Vaillant ecoTEC plus VU 446/5-5 (H-GB) Installation And Maintenance Instructions Manual page 35

▶
Instead of grease, use only water or com-
mercially available soft soap to aid install-
ation.
12. Replace the seals.
13. Insert the flow and return pipes into the heat exchanger
as far as they will go.
14. Ensure that the clips on the flow and return connection
have been attached correctly.
15. Install the compact thermal module. (→ Page 38)
16. Fill and purge the product and, if necessary, the heating
installation.
10.9.6 Replace the pressure sensor
2
1
1. Pull out the plug for the pressure sensor.
2. Remove the fastening clip (1).
3. Remove the defective pressure sensor (2).
4. Replace the pressure sensor.
5. Fill and purge the product and, if necessary, the heating
installation.
10.9.7 Replacing the heating flow and return
temperature sensor
Applicability: VU 446/5-5 (H-GB)
1
4
▶
Pull out the heating flow (4) and return temperature
sensor (3).
0020261389_02 ecoTEC plus Installation and maintenance instructions
2
3
Applicability: VU 606/5-5 (H-GB)
1
4
▶
Pull out the heating flow (4) and return temperature
sensor (3).
1. Remove the heating flow (1) and return plug (2).
2. Install the new temperature sensor.
3. When reinstalling, note the colour of the conductors.
–
Blue conductor: Heating return
–
Red conductor: Heating flow
10.9.8 Replacing the pump
2
1
4
1. Pull out the plug (5) for the pump.
2. Remove the clip (1) from the pipe (2).
3. Detach the connection (3) from below the pump.
4. Remove the defective pump (4).
5. Detach the connection (5) from the pump.
6. Replace the seals.
7. Install the new pump. To do this, proceed in reverse
order.
Troubleshooting 10
2
3
3
35