Symptom: Space Heating (Cooling) Capacity Shortage - Daikin EBLA04E V Series Service Manual

3 | Troubleshooting

3.4.11 Symptom: Space heating (cooling) capacity shortage

Possible failure
Space heating: too low
leaving water temperature
setpoint.
Space cooling: too high
leaving water temperature
setpoint.
Too low (space heating) or
too high (space cooling)
setpoint on room
thermostat.
Space heating (cooling)
NOT activated.
Possible failure
External room thermostat
used with setting [C‑07] on
value 2 (= RT control).
Backup heater operation
disabled (setting [4‑00] is
set to 0 or 2).
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.
Service manual
92
draft – 31/05/2022 15:53
Root cause category: end user
Root cause
User set too low (space
heating) or too high (space
cooling) leaving water
temperature setpoint by
schedule or manual
operation.
User set too low (space
heating) or too high (space
cooling) room setpoint by
schedule or manual
operation.
Root cause category: parameter (setting)
Root cause
Wrong setting of [C‑07] -
unit control method.
Setting backup heater
operation mode [4‑00] is
set 0 (backup heater
disabled) or 2 (ONLY
domestic hot water).
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.
Root cause category: installation
Root cause
3‑way valve incorrectly
mounted.
Check
Check leaving water
setpoint.
Check room thermostat
setpoint.
Check if space heating
(cooling) is activated.
Check
Check setting [C‑07].
Check setting [4‑00].
Check setting [6‑0D].
Check
Check the 3‑way valve.
Repair
Adapt leaving water
setpoint.
(Remark: check the
weather dependent
settings (relation outdoor
temperature - setpoint) in
case weather dependent
control is activated.)
Adapt room thermostat
setpoint.
(Remark: check the
weather dependent
settings (relation outdoor
temperature - setpoint) in
case weather dependent
control is activated.)
Repair
Adjust setting to match
application - see installer
reference guide.
Change setting [4‑00] to 1.
It is advisable to set to
factory setting (reheat +
schedule) and program the
schedule to heat the
domestic hot water during
periods of no space
heating required.
Repair
Correct the position of the
3‑way valve.
EBLA04~08E + EDLA04~08E
Daikin Altherma 3 M
ESIE22-09 – 2022.05