16
TROUBLESHOOTING (CONTINUED)
Diagnostic Codes
38/40GVC/Q 18k--24k, 230v
Malfunction
Error Code
on indoor unit
Repair Method/Cause
System high pressure protection E1
Poor heat exchange. Are the coils clogged or blocked? Is the ambi-
ent temperature out of system range?
Anti--- freeze Protection E2 Outdoor ambient temperature is too low
Discharge temperature sensor malfunction
(out of range)
E4 Measure the resistance value in the sensor
Low voltage protection E5 Check incoming power
Communication malfunction E6 Check wiring connection
System overload protection E8 Refer to Service Manual
Indoor board malfunction U8 Replace indoor main board
Indoor motor malfunction H6 Check motor mounting and wiring
Missing jumper from indoor board C5
No jumper on controller or installed improperly or damaged. Corres-
ponding circuit on main board has malfunction.
Return air temperature sensor malfunction F1 Measure the resistance value in the sensor
Indoor pipe temperature sensor malfunction F2 Measure the resistance value in the sensor
Outdoor ambient temperature sensor malfunc-
tion
F3 Measure the resistance value in the sensor
Condenser temperature sensor malfunction
(open or shorted)
F4 Measure the resistance value in the sensor
Discharge temperature sensor malfunction
(open or shorted)
F5 Measure the resistance value in the sensor
Overload limit, compressor speed reduction F6 Refer to Service Manual
Over current compressor speed reduction F8 System voltage is too low or system voltage is high
Compressor discharge temperature high,
compressor speed reduction
F9
Load is too great
Ambient temperature too high
Refrigerant is low
Electric expansion valve malfunction
Over voltage protection PH Check incoming power supply
Current detection malfunction U5 Replace outdoor main board
Compressor current protection P5 Refer to Service Manual. Check inverter board.
Defrosting H1 H1 signal normal operation
Compressor overload protection H3 Check overload wiring
System overload protection H4 Checked for dirty or blocked heat exchangers
IPM protection H5 IPM module over temperature, low voltage, silica grease problem
PFC (power factor correction) board protec-
tion
HC Refer to Service Manual
Compressor speed reduction H7
Check if the resistance of the compressor and the resistance to
ground is normal. If the resistance is normal, the outdoor main
board may be defective.
Ambient temperature cut off range H0 Refer to Service Manual (overload, high temperature, cutout)
Compressor start---up failure LC
Check if the resistance of the compressor and the resistance to
ground is normal. If the resistance is normal, the outdoor main
board may be defective.
Compressor phase detection error U1 Replace outdoor main board
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