Skip to content
Semi-Functional Tech
Color theme

Long-Term Review of the Tesla Wall Connector 3: It Lasted About 4½ Years

By Brad Hager3 min read
Tesla Wall Connector Overheating

By Brad Hager · October 13, 2026

This is leading with the conclusion, but my Tesla Wall Connector 3 only lasted about 4 and a half years before it started to overheat every time I was charging my car. Based on some of the logs you can access yourself via the API endpoints on the Wall Connector, you can see that there have been 258 thermal foldbacks (overheating events). When this overheating starts, the Wall Connector lowers the amps it is providing to the vehicle.

Given I only plug in my Tesla once a day in the evening, the Wall Connector technically started to have issues less than 4 years ago, and the warranty on the Wall Connector is 4 years for residential use. But since I didn’t notice, and the Tesla app doesn’t alert the user, no one noticed until recently, and now the Wall Connector is out of warranty.

Tesla Wall Connector Stats
Thermal foldbacks
258
Lifetime alerts
2,113
Charge starts
5,360
Lifetime energy delivered
95.9 MWh

Tesla needs to alert owners

Tesla really should implement alerting in their app for overheating issues, especially if this issue occurs day after day. I’m also not sure what the risk is with these overheating issues and how urgently I should stop using the charger. Tesla support seemed to imply that I should replace it but didn’t specifically come out and say to replace it.

What’s next

So I have ordered a new Universal Wall Connector ($660 USD) from Tesla instead of another Wall Connector 3 ($585 USD), just in case the current Wall Connector is damaged, dangerous or going to stop working “soon.” So a future review is incoming, and maybe some updates to this article as I take apart the overheating Wall Connector and replace it with the Universal Wall Connector.

One of the first things I’ll check during the teardown is the input terminals where the supply wires connect. A loose or degraded connection there is a common cause of heat in high-current chargers, and the input_thermopile_uv value in the API appears to monitor that area. If you check your own, turn off the breaker first or have an electrician do it.

Another project I may put together is my own monitoring script or container to alert me of any future issues along these same lines, since Tesla has not implemented this.

The data from the Wall Connector API

The Wall Connector 3 exposes a few read-only endpoints on your local network. Browse to the charger’s IP address followed by the paths below to see your own numbers.

Check your own Wall Connector

  1. Find the Wall Connector’s IP address in your router’s list of connected devices.

  2. From a device on the same network, open http://<wall-connector-ip>/api/1/lifetime in a browser.

  3. Look at thermal_foldbacks. If it’s climbing, your charger has been throttling due to heat, and the Tesla app won’t tell you.

/api/1/lifetime

{
  "contactor_cycles": 5360,
  "contactor_cycles_loaded": 88,
  "alert_count": 2113,
  "thermal_foldbacks": 258,
  "avg_startup_temp": 0,
  "charge_starts": 5360,
  "energy_wh": 95894950,
  "connector_cycles": 1434,
  "uptime_s": 135903358,
  "charging_time_s": 9764317
}

/api/1/version

{
  "firmware_version": "26.34.0+g1a5f79be65b2b4",
  "git_branch": "HEAD",
  "part_number": "1457768-02-G",
  "serial_number": "<Removed>",
  "web_service": "h3-hermes-prd.sn.tesla.services",
  "IEEE1547VfTripsCrc": "BB5EABC5",
  "IEEE1547RideThruMomentaryCessationCrc": "753C17D3",
  "IEEE1547CombinedComplianceCrc": "81DD267F"
}

/api/1/vitals

{
  "contactor_closed": false,
  "vehicle_connected": false,
  "session_s": 0,
  "grid_v": 239.9,
  "grid_hz": 59.825,
  "vehicle_current_a": 0,
  "currentA_a": 0,
  "currentB_a": 0,
  "currentC_a": 0,
  "currentN_a": 0,
  "voltageA_v": 2.1,
  "voltageB_v": 2.1,
  "voltageC_v": 2.1,
  "relay_k1_v": 12,
  "relay_k2_v": 0,
  "pcba_temp_c": 25.9,
  "handle_temp_c": 23.1,
  "mcu_temp_c": 30.6,
  "uptime_s": 570230,
  "input_thermopile_uv": -160,
  "prox_v": 0,
  "pilot_high_v": 11.9,
  "pilot_low_v": 11.8,
  "session_energy_wh": 21317.699,
  "config_status": 5,
  "evse_state": 1,
  "current_alerts": [],
  "evse_not_ready_reasons": [4, 8]
}

Sources

Have a Wall Connector with high thermal foldback counts? Let me know at support@semifunctional.tech.

Share this post

Related