59
4) Ensure the heating system is full of
water and charged to approx. 1
Bar. If not refill system and vent
(see section 5.4: Filling the heating
system). Ensure boiler flow and
return service valves are open.
Check condensate trap is filled
(see Section 5.6).
5) Check that boiler on/off control is
set to 'on' position
6) Set boiler central heating control to
'Heating and Hot Water' position.
7) Ensure that the Maximum Radiator
Temperature and Maximum Hot
Water Temperature controls are set
to position '9'.
8) Check that all the external controls
are on and calling for heat (if no
external controls are fitted, boiler
terminals 3 and 4 must be linked).
Check that boiler anti-cycling 'eco-
nomiser' control is not engaged
(see Section 4.9.7).
8.2.2 Procedure
Note:
Always check the operation of
the boiler for central heating first be-
fore checking hot water operation.
Do not open a hot tap unless instruc-
ted to by the fault finding guide.
1) IF A FAULT CODE IS SHOWING IN
THE BOILER DISPLAY GO TO
SECTION 8.3: FAULT DIAGNOSIS
USING THE BOILER FAULT MODE.
2) IF THE BOILER IS NOT FUNCTION-
ING CORRECTLY AND A FAULT
CODE IS NOT SHOWING IN THE
BOILER DISPLAY GO TO SECTION
8.4: FAULT DIAGNOSIS USING THE
BOILER STATUS MODE.
3) NOTE:
IF THE BOILER DISPLAY IS COMP-
LETELY BLANK INITIALLY CHECK
THE TWO 2A FUSES (F1 AND F2)
AND THE 1A FUSE (F5), FIG. 110.
(Isolate electrical supply before
checking fuses!)
(Spare fuses are located on the
inside of the control box cover).
fig. 110
GW 506/0
Mother
board
Rectifier
F1 (2A)
F2 (2A)
Relay
Board
Display
Board
CPU Board
F4 (4A)
F5 (1A)
F3 (0,1A)
