Electrolux E52
Tachogenerator Fault
High severityExpert Guide
SeverityHigh
What Your Machine Is Actually Telling You
The tachogenerator (or tacho) is a small speed sensor mounted on the end of the motor shaft. It works like a tiny generator — as the motor spins, the tacho produces a small AC voltage proportional to the speed. The control board reads this voltage to know exactly how fast the drum is rotating.
This feedback is critical because the board constantly adjusts motor power to maintain the correct speed for each phase: slow tumbling during wash (~50 RPM), medium redistribution (~100 RPM), and high-speed spin (~1000-1400 RPM).
E52 means the board is sending power to the motor but getting no speed feedback from the tacho. Without speed feedback, the board can't control the motor safely — the drum could accelerate uncontrollably — so it shuts everything down.
How the tacho works mechanically: It's a small coil of wire wrapped around a magnet on the motor shaft. As the shaft rotates, the magnet induces voltage in the coil. If the coil wire breaks (open circuit), the connector is loose, or the magnet has come off the shaft, the signal disappears.
Common causes:
1. Loose connector (45%) — the tacho connector is a small 2-pin plug that vibration can work loose over time.
2. Tacho coil broken (25%) — the fine wire inside the coil breaks from heat cycling or vibration.
3. Magnet displaced (15%) — the permanent magnet on the shaft can come unglued.
4. Wiring issue between tacho and board (10%) — a wire break in the harness.
5. Board input failure (5%) — the board's tachometer input circuit has failed.
This feedback is critical because the board constantly adjusts motor power to maintain the correct speed for each phase: slow tumbling during wash (~50 RPM), medium redistribution (~100 RPM), and high-speed spin (~1000-1400 RPM).
E52 means the board is sending power to the motor but getting no speed feedback from the tacho. Without speed feedback, the board can't control the motor safely — the drum could accelerate uncontrollably — so it shuts everything down.
How the tacho works mechanically: It's a small coil of wire wrapped around a magnet on the motor shaft. As the shaft rotates, the magnet induces voltage in the coil. If the coil wire breaks (open circuit), the connector is loose, or the magnet has come off the shaft, the signal disappears.
Common causes:
1. Loose connector (45%) — the tacho connector is a small 2-pin plug that vibration can work loose over time.
2. Tacho coil broken (25%) — the fine wire inside the coil breaks from heat cycling or vibration.
3. Magnet displaced (15%) — the permanent magnet on the shaft can come unglued.
4. Wiring issue between tacho and board (10%) — a wire break in the harness.
5. Board input failure (5%) — the board's tachometer input circuit has failed.
What You're Probably Seeing Right Now
- The drum doesn't move at all — the board won't even attempt to run the motor without speed feedback.
- The drum starts spinning briefly then stops immediately with E52 — the board starts the motor, detects no speed signal within the first few rotations, and aborts.
- The motor runs at full speed with no control for a brief second before the board cuts power — this dangerous situation is why the board doesn't continue without tacho feedback.
- E52 appeared after the machine was moved or bumped — the tacho connector may have vibrated loose.
- The machine worked fine but now intermittently shows E52 — the connector is on the edge of losing contact, and vibration during spin sometimes breaks the connection.
DIY Fix — From Easiest to Hardest
1
Power Reset (2 minutes)
In rare cases, E52 is a board glitch:
1. Unplug for **10 minutes.**
2. Plug back in and try starting a cycle.
3. If the drum spins normally and E52 doesn't return, it was a one-time event.
**If E52 returns within seconds of the motor trying to start:** The problem is physical — proceed to the next steps.
1. Unplug for **10 minutes.**
2. Plug back in and try starting a cycle.
3. If the drum spins normally and E52 doesn't return, it was a one-time event.
**If E52 returns within seconds of the motor trying to start:** The problem is physical — proceed to the next steps.
2
Reseat the Tachogenerator Connector — The Most Common Fix (15 minutes)
This fixes **~45% of E52 cases:**
1. **Unplug the machine.**
2. **Remove the back panel** (typically 4-8 screws).
3. Locate the motor at the bottom. On the **end of the motor** (the end opposite the pulley), you'll see a small plastic cover — this is the tacho housing.
4. Find the **small 2-pin connector** coming from the tacho. It plugs into the main wiring harness.
5. **Unplug the connector**, inspect for corrosion, clean the pins with electrical contact cleaner, and **plug it back in firmly** until it clicks.
6. Also check that the wires aren't chafing against the motor housing or any sharp edges.
**Pro tip:** While you're here, give the connector a slight tug — it should resist. If it pulls off easily, the connector clips may be worn. Wrap a small piece of electrical tape around the connection to keep it secure.
1. **Unplug the machine.**
2. **Remove the back panel** (typically 4-8 screws).
3. Locate the motor at the bottom. On the **end of the motor** (the end opposite the pulley), you'll see a small plastic cover — this is the tacho housing.
4. Find the **small 2-pin connector** coming from the tacho. It plugs into the main wiring harness.
5. **Unplug the connector**, inspect for corrosion, clean the pins with electrical contact cleaner, and **plug it back in firmly** until it clicks.
6. Also check that the wires aren't chafing against the motor housing or any sharp edges.
**Pro tip:** While you're here, give the connector a slight tug — it should resist. If it pulls off easily, the connector clips may be worn. Wrap a small piece of electrical tape around the connection to keep it secure.
3
Check the Tacho Magnet (5 minutes)
The magnet is visible once you access the tacho:
1. The tacho coil sits around a **circular magnet** on the motor shaft.
2. **Visually inspect** — is the magnet in place? On some motors, you can see if it's shifted or has come loose.
3. **Spin the motor shaft by hand** (with the belt still on, turn the drum to rotate the motor). The magnet should rotate smoothly with the shaft.
4. If the magnet has **detached from the shaft**, it needs to be re-bonded with appropriate adhesive (cyanoacrylate/super glue works for this application — clean both surfaces first).
**Warning sign:** Fine rust-colored dust around the tacho area suggests the magnet has been rubbing against the coil housing.
1. The tacho coil sits around a **circular magnet** on the motor shaft.
2. **Visually inspect** — is the magnet in place? On some motors, you can see if it's shifted or has come loose.
3. **Spin the motor shaft by hand** (with the belt still on, turn the drum to rotate the motor). The magnet should rotate smoothly with the shaft.
4. If the magnet has **detached from the shaft**, it needs to be re-bonded with appropriate adhesive (cyanoacrylate/super glue works for this application — clean both surfaces first).
**Warning sign:** Fine rust-colored dust around the tacho area suggests the magnet has been rubbing against the coil housing.
4
Test the Tacho Coil with a Multimeter (5 minutes)
Confirm whether the coil is working:
1. **Unplug the machine** and disconnect the tacho connector.
2. Set your multimeter to **resistance (Ω)** mode.
3. Measure across the **two tacho wires/pins** on the tacho itself (not the harness side).
4. **Expected reading:** Typically **50-200Ω** (varies by model). This is the resistance of the coil wire.
5. **If you read OL (infinity):** The coil wire is broken — tacho needs replacement.
6. **If you read 0Ω (zero):** The coil is shorted — tacho needs replacement.
7. **If resistance is in normal range:** The tacho coil is fine. The problem is the connector, wiring, or board.
**Bonus test:** Set your multimeter to **AC voltage**. Reconnect the tacho and slowly spin the drum by hand. The tacho should produce a small AC voltage (a few volts). No voltage despite normal resistance = magnet issue.
1. **Unplug the machine** and disconnect the tacho connector.
2. Set your multimeter to **resistance (Ω)** mode.
3. Measure across the **two tacho wires/pins** on the tacho itself (not the harness side).
4. **Expected reading:** Typically **50-200Ω** (varies by model). This is the resistance of the coil wire.
5. **If you read OL (infinity):** The coil wire is broken — tacho needs replacement.
6. **If you read 0Ω (zero):** The coil is shorted — tacho needs replacement.
7. **If resistance is in normal range:** The tacho coil is fine. The problem is the connector, wiring, or board.
**Bonus test:** Set your multimeter to **AC voltage**. Reconnect the tacho and slowly spin the drum by hand. The tacho should produce a small AC voltage (a few volts). No voltage despite normal resistance = magnet issue.
5
Replace the Tachogenerator (15 minutes)
If the coil or magnet has failed:
1. **Order the correct replacement** — tachogenerators are model-specific. Use your model number.
2. On most Electrolux motors, the tacho is held by a **retaining clip or small screw** at the end of the motor.
3. Remove the old tacho — pull straight off the motor shaft end.
4. Install the new tacho — push it on and secure with the clip/screw.
5. Connect the 2-pin connector.
6. Reassemble and test.
**Note:** On some newer motors, the tacho is integrated into the motor and can't be replaced separately. In that case, the entire motor needs replacement — but this is rare.
1. **Order the correct replacement** — tachogenerators are model-specific. Use your model number.
2. On most Electrolux motors, the tacho is held by a **retaining clip or small screw** at the end of the motor.
3. Remove the old tacho — pull straight off the motor shaft end.
4. Install the new tacho — push it on and secure with the clip/screw.
5. Connect the 2-pin connector.
6. Reassemble and test.
**Note:** On some newer motors, the tacho is integrated into the motor and can't be replaced separately. In that case, the entire motor needs replacement — but this is rare.
6
Check Wiring Harness (10 minutes)
If the tacho tests fine but E52 persists:
1. **Trace the tacho wires** from the connector back toward the control board.
2. Look for **broken wires, chafed insulation, or damaged connectors** along the route.
3. Pay special attention to areas where wires pass **near the motor mounting bracket** or **through grommets in the frame** — these are common break points.
4. A broken wire can be repaired with solder and heat-shrink tubing.
**If wiring is intact:** The board's tacho input circuit may have failed. This requires professional board-level diagnosis.
1. **Trace the tacho wires** from the connector back toward the control board.
2. Look for **broken wires, chafed insulation, or damaged connectors** along the route.
3. Pay special attention to areas where wires pass **near the motor mounting bracket** or **through grommets in the frame** — these are common break points.
4. A broken wire can be repaired with solder and heat-shrink tubing.
**If wiring is intact:** The board's tacho input circuit may have failed. This requires professional board-level diagnosis.
When to Call a Pro
- •Tacho tests fine, wiring is intact — the control board's tachometer input has failed. Board replacement needed: $300-$500 with labor.
- •Tacho integrated into motor (non-replaceable separately) — motor replacement is the only option: $300-$500.
- •E52 combined with E50 — both motor fault and speed signal fault suggest a more fundamental motor or board failure. Professional diagnosis: $80-$150.
- •You can't access the motor — on some models, the motor is difficult to reach without tilting the machine. Professional service: $80-$150 for diagnosis.
What It'll Cost You
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