RKHBH/X016AB
Indoor unit for air to water heat pump system
4PW50205-1A
Installation manual
27
Symptom 7: Space heating capacity shortage at low outdoor
temperatures
Error codes
When a safety device is activated, the user interface LED will be
flashing, and an error code will be displayed.
A list of all errors and corrective actions can be found in the table
below.
Reset the safety by turning the unit OFF and back ON.
In case this procedure for resetting the safety is not successful,
contact your local dealer.
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
Backup heater operation is not
activated.
Check that the "backup heater
operation status" field setting [4-00]
is turned on, see "Field settings" on
page 18.
Check whether or not the thermal
protector of the backup heater has
been activated (refer to Main
components, "Backup heater
thermal protector" on page 6 for
location of the reset button).
Check if booster heater and backup
heater are configured to operate
simultaneously (field setting [4-01],
see "Field settings" on page 18)
Check whether or not the thermal
fuse of the backup heater is blown
(refer to "Main components",
"Backup heater thermal fuse" on
page 6 for location of the reset
button).
The backup heater equilibrium
temperature has not been
configured correctly.
Raise the 'equilibrium temperature'
field setting [5-01] to activate backup
heater operation at a higher outdoor
temperature.
Too much heat pump capacity is
used for heating domestic hot water
(applies only to installations with a
domestic hot water tank).
Check that the 'space heating priority
temperature' field settings are
configured appropriately:
• Make sure that the 'space heating
priority status' field setting [5-02] is
enabled.
• Raise the 'space heating priority
temperature' field setting [5-03] to
activate booster heater operation at a
higher outdoor temperature.
Instruction to turn the unit OFF
User interface mode
(heating/cooling
=
)
Domestic water
heating mode (
w
)
Push the
y
button
Push the
v
button
ON
ON
1 time
1 time
ON
OFF
1 time
—
OFF
ON
—
1 time
OFF
OFF
—
—
Error
code
Failure cause
Corrective action
80
Inlet water temperature
thermistor failure (inlet water
thermistor broken)
Contact your local dealer.
81
Outlet water temperature
thermistor failure (outlet water
temperature sensor broken)
Contact your local dealer.
89
Water heat exchanger freeze-up
failure (due to water flow too low)
Refer to error code
7H
.
Water heat exchanger freeze-up
failure (due to refrigerant
shortage)
Contact your local dealer.
7H
Flow failure (water flow too low
or no water flow at all, minimum
required water flow is 16 l/min)
• 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 29
).
• Also refer to "Charging water" on
page 11.
• 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 >0.3 bar (water is cold),
>>0.3 bar (water is hot).
• 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 17).
• 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 pump fuse (FU2)
and PCB fuse (FU1) are not
blown.
8H
Outlet water temperature of
indoor unit too high (>65°C)
• 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.
A1
Indoor unit PCB defective
Contact your local dealer.
A5
Too low (during cooling
operation) or too high (during
heating operation) refrigerant
temperature (measured by R3T)
Contact your local dealer.
1D_IM_4PW50205-1A.book Page 27 Thursday, January 29, 2009 12:00 PM
