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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.
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
pressing 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).
Installation manual
47
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
16).
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 " when
n
n
C
ORRECTIVE ACTION
Change the "user permission level"
field setting [0-00], see
"8.9. Field
settings" on page
26.
C
ORRECTIVE ACTION
Check that the "backup heater
operation status" field setting [4-00]
is turned on, see
"8.9. Field settings"
on page
26.
Check whether or not the thermal
protector of the backup heater has
been activated (refer to
Main
components,
"18. Backup heater
thermal protector" on page 11
for
location of the reset button).
Check if booster heater and backup
heater are configured to operate
simultaneously (field setting [4-01],
see
"8.9. Field settings" on page
26).
Check whether or not the thermal
fuse of the backup heater is blown
(refer to
"Main
components",
"19. Backup heater thermal fuse" on
page 11
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.
Symptom 8: [4-03] and maximum tank set point is not according
to the applicable tank
1.
In case of domstic hot water tank with built-in electrical booster
heater (EKHW*) and [4-03]=5 or maximum domestic hot water
set point is 60°C, the wrong field setting and logic is activated
according to the applicable tank.
2.
In case of domestic hot water tank without booster heater
(EKHTS) and [4-03]≠5 or maximum domestic hot water set point
is 78°C, the wrong field setting and logic is activated according
to the applicable tank.
P
OSSIBLE CAUSES
At the time of setting DIP switch
SS2-2, wrong field wiring caused
wrong detection of tank type.
Symptom 9: Temperature values displayed on the remote
controller (user interface) are displayed in °F instead of °C
P
OSSIBLE CAUSES
You accidentally changed the setting
to view the temperature values in °F
by pushing the ib and jb
buttons simultaneously.
'
C
ORRECTIVE ACTION
Check all field wiring between indoor
unit and tank switch box.
Reset procedure
• Power off the indoor unit and put
SS-2 to OFF.
• Power on the indoor unit, it means
that the indoor unit will detect no
domestic hot water tank.
• Power off the indoor unit and put
SS2-2 to ON again.
• Power on the indoor unit and the
the indoor unit will detect again the
type of tank: tank with built-in
electrical booster heater
(EKHW*)([4-03] default value will
be 3), or tank without electrical
booster heater (EKHTS)([4-03]
default value will be 5).
C
ORRECTIVE ACTIONS
To change the display back to °C,
push ib and jb buttons
simultaneously for 5 seconds.
Execute same procedure to change
back to the °F display. The default
temperature display is in °C.
EKHBH/X016BB
Indoor unit for air to water heat pump system
4PW62572-1A – 01.2011
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