Roidmi EVA Error E2: Diagnosis and Solution for Blocked Fan

⚠️ SAFETY WARNING. This appliance is connected to the mains electricity. It is imperative to always unplug the device before any disassembly. If physical intervention seems complex and for your safety, it is recommended to rely on a qualified technician. ReeFix provides this diagnosis EXCLUSIVELY for educational and informational purposes.

QUICK TEST

The E2 error indicates that the mainboard microcontroller does not receive the tachometer signal (Hall effect sensor) from the drying fan within 3-5 seconds of starting the cycle. To prevent overheating of the PTC resistor, the system enters an immediate lock out.

*This often happens when moisture from the mop washing station pushes microfiber lint and dust into the fan scroll, creating a mechanical block.

If you encounter issues related to washing or the pad cleaning cycle in the base station, also consult our guide on Dreame L10 Ultra Mop Not Washing Error: Diagnosis Guide. *

Perform this 2-minute check sequence:

1. Electrical isolation: Unplug the 230V power plug from the wall and remove the clean and dirty water tanks.
2. Duct inspection: Flip the base over or access the lower drying channel; check if the air nozzle has lint accumulation or detergent crusts.
3. Mechanical start test: Insert a small non-metallic tool through the grille and try to rotate the centrifugal fan blades.

DECISION TREE

Based on the outcome of the quick test, identify the root cause and evaluate the economic feasibility:

• Mechanical obstruction from lint (60% of cases)
  • Symptom: The impeller resists or is visibly jammed by wet dirt.
  • Action: Manual duct cleaning. Cost: €0 (DIY in 15 minutes).
• Brushless motor or fan Hall sensor failure (25% of cases)
  • Symptom: The impeller rotates freely by hand, but the fan does not start or error E2 appears immediately.
  • Action: Replacement of the blower component. Spare part: Roidmi EVA base blower fan (~€20-€35).
• MOSFET driver damage on motherboard (10% of cases)
  • Symptom: Supply voltage (12V/24V) absent at fan connector during startup phase.
  • Action: Replacement of the base station control board. Spare part: Roidmi EVA base station motherboard (~€60-€90).
• False contact / Wiring oxidation (5% of cases)
  • Symptom: Intermittent error, presence of condensation on internal connectors.
  • Action: Treatment with dry contact cleaner spray.

CONFIRMED DIAGNOSIS

If external cleaning does not resolve the E2 alarm, you need to disassemble the rear casing of the charging station using a Torx and Phillips precision screwdriver set.

Recommended testing tools

• Professional digital multimeter to measure the presence of the TACH signal and DC voltage across the JST connector.
• Silicone grease for electronics to apply on sleeve bearings if the motor shows only static friction from oxidation.

Summary report for the service center

"The Roidmi EVA base station displays error E2 at the start of the mop drying cycle. Verification of VDC driving voltage at the centrifugal fan connector, continuity of the tachometer feedback line, and condition of SMD MOSFETs on the motherboard is requested."

Before replacing hardware, always proceed with removing any obstructions or lint from the air duct. If the impeller spins freely by hand but error E2 persists, replace the blower fan; if the new fan receives no power, the motherboard will need to be replaced.

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