Troubleshooting
3
Subject to modifications resulting from technical improvements!
Buderus Ltd. • http://www.buderus-domestic.co.uk
64
Servicing manual for wall-mounted condensing gas boiler 600 Series 11S/19S/24S/24C • Issued 02/2006
3.1.31 Checking the three-way motorised valve for
correct operation
z
Disconnect the system from the power supply, set mains
switch to "
0
".
z
Dismantle condensate trap.
z
Remove protective cap from three-way valve.
z
Remove bottom insulation from internal hot-water reservoir
(applies to GB122-24K only).
z
Push in catch on regulating motor and
z
remove bayonet connector by twisting anticlockwise.
z
Remove regulating motor.
z
Set the mains switch to “
I
” and press the “reset” button.
z
Once the 600 Series 11S / 19S / 24S / 24C is in operation,
open one of the hot-water taps.
The UBA displays "
=.
" for hot water. If the regulating
motor starts up (check for movement of adjusting lever),
the motorised head is working.
z
Shut the hot-water tap.
z
Set the mains switch to “
0
”.
z
If the motorised head is working, attach the regulating
motor and lock into place by twisting the bayonet
connector.
z
Connect the system to the power supply, set the mains
switch to “
I
” and press the “reset” button.
3.1.32 Replacing the motorised valve body control valve
z
Shut the servicing cock and drain the
600 Series 11S / 19S / 24S / 24C as per the "Installation
and Servicing Instructions".
z
Dismantle condensate trap.
z
Remove protective cap from three-way valve.
z
Remove bottom insulation from internal hot-water reservoir
(applies to 600 Serie 24 C only).
z
Push in catch on regulating motor and remove bayonet
connector by twisting anticlockwise.
z
Remove regulating motor.
z
Remove the control valve with a spanner and fit a new unit
(fig. 86).
z
Fit regulating motor and lock into place by twisting the
bayonet connector.
z
Reconnect the cable plug.
z
Set the mains switch to “
I
” and press the “reset” button.
Fig. 85 600 Series 11S / 19S / 24S / 24C:
Checking the motorised head for correct operation
Fig. 86 600 Series 11S / 19S / 24S / 24C:
Replacing the control valve
NOTE
Open servicing cocks, fill the 600 Series 11S /
19S / 24S / 24C and purge the system of air as
indicated in the installation and servicing
instructions.
