GREE GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
179
Troubleshooting:
2.2.4.60
“F3” Low pressure sensor error
Error display:
ODU mainboard, IDU wired controller and IDU receive light board will
display
Error judgment condition and method:
Sample the AD value of low pressure sensor through sensor detecting circuit and judge the range of
AD value; if the sampled AD value exceeds upper limit and lower limit in 30 seconds continuously, report
the error.
Possible reason
：
■Poor contact between low pressure sensor and terminal in mainboard interface
■Poor contact between low pressure sensor and pressure detection position of unit
■low pressure sensor is abnormal
■Detecting circuit of sensor is abnormal
