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
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