40
A
B
D
C
Fig. 29
A
Heat pump control unit
B
Reset button:
C
Button shown at bottom: Reset
D
Button shown at top: Locked out
1.
Switch OFF the power supply to the system (e.g. at
a separate fuse or mains isolator).
2.
Remove the front cover. See Fig. 26, page 38.
3.
Press the button with a screwdriver to reset.
4.
Fit the front cover with an earth cable.
5.
Switch ON the power supply.
Note
If the DHW heat pump high limit safety cut-out
locks out several times in a row, replace heat pump
control unit
A
.
Replacing the heat pump control unit
1.
Switch OFF the power supply to the system (e.g. at
a separate fuse or mains isolator).
2.
Remove the front cover. See Fig. 26, page 38.
4.
5.
3.
6.
A
B
Fig. 30
3.
Disconnect all cables
B
from heat pump control
unit
A
.
5.
Fit the new heat pump control unit.
6.
Connect the cables to the heat pump control unit.
7.
Fit the front cover with an earth cable.
8.
Switch ON the power supply.
9.
Set the parameters again.
Draining the DHW cylinder from the DHW side
1.
Shut off the cold water supply. See page 9.
2.
Open the DHW draw-off points to release pres-
sure.
Maintenance
Maintenance
(cont.)
6136003
Maintenance
