Tesla Model 3 Charging at Mer

Tesla Model 3 Charger Won't Start a Charging Session

You have plugged in your Model 3, the charge port light is doing something weird, and nothing is happening. This is one of the most common frustrations for EV drivers. The good news is that it is almost always fixable on the spot. The cause is usually authentication, the charge port latch, or the charger itself.

Symptoms

• Charge port LED flashes amber or red after plugging in the CCS2 connector
• Touchscreen shows an error message instead of the charging screen
• Charger display says 'Waiting for vehicle' or 'Authentication failed'
• Charge port will not open when pressing the button on the connector
• Supercharger session does not start automatically after plugging in

What to Do

1. 1

   Unplug and replug the connector firmly

   Pull the connector out completely. Wait 5 seconds. Push it back in firmly until you hear a click and the charge port LED turns green or starts pulsing. On CCS2, the lower DC pins need to seat fully.

2. 2

   Check the touchscreen for error messages

   Look at the charging screen on the touchscreen. It will tell you if there is an error, if scheduled charging is active, or if the car is waiting for something. If Scheduled Charging is delaying the session, tap 'Charge Now' to override it.

3. 3

   Authenticate with the charging network

   At non-Tesla chargers, open the network's app (Ionity, Shell Recharge, or whichever network). Start the session through the app, or tap your RFID card on the charger. At Tesla Superchargers, this step is automatic.

4. 4

   Try the manual charge port release if the port is stuck

   If the charge port will not open, try tapping your Tesla key card on the B-pillar and pressing the charge port door. You can also open it from the touchscreen under Controls. In freezing weather, pour lukewarm water around the port to melt ice. Never force it.

5. 5

   Restart the touchscreen

   Hold both scroll wheels on the steering wheel for about 10 seconds until the Tesla logo appears. This restarts the infotainment system and can clear communication errors between the car and the charger.

6. 6

   Try a different charger or stall

   If nothing works, the charger may be faulty. Move to a different stall or station. At Superchargers, the Tesla app shows stall availability in real time.

Tesla Model 3 Payment Failed at the Charging Station

You plugged in, everything looked fine, and then the charger says payment failed. Or the session will not start because authentication did not go through. Payment problems are different at Tesla Superchargers versus non-Tesla CCS2 chargers, so the fix depends on where you are.

Symptoms

• Charger display shows 'Payment failed' or 'Transaction declined' after tapping a card
• Tesla Supercharger session will not start and the Tesla app shows a billing error
• Non-Tesla CCS2 charger shows 'Authentication failed' after scanning RFID or using an app
• Contactless payment terminal on the charger does not respond to your bank card
• Charging starts but stops after a few seconds with a payment-related error on the charger screen

What to Do

1. 1

   Check if this is a Tesla Supercharger or a non-Tesla station

   At Tesla Superchargers, payment is automatic through your Tesla account. At non-Tesla CCS2 chargers, you need to authenticate separately. The fix is completely different for each.

2. 2

   For Superchargers: update your payment method in the Tesla app

   Open the Tesla app, go to Account, then Payment. Check that your card is current and not expired. Add a new card if needed. Then try the Supercharger again. The session should start automatically after plugging in.

3. 3

   For non-Tesla chargers: authenticate through the network app

   Open the charging network's app (Ionity, Shell Recharge, Virta, or whichever network runs the charger). Select the charger, start the session, then plug in. Make sure the app shows your payment method is valid.

4. 4

   Try a different payment method at the charger

   If the contactless terminal failed, try the network's app instead. If the app failed, try an RFID card. If you do not have the network's app, some chargers accept ad-hoc payments through a QR code on the charger.

5. 5

   Call your bank if repeated transactions are declined

   If your card keeps getting declined at chargers, your bank may be blocking charging transactions. Call the number on the back of your card and let them know you are making EV charging payments. They can whitelist these merchants.

6. 6

   Move to a different charger if the payment terminal is broken

   If the charger's payment terminal is physically unresponsive, try a different stall. Report the broken terminal through the network's app so they can fix it.

Tesla Model 3 Charging Slower Than Expected at Charger

You plugged in your Model 3 expecting 175 kW and the touchscreen shows 50 kW. Or your home wallbox is stuck at 3 kW instead of 11 kW. Slow charging on the Model 3 is almost never a defect. It is usually the battery temperature, a charger limitation, or a setting you can fix on the touchscreen in under a minute.

Symptoms

• DC fast charging power well below the 175 kW maximum shown on the touchscreen
• AC home charging stuck at 3-4 kW instead of the expected 11 kW
• Charging speed drops sharply after reaching 50-60% on the touchscreen
• Supercharger shows lower kW than the stall is rated for
• Touchscreen charging animation shows a slow trickle instead of rapid charging

What to Do

1. 1

   Check the battery temperature on the touchscreen

   Tap the charging icon on the touchscreen. If the battery is cold, you will see a snowflake icon or a message about reduced charging speed. To fix this, use the Tesla nav to route to a Supercharger. The car will automatically precondition the battery during the drive.

2. 2

   Check your state of charge

   If you are above 80%, the slower speed is expected. For the fastest DC charging, arrive between 10-20%. The Model 3 LFP hits peak power in the 10-50% range.

3. 3

   Move to an unpaired Supercharger stall

   Look at the stall numbers. If they are labeled in pairs (1A/1B, 2A/2B), pick a stall where the paired stall is empty. At V3 or V4 Superchargers, this is not an issue.

4. 4

   Check the AC charge current limit

   On the touchscreen, go to Controls, then Charging. Look for the charge current slider or setting. Make sure it is set to the maximum value. This only affects AC charging, not Supercharging.

5. 5

   Try a different charger or stall

   If speeds are still low, the charger may be degraded. Try a different stall at the same location. On non-Tesla CCS chargers, some stations deliver less power than advertised.

6. 6

   Check for a software update

   Go to Controls, then Software on the touchscreen. If an update is available, install it. Tesla occasionally adjusts charging curves through software updates.

Station occupancy not updating in the app

The Mer app shows a station as available, but when you arrive, all connectors are occupied or out of service. The real-time status in the app can lag behind by several minutes.

Symptoms

• App shows "Available" but all connectors are in use when you arrive
• App shows a station as occupied but the chargers are visibly free
• Connector status flickers between available and occupied in the app
• Recently freed connectors still show as "In use" in the app for several minutes

How to Fix It

1. 1

   Pull to refresh the station detail in the Mer app

   On the station page, pull down to force a status refresh. The app does not always update automatically, and a manual refresh often shows the correct status.

2. 2

   Close and reopen the app

   Force-close the Mer app and reopen it. This clears any cached station data and pulls a fresh status from the server.

3. 3

   Check a third-party app for a second opinion

   Apps like Plugsurfing, A Better Route Planner, or Google Maps sometimes pull fresher data from Mer's backend. Use one of these to verify availability if the Mer app seems wrong.

4. 4

   Drive to the station if it is nearby

   If the station is less than five minutes away, it is often faster to just go and check. Occupancy can change in the time it takes to troubleshoot the app.

Third-party RFID card rejected

You are trying to authenticate with an RFID card from a roaming provider like Plugsurfing, NewMotion, or Virta, but the Mer charger rejects it. Not all third-party RFID cards are accepted at every Mer station.

Symptoms

• Charger screen shows "Card not recognized" after tapping
• The charger beeps once but nothing happens
• Your RFID card works at other networks but fails at Mer
• The charger prompts you to try again but repeated taps do not help

How to Fix It

1. 1

   Hold the card flat against the reader for three full seconds

   Do not tap and remove quickly. Some Mer readers need a longer hold to register the card. Keep it pressed flat against the RFID symbol.

2. 2

   Check if your roaming provider covers Mer stations

   Open your roaming provider's app and search for this specific Mer station. Some providers have roaming agreements with Mer but not for every station type or region.

3. 3

   Use the Mer app instead

   Download the Mer app if you do not have it. Create an account and add a payment method. You can start the session through the app even if your RFID card does not work.

4. 4

   Try contactless bank card payment

   Newer Mer stations have a contactless payment terminal. Look for a card reader with the contactless payment symbol. Tap your bank card or phone to start.

5. 5

   Try a Mer-issued RFID card for future visits

   You can order an RFID card directly from Mer through their app or website. Mer's own cards are accepted at all Mer stations without roaming issues.

Charger screen showing error but no error code

The charger screen displays a generic error message like "Error" or "Fault" without any specific code or explanation. This makes it hard to know if the problem is temporary or if the unit is broken.

Symptoms

• Charger screen shows "Error" or a red warning icon with no further detail
• The error appears before you even try to authenticate
• The error appears after plugging in but before power delivery starts
• Screen alternates between the normal start screen and the error message

How to Fix It

1. 1

   Unplug the connector and wait 30 seconds

   Some Mer chargers show transient errors after a previous session ended abnormally. Unplugging and waiting gives the charger time to reset its internal state.

2. 2

   Try the other connector on the same unit

   If the station has a second CCS2 connector, try that one. A hardware fault on one connector does not always affect the other.

3. 3

   Check if other cars are successfully charging at the station

   If nobody at the station is charging, the entire station may be down. If others are charging fine, the issue is limited to your connector.

4. 4

   Report the faulty unit in the Mer app

   Open the Mer app, find the station, and report the issue. Include which connector number has the error. This helps Mer send a technician and warns other drivers.

5. 5

   Move to a different station

   A charger with a persistent generic error is unlikely to start working on its own. Use the Mer app to find the nearest alternative station.

Cable locked and will not release in cold weather

You finished charging but the CCS2 cable will not unlock from your car. In Nordic winters, ice can form around the connector locking mechanism, making it physically difficult to release.

Symptoms

• Pressing the connector release button does not unlock the cable
• The connector feels frozen in place
• Your car shows "Charging complete" but the cable is stuck
• The locking pin on the connector is visibly iced over

How to Fix It

1. 1

   Make sure the charging session has fully ended

   The cable stays locked while a session is active. Stop the session in the Mer app or on the charger screen, then try releasing the connector again. Wait 10 seconds after the session ends.

2. 2

   Try unlocking from your car

   Most EVs have a cable release option in the infotainment system or a button near the charge port. Use your car's unlock function rather than the connector button.

3. 3

   Warm the connector gently

   If ice is the problem, pour lukewarm water (not boiling) over the connector and charge port area. You can also cup your hands around the connector to warm it with body heat. Do not use force or tools to pry it free.

4. 4

   Run the car's cabin heater for a few minutes

   Turning on the car's climate system can gradually warm the charge port area from the inside. This works slowly but can free a mildly frozen connector after 5-10 minutes.

5. 5

   Call Mer support if the cable is truly stuck

   If nothing works after 15 minutes, call the support number on the charger. Mer can remotely release the cable lock on their end. Do not pull with excessive force as this can damage both the connector and your car's charge port.

App requires location services for remote start

The Mer app asks you to enable location services before you can start a charging session, even when you are standing right next to the charger and selected it manually from the map.

Symptoms

• App shows "Enable location services to start charging" popup
• Start button is grayed out until location permission is granted
• The app worked fine before but now demands location after an update
• You can browse the map but cannot start a session without GPS enabled

How to Fix It

1. 1

   Enable location services temporarily

   Go to your phone's settings, find the Mer app, and set location access to "While Using the App." You can change it back after your session.

2. 2

   Make sure GPS has a fix

   In underground parking garages or areas with poor GPS reception, the app may not be able to confirm your location. Step outside or move closer to an open area until the app detects your position.

3. 3

   Use RFID or contactless payment instead

   If you do not want to share your location, use your RFID card or a contactless bank card to start the session. These methods do not require the app at all.

4. 4

   Scan the QR code on the charger

   Some Mer chargers have a QR code that opens the start process in a browser, bypassing the app's location requirement.

Former Grønn Kontakt station not found in Mer app

Mer acquired Grønn Kontakt in Norway, but some older stations may not appear correctly in the Mer app, especially during the transition period.

Symptoms

• Station visible on the street but not on the Mer app map
• Searching by the old Grønn Kontakt name returns no results
• QR code on the charger links to a Grønn Kontakt page that no longer works
• RFID card from Grønn Kontakt account rejected

How to Fix It

1. 1

   Update the Mer app to the latest version

   Older versions of the app may not include recently migrated Grønn Kontakt stations. Update from the App Store or Google Play.

2. 2

   Search by the station's physical address

   Instead of searching by station name, try the street address or zoom into the location on the app map. The station may appear under a new Mer name.

3. 3

   Enter the charger ID manually

   Look for a station or connector ID printed on the charger hardware. Enter this ID in the Mer app's manual start option.

4. 4

   Use contactless payment to bypass the app

   If the station has a payment terminal, tap your bank card to start. This works independently of whether the app has the station listed.