Error codes › Diesel Air Heaters › Webasto SmarTemp Control 3.0 / 4.0 (controller display - not a heater code) › clear lock out
Webasto SmarTemp Control 3.0 / 4.0 (controller display - not a heater code) error code clear lock out
The heater is in a LOCK-OUT condition; the SmarTemp 3.0 / 3.0 Bluetooth / 4.0 offers to clear it. Pressing Select clears the errors and releases the lock-out.
What to check, and in what order, is in the app. The flow Webasto SmarTemp Control 3.0 / 4.0 - fault display, lock-out, low-voltage disconnect walks this code step by step with the pass/fail measurements, wiring schematics and procedures that go with it, and it works offline in the bay.
Start free trial 14 days free, no card neededDocumented in
- Webasto SmarTemp Control 3.0 / 3.0 Bluetooth Installation - Operating Instructions, P/N 5013872B (Org. 12/2022, Rev. 6/2026)Webasto Thermo & Comfort North America
- Webasto SmarTemp Control 4.0 Installation - Operating Instructions (Org. 6/2026)Webasto Thermo & Comfort North America
- Webasto Air Top Evo 40/55 Installation Manual (USA)Webasto
- Webasto Air Top Evo 40/55 Fault Codes / Troubleshooting (troubleshooting sheet)Webasto (via Butler Technik)