Daikin EBLA04E V Series, Service Manual, Page: 94 / 324

3 | Troubleshooting
Service manual
94
EBLA04~08E + EDLA04~08E
Daikin Altherma 3 M
ESIE22-09 – 2022.05
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].
FOR UNITS WITH BIZONE KIT INSTALLED:
Possible failure Root cause Check Repair
Outlet water mixed zone
thermistor deviation
causes incorrect
temperature control of the
mixed zone (low
temperature). Deviation of thermistor
(lower temperature
measured than actual).
▪ Bad contact between
sensor and pipe.
Check outlet water mixed
zone thermistor. Replace outlet water mixed
zone thermistor or bizone
PCB.
3‑way valve bypassing. 3‑way bypass valve
jammed. check operation 3‑way mix
valve. See component check
3‑way mixing valve.
Insufficient water flow in
the mixed zone. Bizone pump jammed. Check bizone pump. See component check
bizone pump.
Mixed circuit water filter
clogged. Verify mixed zone water
filter. Clean mixed zone water
filter, see maintenance.
3.4.13 Symptom: 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).
draft – 31/05/2022 15:53