2
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Troubleshooting
Service manual
79
EBLA09~16DA + EDLA09~16DA
Daikin Altherma 3 M
ESIE20-06A – 2021.03
2.4.11 Symptom: Space heating capacity shortage
Root cause category: end user
Possible failure
Root cause
Check
Repair
Too low leaving water
temperature setpoint.
User set too low leaving
water temperature
setpoint by schedule or
manual operation.
Check leaving water
setpoint.
Adapt leaving water
setpoint.
(Remark: check the
weather dependent
settings (relation outdoor
temperature - setpoint) in
case weather dependent
control is activated.)
Too low space heating
setpoint on room
thermostat.
User set too low room
setpoint by schedule or
manual operation.
Check room thermostat
setpoint.
Adapt room thermostat
setpoint.
(Remark: check the
weather dependent
settings (relation outdoor
temperature - setpoint) in
case weather dependent
control is activated.)
Space heating NOT
activated.
Check if space heating is
activated.
Root cause category: parameter (setting)
Possible failure
Root cause
Check
Repair
External room thermostat
used with setting [C‑07] on
value 2 (= RT control).
Wrong setting of [C‑07] -
unit control method.
Check setting [C‑07].
Adjust setting to match
application - see installer
reference guide.
Backup heater operation
disabled (setting [4‑00] is
set to 0).
Setting backup heater
operation mode [4‑00] is
set to 2 (ONLY domestic
hot water).
Check setting [4‑00].
Change setting [4‑00] to 1.
Setting domestic hot water
operation mode [6‑0D]
NOT set optimally.
Setting domestic hot water
operation mode [6‑0D] is
set to 0 (reheat ONLY). This
will cause the system to
work too frequently in
domestic hot water
operation and less in space
heating.
Check setting [6‑0D].
It is advisable to set to
factory setting (
schedule) and program the
schedule to heat the
domestic hot water during
periods of no space
heating required.
Root cause category: installation
Possible failure
Root cause
Check
Repair
3‑way valve does NOT
switch correctly between
space heating (cooling)
connection and domestic
hot water connection.
3‑way valve incorrectly
mounted.
Check the 3‑way valve.
Correct the position of the
3‑way valve.
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