1 Troubleshooting
Service manual
32
EBLQ+EDLQ011~W1 + EBLQ+EDLQ011~0W1
+ EK(2)CB EKMB9W1
Daikin Altherma – Monobloc
ESIE18-04 – 2019.02
Root cause category: component – electrical
Possible failure
Root cause
Check
Repair
Outlet water after backup heater
thermistor deviation causes
incorrect temperature control.
▪ Deviation of thermistor (lower
temperature
measured
than
actual),
▪ Bad contact between sensor
and pipe.
Check outlet water after backup
heater thermistor.
Replace outlet water after backup
heater thermistor or hydro PCB.
Deviation of domestic hot water
tank thermistor.
(Remark: ONLY valid for
inaccurate domestic hot water
temperature control.)
▪ Deviation of thermistor,
▪ Bad contact between sensor
and pipe.
Check domestic hot water tank
thermistor.
Replace domestic hot water tank
thermistor or hydro PCB.
User interface – thermostat sensor
has incorrect reading of room
temperature.
Deviation of user interface room
temperature sensor.
Compare temperature measured
by user interface with actual room
temperature.
In case of deviation the room
temperature offset can be adjusted
through setting [2‑0A].
1.5.13
Power consumption too high
Root cause category: end user
Possible failure
Root cause
Check
Repair
Too high domestic hot water
setpoint.
User set too high domestic hot
water setpoint by schedule or
manual operation.
Check domestic hot water tank set
temperature; avoid electric heater
use.
Adapt domestic hot water setpoint
(e.g. 50~55°C).
Too high leaving water
temperature setpoint.
User set too high leaving water
temperature setpoint by schedule
or manual operation.
Check leaving water setpoint.
Adapt leaving water setpoint (e.g.
<55°C will reduce backup heater
operation).
Too high space heating setpoint
on room thermostat.
User set too high room setpoint by
schedule or manual operation.
Check room thermostat setpoint.
Adapt room thermostat setpoint.
Root cause category: parameter (setting)
Possible failure
Root cause
Check
Repair
Too high leaving water
temperature (LWT) - weather
dependent.
Incorrect weather dependent
setting --> too high LWT limit set
[1‑00]~[1‑09].
Check leaving water temperature
(LWT) high limit in weather
dependent (setting [1‑03]).
Adapt high leaving water
temperature (LWT) limit for
weather dependent heating
(setting [1‑03]).
User interface thermostat used
with setting [C‑07] on value 1 (=
external thermostat control).
Wrong setting of [C‑07] - unit
control method.
Check setting [C‑07].
Adjust setting to match application
- see installer reference guide.
Pump keeps running all the time
during space heating operation.
Wrong setting of [F‑0D] - pump
operation.
Check pump operation mode
setting [F‑0D].
Change setting [F‑0D] from
continuous operation (value 0) to
Sample (1) or Request (2). See
installer reference guide for
applicable value.
Setting disinfection operation day
[2‑00] was set to 0 (each day).
Setting disinfection operation day
[2‑00] was set to 0 (each day).
Check setting [2‑00].
Adjust setting if necessary.
Unit is running in emergency
operation and is using backup
heater ONLY. [4‑06] is set to 1.
Unit is running in emergency
operation and is using backup
heater ONLY. [4‑06] is set to 1.
Check setting [4‑06].
Adjust setting if necessary.
Backup heater equilibrium point
was set too high.
Setting "equilibrium
temperature" [5‑01] was set too
high.
Check setting [5‑01].
Change setting [5‑01] to less
quickly allow backup heater
operation.
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] in
combination with the re-heat
setpoint [6‑0C].
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.