Bosch Mini Split F2 Error Code

Updated 2026-08-30 · review status: manual-verified · reviewed by MiniSplitDecoder Editorial Team Last verified: 2026-08-30

Check your model first

  • Bosch Climate 5000 Gen 2 / legacy single-zone (BMS500-A..)
  • Bosch multi-zone (variant meaning)
  • Bosch Climate 5000 Gen 2 / legacy single-zone
  • Bosch multi-zone outdoor board

Match the model on your equipment label to the linked manufacturer documentation. The same code can mean different things across model families.

Quick answer

F2 on a Bosch Climate 5000 Gen 2 single-zone system means an outdoor coil temperature sensor error - the condenser (T3) thermistor is open, shorted, or drifted. One power-cycle reset is the safe DIY step; sensor and PCB checks are technician work.

Severity: medium · DIY difficulty: easy

Safety

Stop at the breaker power-cycle and any plug-accessible checks (filters, remote settings, visible wiring). The outdoor unit's capacitor holds a lethal charge and the refrigerant circuit is both pressurized and (on R-32 units) flammable — opening panels or servicing the sealed system is licensed-technician work (EPA 608).

What F2 means

F2 means an outdoor coil temperature sensor error on Bosch Climate 5000 Gen 2 / legacy single-zone systems (indoor lamp group: 2 lit) - the outdoor coil/condenser thermistor is open circuit or short circuited. Heat Pump Answers' Gen 2 table matches (F2 = outdoor coil sensor). On a multi-zone outdoor board, F2 instead names indoor head B as the room with a failed sensor.

Code meaning varies by series

  • Bosch Climate 5000 Gen 2 / legacy single-zone: Outdoor coil temperature sensor error (indoor LED: 2 lit)
  • Bosch multi-zone outdoor board: On a Bosch multi-zone outdoor board the F1-F6 range instead names which indoor head (A-F) has a failed sensor, not the fault type - say which display you read the code on. F2 = indoor unit B

First checks before service

This page currently documents the safe reset triage. If the code returns, use the linked source manual or a qualified technician for code-specific diagnosis.

  1. 1. One-time fault event (power disturbance or transient sensor reading) common DIY

    Check: Power-cycle at the breaker/disconnect (or unplug for CPAP), restore, and run the system while watching for the code.

    Fix: If the code does not return after a full run cycle, the fault was transient — monitor, no repair needed.

  2. 2. Fault persists after a clean reset occasional pro only

    Check: If the code returns immediately or every session, note the conditions (startup, heating, after rain).

    Fix: A persisting code points at the component the manual assigns to this code — that repair is technician territory.

Related codes

Cross-references for the same fault family, by brand:

Bosch F1 · Bosch F3

Commonly searched as: "bosch f2" · "bosch error code f2" · "bosch air conditioner f2"

Sources

Related Mini Split guides

Mini-Split Communication Error: DIY Checks · Mini-Split Flashing Light Decoder: Blink Patterns · Mini-Split Maintenance Checklist: Seasonal DIY Tasks · Mini-Split Not Cooling: Ranked Causes and DIY Checks