Rotex RKHBH008AA Manuel D'installation page 60

Error
code Failure cause
Booster heater thermal protector
AA
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.
Flow switch failure (flow switch
C0
remains closed while pump is
stopped)
Heat exchanger thermistor
C4
failure (heat exchanger
temperature sensor broken)
Outdoor unit PCB defective
E1
Abnormal high pressure
E3
Actuation of low pressure sensor
E4
Overload activation of
E5
compressor
Fan lock failure (fan is locked)
E7
Malfunction of electronic
E9
expansion valve
Domestic hot water temperature
EC
too high (>89°C)
Too high discharge temperature
F3
(e.g. due to outdoor coil
blockage)
Outdoor temperature thermistor
H9
failure (outdoor thermistor is
broken)
Domestic hot water tank
HC
thermistor failure
Malfunction of pressure sensor
J1
Discharge pipe thermistor failure
J3
Suction pipe outdoor unit
J5
thermistor failure
Aircoil thermistor frost detection
J6
failure
Aircoil thermistor mean
J7
temperature failure
Liquid pipe outdoor unit
J8
thermistor failure
Electric component failure
L4
Electric component failure
L5
Electric component failure
L8
Electric component failure
L9
Electric component failure
LC
PCB failure
P1
Electric component failure
P4
Failure of capacity setting
PJ
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.
Error
code Failure cause
Refrigerant failure (due to
U0
refrigerant leak)
Main circuit voltage failure
U2
Communication failure
U4
Communication failure
U5
Communication failure
U7
Communication failure
UA
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/X008AA
4PW50203-1A