10 Inspection and maintenance
16
Installation and maintenance instructions eloBLOCK 0020265768_01
10.6
Replacing the heating rods
1
1.
Disconnect the heating rod cable connections
(1)
to the
PCB and to the mains terminal block (N, blue).
2.
Unscrew the earth line.
3.
Use a suitable open-ended spanner to unscrew the
heating rod from the heat exchanger in an anti-clock-
wise direction.
4.
Use a suitable open-ended spanner to screw in a new
heating rod in the heat exchanger in a clockwise direc-
tion.
5.
Check all water-bearing connections for leak-tightness
and check that the plug connections are firmly seated.
6.
Ensure that the contactors and relays do not jam.
10.7
Replacing the expansion relief valve
1
1.
Remove the safety clip
(1)
and remove the expansion
relief valve from the product.
2.
Insert a new expansion relief valve and use the safety
clip to secure it in place.
3.
Check that the new expansion relief valve is seated
firmly and check it for tightness.
10.8
Replace the pressure sensor
2
1
3
1.
Remove the plug
(1)
.
2.
Use a screwdriver to remove the safety clamp
(2)
.
3.
Remove the pressure sensor
(3)
.
4.
Insert a new pressure sensor.
5.
Place the safety clamp on the pressure sensor.
6.
Place the plug on the pressure sensor.
7.
Check that the safety clamp and plug are seated firmly.
10.9
Replacing the NTC sensor
1
1.
Remove the two plugs from the NTC sensor
(1)
.
2.
Completely remove the NTC sensor along with the re-
tainer.
3.
Install a new NTC sensor.
4.
Position both plugs.
5.
Check that the retainer and the plugs are seated firmly.
10.10 Replace the safety cut-out
1
1.
Remove the two plugs from the safety cut-out
(1)
.
2.
Remove the screw from the retainer and remove the
safety cut-out from the retainer.
3.
Install a new safety cut-out.
4.
Position both plugs.
5.
Check that the safety cut-out is firmly against the heat
exchanger.
