Installation manual
28
RKHBH/X008AA
Indoor unit for air to water heat pump system
4PW50203-1A
AA
Booster heater thermal protector
is open (applies only to
installations with a domestic hot
water tank)
Reset the thermal protector
Backup heater thermal protector
is open
Reset the thermal protector by
pressing the reset button (refer
to "Main components" on page 6
for location of the reset button)
Check the reset button of the
thermal protector.
If both the thermal protector and
the controller are reset, but the
AA
error code persists, the
backup heater thermal fuse has
blown.
Contact your local dealer.
C0
Flow switch failure (flow switch
remains closed while pump is
stopped)
Check that the flow switch is not
clogged with dirt.
C4
Heat exchanger thermistor
failure (heat exchanger
temperature sensor broken)
Contact your local dealer.
E1
Outdoor unit PCB defective
Contact your local dealer.
E3
Abnormal high pressure
Check that the unit is operating
within its operating range (refer
to "Technical specifications" on
page 29).
Contact your local dealer.
E4
Actuation of low pressure sensor
Check that the unit is operating
within its operating range (refer
to "Technical specifications" on
page 29).
Contact your local dealer.
E5
Overload activation of
compressor
Check that the unit is operating
within its operating range (refer
to "Technical specifications" on
page 29).
Contact your local dealer.
E7
Fan lock failure (fan is locked)
Check if the fan is not obstructed
by dirt. If the fan is not
obstructed, contact your local
dealer.
E9
Malfunction of electronic
expansion valve
Contact your local dealer.
EC
Domestic hot water temperature
too high (>89°C)
• Check that the contactor of the
electric booster heater is not
short circuited.
• Check that the domestic hot
water thermistor is giving the
correct read out.
F3
Too high discharge temperature
(e.g. due to outdoor coil
blockage)
Clean the outdoor coil. If the coil
is clean, contact your local
dealer.
H9
Outdoor temperature thermistor
failure (outdoor thermistor is
broken)
Contact your local dealer.
HC
Domestic hot water tank
thermistor failure
Contact your local dealer.
J1
Malfunction of pressure sensor
Contact your local dealer.
J3
Discharge pipe thermistor failure
Contact your local dealer.
J5
Suction pipe outdoor unit
thermistor failure
Contact your local dealer.
J6
Aircoil thermistor frost detection
failure
Contact your local dealer.
J7
Aircoil thermistor mean
temperature failure
Contact your local dealer.
J8
Liquid pipe outdoor unit
thermistor failure
Contact your local dealer.
L4
Electric component failure
Contact your local dealer.
L5
Electric component failure
Contact your local dealer.
L8
Electric component failure
Contact your local dealer.
L9
Electric component failure
Contact your local dealer.
LC
Electric component failure
Contact your local dealer.
P1
PCB failure
Contact your local dealer.
P4
Electric component failure
Contact your local dealer.
PJ
Failure of capacity setting
Contact your local dealer.
Error
code
Failure cause
Corrective action
U0
Refrigerant failure (due to
refrigerant leak)
Contact your local dealer.
U2
Main circuit voltage failure
Contact your local dealer.
U4
Communication failure
Contact your local dealer.
U5
Communication failure
Contact your local dealer.
U7
Communication failure
Contact your local dealer.
UA
Communication failure
Contact your local dealer.
Error
code
Failure cause
Corrective action
1D_IM_4PW50203-1A.book Page 28 Thursday, January 29, 2009 10:51 AM
