54
fig. 94
GW 520/0
fig. 95
GW 523/0
7.22.1 Replacement of boiler
display board (fig. 94)
•
Slide the connecting plug (1) for-
wards to release from connecting
pins.
•
Move retaining clips (2) outwards
and slide board upwards to
remove.
•
Reassemble in reverse order.
•
Carry out electrical checks
(see Section 5.1)
7.22.2 Replacement of rectifier
board
•
Remove screw (3, fig. 94) and lift
cover panel (4, fig. 94) off control
box.
•
Unplug two leads (1, fig. 95) from
the mother board.
•
Remove two screws (2, fig. 95) and
remove rectifier board.
•
Reassemble in reverse order.
•
Carry out electrical checks
(see Section 5.1)
7.22.3 Replacement of mother
board (fig. 96)
•
Remove rectifier board as in
Section 7.22.2.
•
Disconnect all plug connectors (1)
from board.
•
Disconnect white wire (2) from
earth terminal strip
•
Disconnect pump supply plug (3)
and lift clear of board.
•
Push two spring retainers (4) to the
right and lift right hand side of
circuit board off retainers.
•
Lift and pull circuit board to the
right to release from retainer lugs
(5).
•
Reassemble in reverse order.
•
Carry out electrical checks
(see Section 5.1)
fig. 93
GW 455/0
fig. 96
GW 522/0
