Error codes › Diesel Air Heaters › Webasto SmarTemp Control 3.0 / 4.0 (controller display - not a heater code) › PM reminder (run heater 20 minutes)
Webasto SmarTemp Control 3.0 / 4.0 (controller display - not a heater code) error code PM reminder (run heater 20 minutes)
Preventive-maintenance reminder, not a fault: the heater has not run for 30 days. A message asks the operator to run the heater for 20 minutes and the indicator lights flash red. Start the 20-minute cycle or Snooze (postpones to 12:00 PM the next day); the reminder can be disabled.
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.
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- 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