F
ASCIA PANEL
1
DIGIT
AL CODE FAULT/EFFECT
REASON
1
Over
heated appliance
Water temperature greater than 105
°
C
Water flow failure or Differential check faulty/
2
Flame for a shor
t period only
Sensor temperature differential incorrect
No gas or Lockout flame signal/ No flame,
Low gas pressure.
3
Lockout after 5 ignition attempts
No flame signal on ignition, or loss of signal during operation
4
Flue gas sensor/No flame
Flue gas temperature greater than 95
°
C
4.3
TO TURN THE BOILER OFF
For shor
t or long periods
Switch the pr
ogrammer and/or room thermostat switch to the
OFF
position.
Note:
The appliance is fitted with a fr
ost protection device. In the
event of very cold conditions, the pump may operate and the
boiler light for a few minutes to protect the appliance and system
from potential frost damage. This can only function if the gas and
electricity supplies are maintained and the control knob on the appliance
is set to the STAND-BY position.
This function automatically operates the boiler when the heating system
water reaches temperatures below 5
o
C.
If either the gas or electricity services is to be isolated during a period
when frost is likely, the water circuits must be drained.
4.2
CONTROL OF WATER TEMPERATURE
CH:
Adjustable via the CH temperatur
e control knob to give radiator
temperatures of between 30°C and 80°C. To operate the boiler more
efficently it is recommended to set the CH temperature about half way
(between '+' and '-'). Please check with your installer the size of your
radiators.
During periods of no central heating requirement, this control should be set
to the Standby position.
Note:
If the display shows a flashing '
H
' the boiler is in ser
vice mode
and the boiler will fire continously at minimum input.
This setting is for the convenience of the Ser
vice Engineer ONLY.
4.4
BOILER OVERHEAT THERMOSTAT
The appliance is fitted with two ther
mistors located on the flow and
return pipes. In the event of overheating, the boiler
will shut down and the display will show '
1
'. Allow the boiler
to cool, then briefly turn the control knob to RESET/STAND-BY position
and then back to 'ON' within TWO seconds.
If the fault persists, consult a CORGI registered installer.
4.5
DIAGNOSTIC DIGITAL DISPLAY
Should the boiler fail for any r
eason the digital display will show a flashing
error code and the boiler will enter a lockout condition.
For faultfinding, refer to the diagnostic chart shown below, together with the
notes given in sections 8.3, 8.4 and 8.5 of the boilers installation and
service manual.
To RESET the boiler turn the control knob fully anti-clockwise to the
RESET/STANDBY position and then back to 'ON' within TWO seconds.
Note:- When a room thermostat is fitted, the central
heating control knob simply controls the rate at which
the boiler will achieve the required temperature.
See figure 1 for 'Optimum' setting.
DIGIT
AL CODE FAULT/EFFECT
REASON
5
Defective sensor/No flame
Defective flow, return or flue sensor
Defective gas valve/
5 sec flame signal after burner
6
Flame continues after demand ends
is switched off
7
Defective fan/No flame
Missing or Erroneous RPM signal
A
PCB er
ror/No flame
Internal error
Activate BCC/No flame
New BCC
C
Safety system failur
e/No flame
Failure of internal self checking system
E
BCC er
ror/No flame
Incorrect /missing BCC
RESET LOCK-OUT CODES
BLOCKING CODES
