9.3
Faults
Fault num-
ber
Possible causes
Suggestions for resolution
F01, F02,
F03
The grid waveform is abnormal.
Contact Delta Customer Service.
Internal error.
Contact Delta Customer Service.
F05
The ambient temperature is > 60 °C.
Check the system environment.
F06,
F08,
F09,
F10
The ambient temperature is > 90 °C or < -30 °C.
Check the system environment.
Detection circuit malfunction.
Contact Delta Customer Service.
F07
The ambient temperature is < -30 °C.
Check the system environment.
Internal error.
Contact Delta Customer Service.
F13, F29
Internal error.
Contact Delta Customer Service.
F15,
F16,
F17
The DC input voltage is less than the minimum required
DC input voltage.
Check the DC input voltage on the inverter display.
There may be insufficient solar radiation.
Internal error.
Contact Delta Customer Service.
F18,
F19
The DC input voltage is less than the minimum required
DC input voltage.
Check the DC input voltage on the inverter display.
There may be insufficient solar radiation.
Internal error.
Contact Delta Customer Service.
F20
Incorrect calibration.
Check the accuracy of the voltage and power.
Internal error.
Contact Delta Customer Service.
F22
Internal error.
Contact Delta Customer Service.
F23
Internal error.
Contact Delta Customer Service.
F24
Insulation fault in the PV system.
Check the insulation of the DC inputs.
Large PV system capacitance between Plus and Ground
or Minus and Ground.
Check the capacitance, it must be < 12 µF. Install an exter-
nal transformer if necessary.
Internal error.
Contact Delta Customer Service.
F26
Internal error.
Contact Delta Customer Service.
F27
Internal error.
Contact Delta Customer Service.
F28
Internal error.
Contact Delta Customer Service.
Fault in the relay driver circuit.
Contact Delta Customer Service.
F30
Incomplete independent or parallel configuration between
the inputs.
Check the input connections.
Grounding of the PV system.
Check the insulation of the PV system.
Internal error.
Contact Delta Customer Service.
F31, F33,
F35
The DC input voltage is greater than the maximum permis-
sible DC input voltage.
Change the solar system setting so that the DC input volt-
age at DC1 is below the maximum permissible DC input
voltage.
Overvoltage during operation.
Contact Delta Customer Service.
Internal error.
Contact Delta Customer Service.
F36, F37,
F38, F39,
F40, F41
Overvoltage during operation.
Contact Delta Customer Service.
Internal error.
Contact Delta Customer Service.
91
9 Error events and troubleshooting
Faults
Installation and operation manual M70A_260 Flex RPI703M26000 EU V1.1 EN 2022-08-02
