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12 Troubleshooting
Installer reference guide
82
ERLQ004~008CA + 26CB6W
Daikin Altherma – Low temperature split
4P449978-1B – 2018.07
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.
12.3.10 Symptom: There is NO water flow from
the hot taps
Possible causes
Corrective action
The main water supply is off.
The pressure reducing valve (of
the domestic hot water tank kit) is
not fitted properly.
The strainer of the pressure
reducing valve (of the domestic
hot water tank kit) is blocked.
Turn off the water supply,
remove the strainer, and clean it.
The pressure reducing valve (of
the domestic hot water tank kit) is
not fitted properly.
Check and refit as required.
12.3.11 Symptom: The water from the hot taps is
cold
Possible causes
Corrective action
The thermal cut-out(s) has/have
operated.
Check and reset the button(s).
The indoor unit is NOT operating. Check unit operation. If any
faults are suspected, contact
your dealer.
12.3.12 Symptom: The water discharge is
intermittent
Possible causes
Corrective action
Thermal control failure (water will
be hot).
Turn off the power to the unit.
When discharge has stopped,
check the thermal controls and
replace if faulty. Contact your
dealer.
The expansion vessel is broken.
Replace the expansion vessel.
12.3.13 Symptom: The water flow from the taps
does NOT stop
Possible causes
Corrective action
Cold water inlet pressure
Check the pressure reducing
valve (of the domestic hot water
tank kit). Replace it if the
measured pressure is <2.1 bar.
Pressure relief valve (of the
domestic hot water tank kit)
Check and reset the button.
The pressure relief valve (of the
domestic hot water tank kit) is not
functioning properly.
Check for correct operation of the
pressure relief valve by turning
the red knob on the valve
counterclockwise.
▪ If you do NOT hear a clacking
sound, contact your dealer.
▪ In case water keeps running
out of the unit, first close both
the water inlet and outlet
shut‑off valves, then contact
your dealer.
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
measures before resetting an 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.
12.4.1
Error codes: Overview
Error codes of the outdoor unit
Error code
Detailed error
code
Description
A5
00
OU: High pressure cooling/Peak
cut/ freeze protection problem.
Please contact your dealer.
E1
00
OU: PCB defect.
Power reset required.
Please contact your dealer.
E3
00
OU: Actuation of high pressure
switch (HPS).
Please contact your dealer.