GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
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(2) Flowchart analyzing
1. High exhaust temperature protection (E4)
When the system shows high exhaust temperature protection for compressor, the IDU will show high
exhaust temperature fault E4, while the IDU will show the specific faulty compressor.
For example, when high exhaust temperature protection is enabled on compressor 2# of module 3# of
the ODU, IDUs will show E4 and the module will show E6, indicating that high exhaust temperature
protection is enabled on compressor 2#.
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