Service Function
Economy/Comfort
Error Code LED
DHW Economy/
Comfort Switch
24hr Clock
Pressure
Gauge
DHW
Temperature
Control
BURNER (Blue)
LOCK-OUT (Red)
LED and
Reset Button
CLOCK OVERRIDE
SWITCH (Heating only)
ARROW
INDICATES
CURRENT TIME
CH Error Code
Indicator
Mains ON/OFF
Switch
CH Temp.
Control
= Continuous ON
= Timed
= OFF
TABS OUT
=
ON
PERIOD
TABS IN
=
OFF
PERIOD
FASCIA PANEL AND CONTROLS (CBX model shown)
FASCIA PANEL
2
LED 1
LED 2
LED 3
LED 4
CLOCK
PRESSURE
GAUGE
DHW TEMP
CONTROL
CH TEMP
CONTROL
ON/OFF
SWITCH
RESET & burner/
lock-out LED
1
LED CODE
FAULT/EFFECT
REASON
1 2 3 4
HHHG
Overheated appliance
Water temperature greater than 105 °C
HHGH
No gas/No flame
Low gas pressure
HHGG
Lockout flame signal/Lockout after 5 ignition
No flame signal on ignition, or loss of signal during operation attempts
HGHH
Flue gas sensor/No flame
Flue gas temperature greater than 95 °C
HGHG
Defective sensor/No flame
Defective flow, return or flue sensor
HGGH
Defective gas valve/Flame continues after demand ends
5 sec flame signal after burner is switched off
HGGG
Defective fan/No flame
Missing or Erroneous RPM signal
GHHH
CRC error/No flame
Internal Eprom data error
GHHG
Error in power supply/No flame
Low mains voltage
GHGH
Water flow failure/Flame for a short period only
Sensor temperature differential incorrect
GHGG
PCB error/No flame
Internal error
GGHH
BCC error/No flame
Incorrect /missing BCC
GGHG
Differential check faulty/Flame for 15 seconds
Zero check faulty DHW or CH
GGGH
Activate BCC/No flame
New BCC
GGGG
Safety system failure/No flame
Failure of internal self checking system
HHHH
DHW cold
Defective DHW turbine or Diverter valve
HHHH
No light indication
Defective power supply
HHHH
No flame
Faulty connector
751031 USER GUIDE (NEW) 28/9/10 10:06 Page 3
