Power Consumption Too High - Daikin Altherma EBLQ011CAV3 Service Manual

1 Troubleshooting
Root cause category: component – electrical
Possible failure
Outlet water after backup heater
thermistor deviation causes
incorrect temperature control.
Deviation of domestic hot water
tank thermistor.
(Remark: ONLY valid for
inaccurate domestic hot water
temperature control.)
User interface – thermostat sensor
has incorrect reading of room
temperature.
1.5.13

Power consumption too high

Root cause category: end user
Possible failure
Too high domestic hot water
setpoint.
Too high leaving water
temperature setpoint.
Too high space heating setpoint
on room thermostat.
Root cause category: parameter (setting)
Possible failure
Too high leaving water
temperature (LWT) - weather
dependent.
User interface thermostat used
with setting [C‑07] on value 1 (=
external thermostat control).
Pump keeps running all the time
during space heating operation.
Setting disinfection operation day
[2‑00] was set to 0 (each day).
Unit is running in emergency
operation and is using backup
heater ONLY. [4‑06] is set to 1.
Backup heater equilibrium point
was set too high.
Setting domestic hot water
operation mode [6‑0D] NOT set
optimally.
Service manual
32
Root cause
▪ Deviation of thermistor (lower
temperature measured than
actual),
▪ Bad contact between sensor
and pipe.
▪ Deviation of thermistor,
▪ Bad contact between sensor
and pipe.
Deviation of user interface room
temperature sensor.
Root cause
User set too high domestic hot
water setpoint by schedule or
manual operation.
User set too high leaving water
temperature setpoint by schedule
or manual operation.
User set too high room setpoint by
schedule or manual operation.
Root cause
Incorrect weather dependent
setting --> too high LWT limit set
[1‑00]~[1‑09].
Wrong setting of [C‑07] - unit
control method.
Wrong setting of [F‑0D] - pump
operation.
Setting disinfection operation day
[2‑00] was set to 0 (each day).
Unit is running in emergency
operation and is using backup
heater ONLY. [4‑06] is set to 1.
Setting "equilibrium
temperature" [5‑01] was set too
high.
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
Check outlet water after backup
heater thermistor.
Check domestic hot water tank
thermistor.
Compare temperature measured
by user interface with actual room
temperature.
Check
Check domestic hot water tank set
temperature; avoid electric heater
use.
Check leaving water setpoint.
Check room thermostat setpoint.
Check
Check leaving water temperature
(LWT) high limit in weather
dependent (setting [1‑03]).
Check setting [C‑07].
Check pump operation mode
setting [F‑0D].
Check setting [2‑00].
Check setting [4‑06].
Check setting [5‑01].
Check setting [6‑0D] in
combination with the re-heat
setpoint [6‑0C].
EBLQ+EDLQ011~016CAV3+W1 + EBLQ+EDLQ011~016CA3V3+W1
Repair
Replace outlet water after backup
heater thermistor or hydro PCB.
Replace domestic hot water tank
thermistor or hydro PCB.
In case of deviation the room
temperature offset can be adjusted
through setting [2‑0A].
Repair
Adapt domestic hot water setpoint
(e.g. 50~55°C).
Adapt leaving water setpoint (e.g.
<55°C will reduce backup heater
operation).
Adapt room thermostat setpoint.
Repair
Adapt high leaving water
temperature (LWT) limit for
weather dependent heating
(setting [1‑03]).
Adjust setting to match application
- see installer reference guide.
Change setting [F‑0D] from
continuous operation (value 0) to
Sample (1) or Request (2). See
installer reference guide for
applicable value.
Adjust setting if necessary.
Adjust setting if necessary.
Change setting [5‑01] to less
quickly allow backup heater
operation.
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.
+ EK(2)CB07CAV3 + EKMBUHCA3V3+9W1
Daikin Altherma – Monobloc
ESIE18-04 – 2019.02