1 Troubleshooting
Service manual
28
EBLQ+EDLQ011~W1 + EBLQ+EDLQ011~0W1
+ EK(2)CB EKMB9W1
Daikin Altherma – Monobloc
ESIE18-04 – 2019.02
Possible failure
Root cause
Check
Repair
Partial ice up of coil.
Partial refrigerant blockage.
Check refrigerant circuit.
Replace part where blockage
occurs.
Dirty coil.
Check if coil is dirty.
Clean coil.
Bad weather conditions.
Unit is NOT powerful enough to
defrost due to too strong wind,
snow, ...
Outdoor unit installation MUST be
protected from weather (wind,
snow, ...).
See installer reference guide for
correct installation.
1.5.9
Domestic hot water capacity shortage
Root cause category: end user
Possible failure
Root cause
Check
Repair
Too low domestic hot water
setpoint.
User set too low domestic hot
water setpoint by schedule or
manual operation.
Check domestic hot water tank set
temperature in combination with
boiler volume and hot water usage.
Adapt domestic hot water setpoint
(e.g. 50~55°C).
(Remark: check the weather
dependent settings (relation
outdoor temperature - setpoint) in
case weather dependent control is
activated.)
Domestic hot water NOT activated. —
Check if domestic hot water
heating is activated.
—
Root cause category: parameter (setting)
Possible failure
Root cause
Check
Repair
Setting domestic hot water
operation mode [6‑0D] NOT set
optimally.
Setting domestic hot water
operation mode [6‑0D] is set to 2
(scheduled ONLY).
Check setting [6‑0D].
In case schedule is ONLY used,
assure that the programmed
schedule is in line with the timings
hot water is required. Adapt the
schedules if necessary.
Root cause category: installation
Possible failure
Root cause
Check
Repair
3‑way valve does NOT switch
correctly between space heating
connection and domestic hot water
connection.
3‑way valve incorrectly mounted.
Check the 3‑way valve.
Correct the position of the 3‑way
valve.
Root cause category: component – electrical
Possible failure
Root cause
Check
Repair
3‑way valve blocked.
Component failure.
Check the 3‑way valve.
Replace the 3‑way valve.
Deviation of domestic hot water
tank thermistor.
Domestic hot water tank thermistor
measures a higher temperature
than actual (component failure).
Check domestic hot water tank
thermistor.
Replace domestic hot water tank
thermistor.
1.5.10
General capacity shortage
Root cause category: software control
Possible failure
Root cause
Check
Repair
Compressor frequency limited -
high discharge temperature
protection function active.
In case the discharge temperature
is higher than 105°C the
compressor frequency will be
reduced. When the discharge
temperature is lower than 105°C
the frequency can increase again.
Activation of the protection function
can be caused by various reasons,
therefore we recommend to check
the following:
▪ Check refrigerant charge,
▪ Check expansion valve for
correct operation,
▪ Check suction thermistor,
▪ Check
discharge
pipe
thermistor.
Based on the diagnosis execute
one of the following actions:
▪ Correct the refrigerant charge,
▪ Replace expansion valve,
▪ Replace suction thermistor,
▪ Replace
discharge
pipe
thermistor.
Содержание Altherma EBLQ011CAV3
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