Repair Procedures - Daikin altherma 3 M Service Manual

3 | Components

3.23.2 Repair procedures

To remove the water pressure sensor wiring harness
Service manual
274
6 With the water pressure sensor connector X7Y connected, measure the
voltage between pin 1–2 (= water pressure output).
7 Check that the measured voltage is in line with the expected voltage through
the measured water pressure.
The measured voltage is inside the
expected range?
Yes
No
8 Measure the voltage between pin 2–3 (= water pressure sensor power supply)
of the water pressure sensor connector X7Y.
I measured voltage...
Is +5 V DC
Is NOT +5 V DC
9 Unplug the connector X60A and measure the voltage (power supply) between
pin 3–4 on hydro PCB.
Is the measured voltage +5 V DC?
Yes
No
10 Disconnect the connector from the water pressure sensor and the connector
X7Y and measure the continuity of the wiring harness.
Is continuity of the wiring harness
correct?
Yes
No
Prerequisite: Stop the unit operation via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
Prerequisite: Remove the required plate work, see
1 Disconnect the connector from the water pressure sensor.
2 Disconnect the other end of the wiring harness from the connector X7Y.
3 Cut all tie straps that fix the wiring harness, and remove the wiring harness
from the unit.
Action
Correct the wiring between the hydro
PCB and the water pressure sensor
connector X7Y, see "6.2 Wiring
4
diagram" [ 314].
Continue with the next step.
Then
Skip the next step.
Continue with the next step in the
procedure
Action
Correct the wiring between the hydro
PCB and the connector X7Y, see
4
"6.2 Wiring diagram" [
Perform a check of the hydro PCB, see
"3.12.1 Checking procedures" [
Action
Replace the water pressure sensor, see
"3.23.2 Repair procedures" [
Replace the water pressure sensor
harness, see "3.23.2 Repair
4
procedures" [ 274].
"3.17 Plate work" [
EBLA09~16DA + EDLA09~16DA
314].
4
160].
4
274].
4
230].
Daikin Altherma 3 M
ESIE20-06A – 2021.03