L02 on a Technibel S.A.S. Technibel PHRIE / PHIE inverter monobloc air-to-water: A2 and A3 board settings incompatible (wrong spare part or parameters)
Short answer
On a Technibel S.A.S. heat pump, L02 means: A2 and A3 board settings incompatible (wrong spare part or parameters). The heat pump stops until the fault clears or is reset. An engineer is needed to fix the cause.
Reviewed 23 September 2026 · 1 source
What it means
The manual says: A2 and A3 board settings incompatible (wrong spare part or parameters).
Likely causes:
- Wrong spare board or parameter setting.
Is it safe?
| Does the heat pump stop? | Yes |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The heat pump stops until the fault clears or is reset.
Resetting itself: Manual reset: fault memorised by A2 board; reset by A2 RESET button (5 s), setting system control to OFF, or switching off power (power-off recommended for E15/E16/E20/L02/L08/L09/L10/L13/F29/F31).
What you can check
- Note the code/LED pattern and the model from the rating plate, then contact a heat pump/refrigeration engineer.
- Check the heat pump's breaker/isolator at the consumer unit is on.
What the engineer will check
- Check EEPROM parameters of A2 and A3.
- Check A2 board.
Who to ask for: refrigeration / heat pump engineer.
Certification: Electrical competence for work inside the unit.
What you might notice
Sources
- Technibel PHRIE / PHIE inverter monoblock air to water heat pump, medium temperature, R410A - Service Manual (Jun. 2015, 10 12 211 - GB - 06) ↗ · 10 12 211 - GB - 06 · page 97 · Reviewed 23 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 23 September 2026