Rotex RKHBH008BA Installation Manual page 82

Error
code Failure cause
80
Inlet water temperature
thermistor failure (inlet water
thermistor broken)
81
Outlet water temperature
thermistor failure (outlet water
temperature sensor broken)
89
Water heat exchanger freeze-up
failure (due to water flow too low)
Water heat exchanger freeze-up
failure (due to refrigerant
shortage)
7H
Flow failure (water flow too low
or no water flow at all, minimum
required water flow is 12 l/min)
8H
Outlet water temperature of
indoor unit too high (>65°C)
A1
Indoor unit PCB defective
A5
Too low (during cooling
operation) or too high (during
heating operation) refrigerant
temperature (measured by R3T)
AA
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.
AC
Booster heater thermal protector
is open (applies only to
installations with a domestic hot
water tank)
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
Installation manual
37
Corrective action
Contact your local dealer.
Contact your local dealer.
Refer to error code 7H.
Contact your local dealer.
• Check that all shut off valves of
the water circuit are completely
open.
• Check if the water filter needs
cleaning.
• Check that the unit is operating
within its operating range (refer
to "Technical specifications" on
page 38).
• Also refer to "Charging water" on
page 16.
• Make sure there is no air in the
system (purge air).
• Check on the manometer that
there is sufficient water
pressure. The water pressure
must be >1 bar (water is cold).
• Check that the pump speed
setting is on the highest speed.
• Make sure that the expansion
vessel is not broken.
• Check that the resistance in the
water circuit is not too high for
the pump (refer to "Setting the
pump speed" on page 23).
• If this error occurs at defrost
operation (during space heating
or domestic water heating),
make sure that the backup
heater power supply is wired
correctly and that fuses are not
blown.
• Check that the contactor of the
electric backup heater is not
short circuited.
• Check that the outlet water
thermistor is giving the correct
read out.
Contact your local dealer.
Contact your local dealer.
Reset the thermal protector by
pressing the reset button (refer
to "Main components" on
page 10 for location of the reset
button)
Contact your local dealer.
Reset the thermal protector
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 38).
Contact your local dealer.
Error
code Failure cause
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
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
Check that the unit is operating
within its operating range (refer
to "Technical specifications" on
page 38).
Contact your local dealer.
Check that the unit is operating
within its operating range (refer
to "Technical specifications" on
page 38).
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.
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/X008BA
4PW54224-1A