Daikin EK2CB07CAV3, Installer'S Reference Manual

Page: 82 / 122

12 Troubleshooting
Installer reference guide
82
EKCB
EK2CB EKMBU EKMBUHCA9W1
Daikin Altherma low temperature monobloc
4P405544-1 – 2015.03
12.3.4 Symptom: The pressure relief valve opens
Possible causes Corrective action
The expansion vessel is broken Replace the expansion vessel.
The water volume in the
installation is too high Make sure that the water volume
in the installation is below the
maximum allowed value (see
"6.3.3 To check the water volume
and flow rate" on page 27
and
"6.3.4 Changing the pre-pressure
of the expansion vessel" on
page 28
).
The water circuit head is too high The water circuit head is the
difference in height between the
outdoor unit and the highest
point of the water circuit. If the
outdoor unit is located at the
highest point of the installation,
the installation height is
considered 0 m. The maximum
water circuit head is 10 m.
Check the installation
requirements.
12.3.5 Symptom: The water pressure relief valve
leaks
Possible causes Corrective action
Dirt is blocking the water
pressure relief valve outlet Check whether the pressure
relief valve works correctly by
turning the red knob on the valve
counterclockwise:
▪ If you do NOT hear a clacking
sound, contact your dealer.
▪ If the water keeps running out
of the unit, close both the
water inlet and outlet shut-off
valves first and then contact
your dealer.
12.3.6 Symptom: The space is NOT sufficiently
heated at low outdoor temperatures
Possible causes Corrective action
If the system contains a backup
heater: backup heater operation
is not activated Check and make sure that:
▪ The backup heater operation
mode is enabled. Go to:
▪ [A.5.1.1] > Installer settings
> Heat sources > Backup
heater > Operation mode
[4‑00]
▪ The thermal protector of the
backup heater has not been
activated. If it has, check:
▪ The water pressure
▪ Whether there is air in the
system
▪ The air purge operation
Press the reset button in the
switch box. See
"14.4 Components" on page 92
for the location of the reset
button.
Possible causes Corrective action
If the system contains a backup
heater: the backup heater
equilibrium temperature has not
been configured correctly Increase the "equilibrium
temperature" to activate the
backup heater operation at a
higher outdoor temperature. Go
to:
▪ [A.5.1.4] > Installer settings >
Heat sources > Backup heater
> Equilibrium temp. OR
▪ [A.8] > Installer settings >
Overview settings [5‑01]
If the system contains a backup
heater: the overcurrent fuse has
operated Check the fuse and switch it back
on
If the system contains a backup
heater: the thermal protector has
operated Check the thermal protector and
reset it by pushing the button
There is air in the system Purge air manually (see "To
perform a manual air purge" on
page 76
) or use the automatic air
purge function (see "To perform
an automatic air purge" on
page 76
).
Too much heat pump capacity is
used for heating domestic hot
water (applies only to
installations with a domestic hot
water tank) Check and make sure that the
“space heating priority” settings
have been configured
appropriately:
▪ Make sure that the "space
heating priority status" has
been enabled. Go to [A.8] >
Installer settings > Overview
settings [5‑02]
▪ Increase the "space heating
priority temperature" to
activate backup heater
operation at a higher outdoor
temperature. Go to [A.8] >
Installer settings > Overview
settings [5‑03]
12.3.7 Symptom: The pressure at the tapping
point is temporarily unusual high
Possible causes Corrective action
Failing or blocked pressure relief
valve. ▪ Flush and clean the complete
tank including the piping
between pressure relief valve
and the cold water inlet.
▪ Replace the pressure relief
valve.
12.3.8 Symptom: Decoration panels are pushed
away due to a swollen tank
Possible causes Corrective action
Failing or blocked pressure relief
valve. Contact your local dealer.
12.3.9 Symptom: Tank disinfection function is
NOT completed correctly (AH-error)
Possible causes Corrective action
The disinfection function was
interrupted by domestic hot water
tapping Program the start-up of the
disinfection function when the
coming 4 hours NO domestic hot
water tapping is expected.