22
These series of checks must be carried out be-
fore attempting any faultfinding procedures on the
appliance. On completion of any task that required
the disconnection and re-connection of any elec-
trical wiring or component, these checks must be
repeated.
7.9
FAULT FINDING
Before attempting any faultfinding, the electrical
checks as detailed in 7.8 must be carried out.
Isolate the appliance from the electrical supply.
Disconnect any external controls from terminal
plug M6 (fig. 16), and insert a link-wire between
the two wires at the ‘TA’ connections (fig. 19).
NOTE
Restore the electrical supply to the boiler and turn
the selector switch to the on position. The boiler
should now function as described in section 7.2.
Should the boiler fail to respond, the internal fuses
and connectors should be checked to ensure
integrity and continuity. If the boiler still fails to
respond, refer to the detailed faultfinding flow-
charts located at the end of this section.
7.10
BOILER CONFIGURATION
The boiler can be configured by means of the
JUMPER Tag which configuration is shown in the
below:
JP4 CONFIGURATION
●
●
●
●
●
JUMPER ON POSITION 1: FLOOR
HEATING (IF SET)/STANDARD
HEATING (IF NOT USED)
●
●
●
●
●
JUMPER ON POSITION 2: (UNUSED)
●
●
●
●
●
JUMPER ON POSITION 3: (UNUSED)
●
●
●
●
●
JUMPER ON POSITION 4: (UNUSED)
●
●
●
●
●
JUMPER ON POSITION 5: COMBI
●
●
●
●
●
JUMPER ON POSITION 6:
(UNUSED)
FOR CONFIGURATION SEE
REFERENCE NUMBER (PIN1 ON
PCB) AS SHOWN IN BELOW.
7.12
COMPONENT VALUES & CHARACTERISTICS
COMPONENT
VALUE
Fan
230Vac
Pump
230Vac
Valve actuator (Combi only)
230Vac
Ignition transformer
230Vac
Gas valve
230Vac
Room thermostat connection
230Vac
NTC thermistor (dry contact)
10Kohm
NTC thermistor (wet contact)
10Kohm
FUNCTION
VALUE
Standard Heating temperature
range (min – max °C)
40 - 80
Floor Heating temperature
range (min – max °C)
20 - 45
DHW temperature
range (min – max °C)
35 - 60
75% maximum CH time
15 min
Heating OFF hysterisis (°C)
SP + 5
Heating ON hysterisis (°C)
SP – 5
DHW OFF hysterisis (°C)
SP + 5
DHW ON hysterisis (°C)
SP + 3
Anti-cycle delay
3-min
Pump over-run
30-sec
Low output (min. %)
Min+25
CO function max temp. (°C)
95
CO re-light temp. (°C)
75
CO function time
15-min
Flow NTC max temp. (°C)
95
High limit thermostat (°C)
105
Burner thermostat (°C)
170
Maximum differential (°C)
35
IGNITION CONTROL
VALUE
Ignition attempts before L/O (lockout)
5
Re-ignition attempts after loss
of flame signal
5
JP4
7.11 FAULT CODES
When the boiler detects a temporary fault condition, the appropriate code is shown flashing on the display. If/when the
fault code is final, the pump will perform a 60-second post circulation and the red LED will be illuminated.
CODE CAUSE
ALARM TYPE
ACTION
AL10
Ignition failure, flame not sensed,
Final
Reset, check appliance operation
condense sensor activated
AL20
Limit thermostat fault/fumes thermostat fault
Final
Reset, check appliance operation
AL21
External device fault (UHT/CPA)
Final
Reset, check appliance
AL26
Return temperature too high
Temporary than
Reset, check appliance operation,
final
check thermistor
AL28
Temperature differential inverted
Temporary than
Reset, check pump, ensure there is sufficient
(return sensor temperature higher than
final
circulation around heating circuit/s
thermistors flowsensor temperature)
AL34
Fan tacho signal fault
Final
Reset check appliance operation, check fan
AL40
Insufficient system water pressure
Final
Check/refill system pressure, reset,
check appliance operation
AL41
Insufficient system water pressure
Temporary
Check/refill system pressure,
check appliance operation
AL52
Internal fault
Final
Reset, check appliance operation
AL55
Jumper tag fault
Final
Check jumper tag configuration
AL60
DHW thermistor fault
Temporary
Check DHW thermistor
AL71
Primary (flow) thermistor fault
Temporary
Check primary thermistor, check wiring
AL73
Return thermistor fault
Temporary
Check return thermistor, check wiring
AL74
Over temperature due to
Final
Reset, check appliance operation, check
low H
2
O pressure
pump, ensure there is sufficient circulation
around heating circuit/s
AL79
Flow temperature too high,
Temporary than
Reset, check appliance operation,
temperature differential too high
final
check thermistors
