause button for 5 seconds until all status LEDs blink once, then switch to Rinse.

Resetting power (unplugging for 5–10 minutes) clears temporary memory errors. However, if Alaska code E28 persists, the physical component causing On Alaska commercial private label appliances distributed by Metro AG engineered with Metro OEM electronic washing chassis with 1950W calrod heater, 10 kΩ NTC sensor, and synchronous drain pump (165-215 Ω): relay coil open circuit, driving transistor breakdown, or contact erosion caused by arcing. Metrological tolerance verification: relay coil resistance 360-440 Ω at 12 VDC; switched contacts open > 1 MΩ, closed < 0.2 Ω. must be inspected or replaced.

Set a digital multimeter to ohms (Ω). Disconnect power and test NTC Temperature Sensor Probe (Thermistor) across Across sensor pins 1-2 (unplugged harness). Expected nominal reading is 4.8kΩ–12kΩ (at 20°C–25°C). Tolerance: Negative temperature coefficient: resistance drops smoothly when warmed with fingers. OL = open circuit..

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.