Domestic Hot Water Capacity Shortage; General Capacity Shortage - Daikin Altherma EBLQ011CAV3 Service Manual

1 Troubleshooting
Possible failure
Partial ice up of coil.
1.5.9

Domestic hot water capacity shortage

Root cause category: end user
Possible failure
Too low domestic hot water
setpoint.
Domestic hot water NOT activated. —
Root cause category: parameter (setting)
Possible failure
Setting domestic hot water
operation mode [6‑0D] NOT set
optimally.
Root cause category: installation
Possible failure
3‑way valve does NOT switch
correctly between space heating
connection and domestic hot water
connection.
Root cause category: component – electrical
Possible failure
3‑way valve blocked.
Deviation of domestic hot water
tank thermistor.
1.5.10

General capacity shortage

Root cause category: software control
Possible failure
Compressor frequency limited -
high discharge temperature
protection function active.
Service manual
28
Root cause
Partial refrigerant blockage.
Dirty coil.
Bad weather conditions.
Root cause
User set too low domestic hot
water setpoint by schedule or
manual operation.
Root cause
Setting domestic hot water
operation mode [6‑0D] is set to 2
(scheduled ONLY).
Root cause
3‑way valve incorrectly mounted.
Root cause
Component failure.
Domestic hot water tank thermistor
measures a higher temperature
than actual (component failure).
Root cause
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.
Check
Check refrigerant circuit.
Check if coil is dirty.
Unit is NOT powerful enough to
defrost due to too strong wind,
snow, ...
Check
Check domestic hot water tank set
temperature in combination with
boiler volume and hot water usage.
Check if domestic hot water
heating is activated.
Check
Check setting [6‑0D].
Check
Check the 3‑way valve.
Check
Check the 3‑way valve.
Check domestic hot water tank
thermistor.
Check
Activation of the protection function
can be caused by various reasons,
therefore we recommend to check
the following:
▪ Check refrigerant charge,
▪ Check expansion valve
correct operation,
▪ Check suction thermistor,
▪ Check discharge pipe
thermistor.
EBLQ+EDLQ011~016CAV3+W1 + EBLQ+EDLQ011~016CA3V3+W1
Repair
Replace part where blockage
occurs.
Clean coil.
Outdoor unit installation MUST be
protected from weather (wind,
snow, ...).
See installer reference guide for
correct installation.
Repair
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.)
—
Repair
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.
Repair
Correct the position of the 3‑way
valve.
Repair
Replace the 3‑way valve.
Replace domestic hot water tank
thermistor.
Repair
Based on the diagnosis execute
one of the following actions:
▪ Correct the refrigerant charge,
▪ Replace expansion valve,
▪ Replace suction thermistor,
for
▪ Replace discharge
thermistor.
+ EK(2)CB07CAV3 + EKMBUHCA3V3+9W1
Daikin Altherma – Monobloc
ESIE18-04 – 2019.02
pipe