Nortek WRC4 - Page 20

17
Table 4 Meaning of Each Error
Error
Error
Code
Error
Error
Code
Return air temperature sensor open/short
circuited
F1 Drive board communication error P6
evaporator temperature sensor open/short
circuited
F2 Compressor overheating protection H3
Indoor unit liquid valve temperature sensor
open/short circuited
b5 Indoor and outdoor units unmatched LP
Indoor gas valve temperature sensor open/
short circuited
b7
Communication line misconnected or
expansion valve error
dn
IPM temperature sensor open/short circuited P7
E7
Outdoor ambient temperature sensor open/
short circuited
F3 Pump-down Fo
Outdoor unit condenser mid-tube temperature
sensor open/short circuited
F4 Defrost or oil return
Discharge temperature sensor open/short
circuited
F5 Forced defrosting H1
Indoor and outdoor communication error E6 Compressor startup failure Lc
DC bus under-voltage protection PL High discharge temperature protection E4
DC bus over-voltage protection PH Overload protection E8
Compressor phase current sensing circuit
error
U1 Whole unit over-current protection E5
Compressor demagnetization protection HE Over phase current protection P5
PFC protection Hc Compressor desynchronizing H7
IPM Temperature Protection P8 IPM Current protection H5
Over-power protection L9
Compre s so r pha s e l o ss/ r e v e r s a l
protection
Ld
Sy s t e m charge s hortage o r bloc k a g e
protection
F0
Frequency restricted/reduced with whole
unit current protection
F8
Capacitor charging error PU
Frequency restricted/reduced with IPM
current protection
En
High pressure protection E1
Frequency restricted/reduced with high
discharge temperature
F9
Low pressure protection E3
Frequency restricted/reduced with anti-
freezing protection
FH
Compressor stalling LE
Frequen cy restricted/reduc ed with
overload protection
F6
Over-speeding LF
dc
Frequency restricted/reduced with IPM
temperature protection
EU
Drive board temperature sensor error PF Indoor unit full water error E9
AC contactor protection P9 Anti-freezing protection E2
Temperature drift protection PE AC input voltage abnormal PP
Sensor connection protection Pd Whole unit current sensing circuit error U5
DC bus voltage drop error U3 4-way valve reversing error U7
Outdoor fan 1 error protection L3 Motor stalling H6
Outdoor fan 2 error protection
compressor inhalation temperature sensor error
LA PG motor zero-crossing protection U8
Wired Remote Controller WRC4