OUTDOOR UNIT DIAGNOSTIC GUIDES
T
he systems are equipped with a diagnostic code display LED on both the indoor and outdoor units. The outdoor
diagnostic is
displayed on the outdoor unit microprocessor board. There may be error codes displayed on the indoor unit that m
ay
relate to outdoor unit
issues
.
A
lways check the diagnostic codes displayed on the indoor unit first.
In standby, the LED displays “
− −
”.
In the compressor operation, the LED displays the running frequency.
In the defrosting mode, the LED displays “
dF
” or alternative displays between the running frequency and “
dF
” (each appears for 0.5s).
During the compressor pre−heating cycle, the LED displays “
PH
” or alternative displays between the running frequency and “
PH
”(each
appears for 0.5s).
During the oil return process, the LED displays “
RO
” or alternative displays between the running frequency and “
RO
”(each appears for 0.5s).
In the low ambient cooling mode, the LED displays “
LC
” or alternative displays between the running frequency and “
LC
” (each appears for 0.5s).
In the forced cooling mode, the LED displays “
FC
” or alternative displays between the running frequency and “
FC
” (each appears for 0.5s).
When PFC module protection occurs three times within 15 minutes, the LED displays “
E6
” or alternative displays between the running
frequency and “
E6
” (each appears for 0.5s).
In protection or malfunction, the LED displays an error code or a protection code.
The diagnostic codes displayed on the outdoor units are listed on Table 1
Table 1
0
—Outdoor Unit Error Display
OUTDOOR UNIT
DISPLAY
LED STATUS
INDOOR UNIT
DISPLAY
E0
Outdoor EEPROM malfunction
F4
E2
Communication malfunction between indoor and outdoor units
E1
E3
Communication malfunction between IPM board and outdoor main board
— —
E4
Open or short circuit of outdoor temperature sensor (T3
、
T4
、
T5
、
T2B)
F2/F1/F3/F6
E5
Voltage protection
P1
E6
PFC module protection
— —
E8
Outdoor fan speed has been out of control (Only for DC fan motor models)
F5
E9
Wrong wiring connection of 2
7
K indoor unit
— —
F1
No A Indoor unit coil outlet temp. sensor or connector of sensor is defective
— —
F2
No B Indoor unit coil outlet temp. sensor or connector of sensor is defective
— —
F3
No C Indoor unit coil outlet temp. sensor or connector of sensor is defective
— —
F4
No D Indoor unit coil outlet temp. sensor or connector of sensor is defective
— —
F5
No E Indoor unit coil outlet temp. sensor or connector of sensor is defective
— —
F6
No F Indoor unit coil outlet temp. sensor or connector of sensor is defective
— —
P0
Temperature protection of compressor top
P2
P1
High pressure protection
P2
P2
Low pressure protection
P2
P3
Current protection of compressor
F0
P4
Temperature protection of compressor discharge
— —
P5
High temperature protection of condenser
— —
P6
IPM module protection
P0
All specifications subject to change without notice.
©20
2
1
ECR International, Inc.
2201 Dwyer Avenue, Utica, NY 13501
Tel. 800
325
5479
www.ecrinternational.com
