Repair Procedures - Daikin EBLA04E V Series Service Manual

4 | Components

4.23.2 Repair procedures

To remove impurities from the water pump
Service manual
248
draft – 31/05/2022 15:53
U iH
U iL
T Period of time of complete cycle
t Period of time of high‑level input voltage
U High‑level input voltage
IH
U Low‑level input voltage
IL
d Duty cycle (t/T x 100) [%]
▪ When using any equipment that is capable to measure the duty cycle, the
measured signal MUST show profile A (see illustration below). The PWM signal
(duty cycle) is disproportional to the water pump speed (flow rate) in the range
of 10% to 84% and the speed (flow rate) remains at its maximum value when the
PWM signal (duty cycle) is below 10%.
a
a Pump speed
b PWM signal (duty cycle) [%]
Is the measured PWM signal correct?
Yes
No
15 Unplug the water pump connector X25A and measure the PWM signal
between pins 1‑2 on the hydro PCB. The measured signal MUST be as
mentioned in the previous step.
Is the measured PWM signal correct?
Yes
No
Prerequisite: Remove the water pump, see
1 Remove any impurities or objects that may block the water pump.
2 Install the water pump, see
T
t
b
Action
Replace the water pump, see
"4.23.2 Repair
Continue with the next step.
Action
Replace the PWM signal harness
between the water pump and the hydro
PCB, see
procedures" [
Perform a check of the hydro PCB, see
"4.12.1 Checking
"4.23.2 Repair
"4.23.2 Repair procedures" [
4
procedures" [ 248].
"4.23.2 Repair
4
248].
4
procedures" [ 175].
4
procedures" [ 248].
4
248].
EBLA04~08E + EDLA04~08E
Daikin Altherma 3 M
ESIE22-09 – 2022.05