A90 HP pressure switch signals the intervention of the High Pressure switch.
This message necessarily require the intervention of a technician.
Description
It is caused by the intervention of the safety pressure switch "P" or by a failure of the digital input of the board.
Reset
When pressure switch return to normal status error reset automatically.
Checks
The pressure switch P can intervene if
- Ambient temperature> 43°C
- Failure to respect the distances for air recirculation
- Dirty condenser filter - Condenser fan does not work
- Pressure switch calibrated or malfunctioning (intervention at 29.5 bar and reset at 24.5)
- Pressure switch contact polarity and P23 = 0
- Check that the liquid switch valve is not closed and blocked
- Check card input For water-cooled systems, check the water tap
- Check the water tap