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These series of checks must be carried out before
attempting any faultfinding procedures on the
appliance. On completion of any task that required
the disconnection and re-connection of any
electrical 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 flowcharts
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.
7.11 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
AL10
Ignition failure/not flame sensed,
condense sensor activated
AL20
Limit thermostat fault
AL21
External device fault (UHT/CPA)
AL26
Return temperature too high
AL28
Temperature differential inverted
(return sensor temperature higher than
thermistors flowsensor temperature)
AL34
Fan tacho signal fault
AL40
Insufficient system water pressure
appliance operation
AL41
Insufficient system water pressure
AL52
Internal fault
AL55
Jumper tag fault
AL60
DHW thermistor fault
AL71
Primary (flow) thermistor fault
AL73
Return thermistor fault
AL74
Variation on temperature of primary
and/or return too high
AL79
Flow temperature too high, or
26
7.12
COMPONENT VALUES & CHARACTERISTICS
COMP
ONENT
Fan
Pump
Valve actuator (Combi only)
Ignition transformer
Gas valve
Room thermostat connection
NTC thermistor (dry contact)
NTC thermistor (wet contact)
FUNCTION
Standard Heating temperature
range (min – max
Floor Heating temperature
range (min – max
DHW temperature
range (min – max
75% maximum CH time
Heating OFF hysterisis (
Heating ON hysterisis (
DHW OFF hysterisis (
DHW ON hysterisis (
Anti-cycle delay
Pump over-run
Low output (min. output + %)
CO function max temp. (
CO re-light temp. (
CO function time
Flow NTC max temp. (
High limit thermostat (
JP4
Burner thermostat (
Maximum differential (
IGNITION CONTROL
Ignition attempts before L/O
(lockout)
Re-ignition attempts after loss
of flame signal
ALARM TYPE
ACTION
Final
Reset, check appliance operation
Final
Reset, check appliance operation
Final
Reset, check appliance
Final
Reset, check pump, ensure there is circulation
around heating circuit/s thenmistor
Final
Reset, check pump, ensure there is sufficient
circulation around heating circuit/s
Final
Reset check appliance operation, check fan
Final
Check/refill system pressure, reset, check
Temporary
Check/refill system pressure, check
appliance operation
Final
Reset, check appliance operation
Final
Check jumper tag configuration
Temporary
Check DHW thermistor
Temporary
Check primary thermistor, check wiring
Temporary
Check return thermistor, check /wiring
Final
Reset, check appliance operation, check
pump, ensure there is sufficient circulation
around heating circuit/s
Final
Reset, check appliance operation, check
VALUE
230Vac
230Vac
230Vac
230Vac
230Vac
230Vac
10Kohm
10Kohm
VALUE
0
C)
40 - 80
0
C)
20 - 45
0
C)
35 - 60
15 min
0
C)
SP + 5
0
C)
SP – 5
0
C)
SP + 5
0
C)
SP + 3
3-min
30-sec
Min+25
0
C)
95
0
C)
75
15-min
0
C)
95
0
C)
105
0
C)
170
0
C)
35
VALUE
5
5
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