General Symptoms; Error Codes - Rotex RKHBH008BA Installation Manual

General symptoms

Symptom 1: The unit is turned on (y LED is lit) but the unit is not
heating or cooling as expected
P
OSSIBLE CAUSES
The temperature setting is not
correct.
The water flow is too low.
The water volume in the installation
is too low.
Symptom 2: The unit is turned on but the compressor is not starting
(space heating or domestic water heating)
P
OSSIBLE CAUSES
The unit must start up out of its
operation range (the water
temperature is too low).
The benefit kWh rate power supply
settings and electrical connections
do not match.
The benefit kWh rate signal was sent
by the electricity company.
Symptom 3: Pump is making noise (cavitation)
P
OSSIBLE CAUSES
There is air in the system.
Water pressure at pump inlet is too
low.
Symptom 4: The water pressure relief valve opens
P
OSSIBLE CAUSES
The expansion vessel is broken.
The water volume in the installation
is too high.
RKHBH/X008BA
Indoor unit for air to water heat pump system
4PW54224-1A
C
ORRECTIVE ACTION
Check the controller set point.
• Check that all shut off valves of the
water circuit are completely open.
• Check if the water filter needs
cleaning.
• 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).
Make sure that the water volume in
the installation is above the minimum
required value (refer to "Checking
the water volume and expansion
vessel pre-pressure" on page 14).
C
ORRECTIVE ACTION
In case of low water temperature, the
system utilizes the backup heater to
reach the minimum water
temperature first (15°C).
• Check that the backup heater power
supply is correct.
• Check that the backup heater
thermal fuse is closed.
• Check that the backup heater
thermal protector is not activated.
• Check that the backup heater
contactors are not broken.
If [D-01]=1 or 2, the wiring requires
specific installation like illustrated in
"Connection to a benefit kWh rate
power supply" on page 19. Other
correctly installed configurations are
possible, but are to be specific for
the type of benefit kWh rate power
supply type at this specific site.
Wait for the power to return.
C
ORRECTIVE ACTION
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 manometer is not
broken.
• Check that the expansion vessel is
not broken.
• Check that the setting of the pre-
pressure of the expansion vessel is
correct (refer to "Setting the pre-
pressure of the expansion vessel" on
page 15).
C
ORRECTIVE ACTION
Replace the expansion vessel.
Make sure that the water volume in
the installation is under the
maximum allowed value (refer to
"Checking the water volume and
expansion vessel pre-pressure" on
page 14).
Symptom 5: The water pressure relief valve leaks
P
OSSIBLE CAUSES
Dirt is blocking the water pressure
relief valve outlet.
Symptom 6: The user interface displays "n
certain buttons
P
OSSIBLE CAUSES
The current permission level is set to
a level that prevents using the
pressed button.
Symptom 7: Space heating capacity shortage at low outdoor
temperatures
P
OSSIBLE CAUSES
Backup heater operation is not
activated.
The backup heater equilibrium
temperature has not been
configured correctly.
Too much heat pump capacity is
used for heating domestic hot water
(applies only to installations with a
domestic hot water tank).

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.
Instruction to turn the unit OFF
User interface mode Domestic water
(heating/cooling =)
heating mode (w)
ON ON
ON OFF
OFF ON
OFF OFF
In case this procedure for resetting the safety is not successful,
contact your local dealer.
C
ORRECTIVE ACTION
Check for correct operation of the
pressure relief valve by turning the
red knob on the valve counter
clockwise:
• If you do not hear a clacking sound,
contact your local dealer.
• In case the water keeps running out
of the unit, close both the water inlet
and outlet shut-off valves first and
then contact your local dealer.
n n " when pressing
n
C
ORRECTIVE ACTION
Change the "user permission level"
field setting [0-00], see "Field
settings" on page 23.
C
ORRECTIVE ACTION
Check that the "backup heater
operation status" field setting [4-00]
is turned on, see "Field settings" on
page 23.
Check whether or not the thermal
protector of the backup heater has
been activated (refer to Main
components, "Backup heater
thermal protector" on page 10 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 23)
Check whether or not the thermal
fuse of the backup heater is blown
(refer to "Main components",
"Backup heater thermal fuse" on
page 10 for location of the reset
button).
Raise the equilibrium temperature
' '
field setting [5-01] to activate backup
heater operation at a higher outdoor
temperature.
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.
Push the y
Push the
v button
button
1 time 1 time
1 time —
— 1 time
— —
Installation manual
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