Rotex RKHBH016AB Manuel D'installation page 60

Error
code Failure cause
AA
Booster heater thermal protector
is open (applies only to
installations with a domestic hot
water tank)
Backup heater thermal protector
is open
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.
C0
Flow switch failure (flow switch
remains closed while pump is
stopped)
C4
Heat exchanger thermistor
failure (heat exchanger
temperature sensor broken)
E1
Outdoor unit PCB defective
E3
Abnormal high pressure
E4
Actuation of low pressure sensor
E5
Overload activation of
compressor
E7
Fan lock failure (fan is locked)
E9
Malfunction of electronic
expansion valve
EC
Domestic hot water temperature
too high (>89°C)
F3
Too high discharge temperature
(e.g. due to outdoor coil
blockage)
H3
Malfunctioning HPS system
H9
Outdoor temperature thermistor
failure (outdoor thermistor is
broken)
HC
Domestic hot water tank
thermistor failure
J1
Malfunction of pressure sensor
J3
Discharge pipe thermistor failure
J5
Suction pipe outdoor unit
thermistor failure
J6
Aircoil thermistor frost detection
failure
J7
Aircoil thermistor mean
temperature failure
J8
Liquid pipe outdoor unit
thermistor failure
L4
Electric component failure
L5
Electric component failure
L8
Electric component failure
L9
Electric component failure
LC
Electric component failure
P1
PCB failure
P4
Electric component failure
PJ
Failure of capacity setting
Installation manual
28
Corrective action
Reset the thermal protector
Reset the thermal protector by
pressing the reset button (refer
to "Main components" on page 6
for location of the reset button)
Contact your local dealer.
Check that the flow switch is not
clogged with dirt.
Contact your local dealer.
Contact your local dealer.
Check that the unit is operating
within its operating range (refer
to "Technical specifications" on
page 29).
Contact your local dealer.
Check that the unit is operating
within its operating range (refer
to "Technical specifications" on
page 29).
Contact your local dealer.
Check that the unit is operating
within its operating range (refer
to "Technical specifications" on
page 29).
Contact your local dealer.
Check if the fan is not obstructed
by dirt. If the fan is not
obstructed, contact your local
dealer.
Contact your local dealer.
• 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.
Clean the outdoor coil. If the coil
is clean, contact your local
dealer.
Contact your local dealer.
Contact your local dealer.
Contact your local dealer.
Contact your local dealer.
Contact your local dealer.
Contact your local dealer.
Contact your local dealer.
Contact your local dealer.
Contact your local dealer.
Contact your local dealer.
Contact your local dealer.
Contact your local dealer.
Contact your local dealer.
Contact your local dealer.
Contact your local dealer.
Contact your local dealer.
Contact your local dealer.
Error
code Failure cause
U0
Refrigerant failure (due to
refrigerant leak)
U2
Main circuit voltage failure
U4
Communication failure
U5
Communication failure
U7
Communication failure
UA
Communication failure
Indoor unit for air to water heat pump system
Corrective action
Contact your local dealer.
Contact your local dealer.
Contact your local dealer.
Contact your local dealer.
Contact your local dealer.
Contact your local dealer.
RKHBH/X016AB
4PW50205-1A