12 Troubleshooting
Installer reference guide
63
EGSQH10S18AA9W
Daikin Altherma ground source heat pump
4P351748-1D – 2016.02
Possible causes
Corrective action
The water circuit head is too high The water circuit head is the
difference in height between the
unit and the highest point of the
water circuit. If the 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 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 or brine keeps
running out of the unit, close
both 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
The 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
OR
▪ [A.8] > Installer settings >
Overview settings [4‑00]
▪ The thermal protector of the
backup heater has not been
activated. If it has, check:
▪ The space heating and brine
circuit pressure
▪ Whether there is air in the
system
▪ The air purge operation
Press the reset button in the
switch box. See
"14.3 Components" on page 69
for the location of the reset
button.
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]
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.
Large domestic hot water tapping
happened recently before the
programmed start-up of the
disinfection function
When the Domestic hot water >
Type > Reheat or
sched. is selected, it is
recommended to program the
start-up the disinfection function
at least 4 hours later than the last
expected large hot water tapping.
This start-up can be set by
installer settings (disinfection
function).
When the Domestic hot water >
Type > Scheduled only is
selected, it is recommended to
program a Storage eco 3 hours
before the scheduled start-up of
the disinfection function to
preheat the tank.
The disinfection operation was
stopped manually: with the user
interface displaying the DHW
home page and its user
permission level set to Installer,
the
button was pressed
during disinfection operation.
Do NOT press the
button
while the disinfection function is
active.
12.4
Solving problems based on error
codes
When a problem happens, an error code appears on the user
interface. It is important to understand the problem and to take
countermeasure before resetting the error code. This should be
done by a licensed installer or by your local dealer.
This chapter gives you an overview of all error codes and the
content of the error code as it appears on the user interface.
For a more detailed troubleshooting guideline for each error, please
see the service manual.
