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22
221481C
11 Fault Finding
Diagram 11.3 continued
PERMANENT
LIVE
240V
50 Hz
FUSED
AT 3A
RED LINK
(If no switch
control is used)
MAIN TERMINAL
STRIP
THERMOSTAT
TERMINALS
SWITCH
CONTROL
(If used)
COMBINED
THERMOSTAT
AND PUMP
OVERRUN
BROWN
RED
BRN
GAS
VALVE
PURPLE
BLUE
L
N
BLUE
BLUE
BRN
BLUE
TO
PUMP
N
N
8
7
3
6
9
8
7
SL
9
L
Solenoid
2415
Diagram 11.4
FUNCTIONAL FLOW
Does pump run ?
Turn ON thermostat;
Is there 240V between 7 and N ?
YES
NO
With thermostat set to MAX. allow appliance
temperature to reach max.
When appliance cuts out on temp. is there
240V between 7 and N ?
With Remote Controls NOT Calling for Duty
does pump stop when the appliance has
cooled down ?
CONTROLS IN ORDER
Faulty Cable (PURPLE) between thermostat
and terminal block, repair or renew.
Faulty pump, inform customer
Faulty thermostat, renew.
YES
YES
YES
NO
NO
NO
YES
Continued
Continued
MAIN TERMINAL STRIP
THERMOSTAT TERMINALS
NO
4403A
11.8 Electrical
IMPORTANT. On completion of the service/fault finding task
which has required the breaking and remaking of electrical
connections then the checks, earth continuity, polarity and
resistance to earth must be repeated, using a suitable multimeter.
To check the boiler thermostat and multi-functional control (gas
valve), see diagram 11.3 and functional flow wiring diagram
11.4.
To check thermostat pump overrun circuit see diagram 11.3
and functional flow wiring diagram 11.4.
11.9 Pilot
Refer to fault finding for pilot, see diagram 11.5.