11
14
8.9
ELECTRICAL ASSEMBLY REMOVAL:
8.9.1
Ensure that the electrical supply is isolated.
8.9.2
Remove the appliance front door, release the 2 x securing screws and hinge down the electrical panel.
SYSTEM E-T models:
8.9.3
Disconnect the following
a.
Air circulation fan flying leads from the capacitor and withdraw from the cable clamp,
b.
230V mains ‘
L
’,
‘
N
’ and ‘
E
’ from connection block terminals ‘
1
’ and ‘
2
’, and
Earth stud
respectively,
c.
Thermista-stat connections from connection block terminals ‘
7
’ and ‘
8
’,
d.
Limit switch from connection block terminals ‘
13
’ and
‘
14
’,
e.
Fan Delay Control from connection block terminals ‘
18
’ and
‘
17
’,
f.
Multifunctional Control from connection block terminals ‘
16
(N) and ‘
15
’ (L), and
Earth stud.
g.
Water heater from connection block terminals ‘
10
’ (L) and ‘
9
’ (N),
h.
Water Pump from connection block terminals ‘
12
’ (L) and ‘
11
’ (N),
i.
Cleanflow from connection block terminals ‘
19
’ (24V) and ‘
20
’ (0V),
j.
Earth lead from the fan chamber floor,
CONVENTIONAL Control models:
8.9.4
Disconnect the following:
a.
Air circulation fan flying lead from the flying lead socket and withdraw from the cable clamp,
b.
230V mains ‘
L
’,
‘
N
’ and ‘
E
’ from connection block terminals ‘
1
’ and ‘
2
’, and
Earth stud
respectively,
c.
Room thermostat connections from connection block terminals ‘
7
’ and ‘
8
’,
d.
Limit switch from connection block terminals ‘
13
’ and
‘
14
’,
e.
Fan Delay Control from connection block terminals ‘
18
’ and
‘
17
’,
f.
Multifunctional Control from connection block terminals ‘
16
(N) ,‘
15
’ (L) and
Earth stud.
g.
Water heater from connection block terminals ‘
10
’ (L) and ‘
9
’ (N),
h.
Water Pump from connection block terminals ‘
12
’ (L) and ‘
11
’ (N),
i.
Cleanflow from connection block terminals ‘
19
’ (24V) and ‘
20
’ (0V),
j.
Earth lead from the fan chamber floor,
Both model types:
8.9.5
Release the hinge pins and withdraw the Electrical assembly, releasing wiring from cable clamps and grommets
as required.
8.9.6
Refitting or replacement is in reverse order.
8.10
ELECTRONIC MODULE REMOVAL (SYSTEM E-T models only)
8.10.1 Ensure that the electrical is isolated.
8.10.2 Remove the appliance front door, release the 2 x securing screws and hinge down the electrical panel.
8.10.3 Disconnect terminals ‘
21
’
to ‘
33
’ from the Electronic module.
8.10.4 Release the 2 x screws and nuts securing Electronic module to Electrical assembly and remove module.
8.10.5 Refitting or replacement is in reverse order.
8.11
TRANSFORMER REMOVAL (BASIC Control models only):
8.11.1 Ensure that the electrical is isolated.
8.11.2 Remove the appliance front door, release the 2 x securing screws and hinge down the electrical panel.
8.11.3 Disconnect the Transformer as follows:
a.
RED
Fan Speed voltage selector from the transformer terminal block,
b.
BROWN
conductor from electrical panel connection block terminal ‘
1
’,
c.
BLUE
conductor from electrical panel connection block terminal ‘
2
’,
d.
PURPLE
conductor from relay panel terminal marked ‘
0V
’,
e.
YELLOW
conductor from relay panel terminal marked ‘
24V
’,
8.11.4 Release 2 x screws, nuts and star washers securing Transformer to the Electrical assembly, and remove the
Transformer.
8.11.5 Refitting or replacement is in reverse order.
Fig. 5
SYSTEM E-T Electronic module
Basic control models:
j.
Pilot alight but main
i.
Mains electrical supply not
Check mains supply.
burner not igniting.
connected to heater.
ii. Controls not demanding heat
Check that time control (if fitted) and
room thermostat are operating correctly.
iii. T3.15A fuse failed.
Replace. If failure occurs again, check
wiring for short circuits.
iv. Loose connection to room thermo-
Check connections.
stat, limit switch, multifunctional
control lead, time control, relay
module or 24V transformer.
v. 230V/24V transformer failure.
Check 24V side with test meter, if voltage
missing, replace transformer.
vi. Faulty relay module
Check 230V at white wire from switch S5
vii. Multifunctional control faulty.
Replace Multifunctional control.
viii.Limit control faulty.
Short circuit control and replace if necessary.
ix. Room thermostat or external
Fit temporary loop in heater thermostat
wiring faulty.
socket. If heater ignites, external circuit
or room thermostat is faulty.
9.3
The SYSTEM E-T module is fitted with a diagnostic light emitting diode (LED) which is visible through a hole in the
module cover, as shown in Fig. 5 below. If the LED is flashing, this means that :
9.3.1
The fan is not connected, or
9.3.2
The capacitor is not connected, or
9.3.3
There is a short circuit in the fan supply.
Diagnostic LED
