Chigo CHV Mini Series - Page 93

92 201908
CHV Mini Series Service Manual
CHV Mini VRF 50/60Hz
5.6 E8: T5 Exhaust temperature sensor fault
E8
Check if the T5 exhaust temperature sensor
connector is loose
Yes
Connect it well
No
Pull out the exhaust temperature sensor
plug and measure the resistance
If multimeter displays 0Ω or OL
Normal resistance: 50K
Replace the sensor
Yes
Replace outdoor main PCB
5.7 E9: AC over-voltage / under-voltage protection
E9
Check the voltage between A-N
Judge whether the input voltage is higher than 265V
Yes
Check if the transformer has a normal output of about 4.5V AC
voltage
Contact the power supply
department
NO
If higher, replace the
main PCB
Check if the half-wave rectified voltage ((1.414 ÷
2 × 4.5) - 0.7V = 2.5V) is higher than normal value
If higher, replace the
main PCB
Yes
If all the above voltages are normal, the chip port
is broken, replace the main PCB
NO