Autoterm / Planar AIR (2D/4D/8D/9D) error code 33
Heater control is blocked - only for AIR-8D (PU-5: 16 blinks)
What to check, and in what order, is in the app. The flow Diesel Air Heater — Overheat Shutdown 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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- Autoterm AIR fault-code table + AIR Repair Manual + PU-5 Operation Manual v2025Autoterm
- Autoterm AIR User's Manual with installation instructions v12.2018-1 (PLANAR series)
Related codes
- 08/29Flame failure during operation of the heater (PU-5: 3 blinks)
- 30Heater does not start (PU-5: blink count not separately listed)
- 31Overheating of hot-air outlet temperature sensor - only for AIR-8D…
- 32Faulty temperature sensor at air intake - only for AIR-8D (PU-5: 17…
- 34Wrong component assembly - only for AIR-8D (PU-5: 19 blinks)
- 35Flame failure - only for AIR-8D (PU-5: 13 blinks)
- 36Flame indicator temperature above normal - only for AIR-8D (PU-5: 20…
- 78Flame failure during operation (PU-5: 3 blinks)