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How to Troubleshoot Controller Charger Issues? (Gen 3) Follow

How to Troubleshoot Controller Charger Issues

Diagnose and resolve controller charging faults — from power supply checks to battery voltage and error codes.

Use this article when: One or more controllers are not charging, a charger display is showing an error code, or a controller battery appears dead after sitting on the charger overnight.
Warning: Do not leave a controller connected to a charger that has a fault. A faulty charger — or one that is not connected to mains power — will slowly drain and permanently damage the controller battery. If the power outlet is switched off or any cable is disconnected, unplug the controller from the charger immediately before continuing to investigate.

Tools Required

  • Controller charger

On this page:

Quick Triage — How Many Controllers Are Affected?

Before starting the step-by-step process, identify how many controllers are affected. This tells you immediately whether the fault is likely in the charger or an individual controller.

Situation Likely cause Start here
2 or more controllers not charging at the same time Charger or power supply fault — not the individual controllers Step 1
Single controller not charging, others fine Could be charger slot, cable, or the controller itself Step 1, then swap test (Step 2)
Controller won't charge after sitting overnight on the charger Unpowered charger has drained the battery — battery may be damaged Step 1, then battery voltage check (Step 4)

Charger Display — Error Codes & Status Readings

The charger display shows status messages and voltage readings during charging. If you see an error code such as ER-2, use the table below to identify the cause and the correct next action.

Info: Do not leave a controller connected to the charger while investigating an error code. Unplug the controller from the charger first, then use the table below to determine next steps.
Display Meaning Action
FULL Controller is fully charged. The charger will give long beeps. Return controller to operations.
Voltage reading
(e.g. 7.2V / 8.4V)		 Normal charging in progress. Two cell voltages and a total are displayed. No action required. Leave to complete charging.
Below 7V total Battery may be undervoltage or damaged. The charger may not be able to recover it. Monitor for 10 minutes. If voltage does not rise, the battery needs to be replaced. See Step 4.
ER-2 Charger error — typically indicates a connection issue between the charger and the controller, or a faulty charging port on the controller. Unplug the controller immediately. Inspect the charger plug and controller charging port for debris or damage. Try a known-good controller on the same slot. If ER-2 persists across multiple controllers, log a ticket to Client Services.
No display / blank screen The charger has no power. Unplug the controller from the charger immediately, then start at Step 1.

Step 1: Power Outlet and LED

  1. Check that the power outlet switch is in the ON position.
  2. Confirm the charger's LED is lit. If the LED is off, the charger has no power.
Warning: If the outlet is switched off and the controller is still plugged into the charger, unplug the controller from the charger immediately. An unpowered charger that remains connected to a controller will drain and damage the battery.

✅ This resolved the issue — return the charger to operations.

❌ Still not resolved — continue to Step 2.

Step 2: Swap Test — Isolate Charger vs. Controller

Before checking any cables, run a quick swap test to determine whether the fault is in the charger or the controller. This is the fastest way to identify where the problem lies.

  1. Try the affected controller on a different charger slot or a spare charger unit.
  2. Try a known-good controller on the same charger slot that failed.

✅ Controller charges on a different slot or unit — the fault is in the original charger slot or unit. Continue to Step 3 to check cables on that charger.

❌ Controller still will not charge on any slot — the fault is likely in the controller itself. Check battery voltage in Step 4 and log a ticket if needed.

Step 3: Power Cable and Charging Cable

  1. Check that the power cable is connected to the charger.
  2. Check that the charging 3-pin cable is fully seated in the charger port.
  3. Re-seat both cables and attempt to charge again.

✅ This resolved the issue — return the charger to operations.

❌ Still not resolved — continue to Step 4.

Step 4: Check Battery Voltage

A flat or damaged battery can prevent the charger from working correctly, even when the charger itself is fine. Check the battery voltage using the charger display — this does not require opening the controller.

  1. Disconnect the charger from mains power.
  2. Connect the charger plug to the controller. The display will show two cell voltages and a total.
  3. Below 7V total — the battery may be under voltage or damaged. Allow 10 minutes to see if the voltage rises. If it does not, the battery needs to be replaced.
  4. 7V or above — the battery is healthy. The fault is in the charger unit or cables. Continue to Step 5.
Info: Replacement controller batteries are available in the ZL Store under item ZL-03-02-10. If the battery cannot be recovered, remove the controller from operations until a replacement is available.

✅ Battery healthy (7V+) and charger still not working — continue to Step 5.

❌ Battery below 7V and does not recover — replace the battery (ZL-03-02-10). If unavailable, remove the controller from operations and log a ticket to Client Services.

Step 5: Main Power Cable

  1. Check that the main power cable connecting the power supply unit to the charger chassis is firmly and correctly seated at both ends.

✅ This resolved the issue — return the charger to operations.

❌ Still not resolved — continue to Step 6 and log a ticket to Client Services.

Step 6: Contact Client Services

If all steps above have not resolved the issue, log a ticket to Client Services. The more detail provided, the faster the issue can be diagnosed.

Have Ready When Logging:

Controller number(s) affected
Reading shown on the charger display (voltage, error code, or blank)
Whether the issue affects a single controller or multiple units
Troubleshooting steps already attempted
Article When to use
How do I check the battery health of a controller? Battery voltage is below 7V — use this for a full battery diagnostic including the cell health checker tool
How do I troubleshoot the Controller not powering on? (Wrist Tracker) Controller won't turn on after a charge attempt — includes internal inspection and component replacement steps
Controller LED ball flashing red LED is still red after charging has completed
Step 15: Setup Your Controller Charger Reference for correct charger assembly if the unit was recently installed or moved

Keywords: Controller charger issues · Controller charger problems · Controller charger not working · Controller not charging · ER-2 charger error · Controller battery dead · Controller battery voltage · Multiple controllers not charging · Charger display error · Controller charger ER2

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