Friedrich FSHSW36A3A Installation And Operation Manual page 52

Wired Controller(Optional)
Error
Return air temperature sensor open/
short circuited
evaporator temperature sensor open/
short circuited
Indoor unit liquid valve temperature
sensor open/short circuited
Indoor gas valve temperature sensor
open/ short circuited
IPM temperature sensor open/short
circuited
Outdoor ambient temperature sensor
open/ short circuited
Outdoor unit condenser mid-tube
temperature sensor open/short circuited
Discharge temperature sensor open/
short circuited
Indoor and outdoor communication error
DC bus under-voltage protection
DC bus over-voltage protection
Compressor phase current sensing
circuit error
Compressor demagnetization protection
PFC protection
IPM Temperature Protection
Over-power protection
System charge shortage or blockage
protection
Capacitor charging error
High pressure protection
Low pressure protection
Compressor stalling
Over-speeding
Drive board temperature sensor error
AC contactor protection
Temperature drift protection
Sensor connection protection
DC bus voltage drop error
Outdoor fan 1 error protection
Outdoor fan 2 error protection
Table 5.1 Meaning of Each Error
Error
Code
F1 Drive board communication error
F2 Compressor overheating protection
b5 Indoor and outdoor units unmatched
Communication line misconnected or
b7
expansion valve error
P7
F3 Pump-down
F4 Jumper error
F5 Forced defrosting
E6 Compressor startup failure
PL High discharge temperature protection
PH Overload protection
U1 Whole unit over-current protection
HE Over phase current protection
Hc Compressor desynchronizing
P8 IPM Current protection
Compressor phase loss/reversal
L9
protection
Frequency restricted/reduced with whole
F0
unit current protection
Frequency restricted/reduced with IPM
PU
current protection
Frequency restricted/reduced with high
E1
discharge temperature
Frequency restricted/reduced with anti-
E3
freezing protection
Frequency restricted/reduced with
LE
overload protection
Frequency restricted/reduced with IPM
LF
temperature protection
PF Indoor unit full water error
P9 Anti-freezing protection
PE AC input voltage abnormal
Pd Whole unit current sensing circuit error
U3 4-way valve reversing error
L3 Motor stalling
LA PG motor zero-crossing protection

Error
Error
Code
P6
H3
LP
dn
E7
Fo
C5
H1
Lc
E4
E8
E5
P5
H7
H5
Ld
F8
En
F9
FH
F6
EU
E9
E2
PP
U5
U7
H6
U8