Symptom: Power Consumption Too High - Daikin altherma 3 M Service Manual

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.

2.4.13 Symptom: Power consumption too high

Possible failure
Too high domestic hot
water setpoint.
Too high leaving water
temperature setpoint.
Too high space heating
setpoint on room
thermostat.
Possible failure
Too high leaving water
temperature (LWT) -
weather dependent.
User interface thermostat
used with setting [C‑07] on
value 1 (= external
thermostat control).
EBLA09~16DA + EDLA09~16DA
Daikin Altherma 3 M
ESIE20-06A – 2021.03
Root cause category: component – electrical
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 category: end user
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 category: parameter (setting)
Root cause
Incorrect weather
dependent setting --> too
high LWT limit set
[1‑00]~[1‑09].
Wrong setting of [C‑07] -
unit control method.
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].
2 Troubleshooting
|
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.
Service manual
81