Symptom: Domestic Hot Water Capacity Shortage - Daikin altherma 3 M Service Manual

2.4.9 Symptom: Domestic hot water capacity shortage

Possible failure
Too low domestic hot
water setpoint.
Domestic hot water NOT
activated.
Possible failure
Setting domestic hot water
operation mode [6‑0D]
NOT set optimally.
Possible failure
3‑way valve does NOT
switch correctly between
space heating (cooling)
connection and domestic
hot water connection.
Possible failure
3‑way valve blocked.
Deviation of domestic hot
water tank thermistor.
EBLA09~16DA + EDLA09~16DA
Daikin Altherma 3 M
ESIE20-06A – 2021.03
Root cause category: end user
Root cause
User set too low domestic
hot water setpoint by
schedule or manual
operation.
—
Root cause category: parameter (setting)
Root cause
Setting domestic hot water
operation mode [6‑0D] is
set to 2 (scheduled ONLY).
Root cause category: installation
Root cause
3‑way valve incorrectly
mounted.
Root cause category: component – electrical
Root cause
Component failure.
Domestic hot water tank
thermistor measures a
higher temperature than
actual (component failure).
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.
2 Troubleshooting
|
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.
Service manual
75