Supplied By www.heating spares.co Tel. 0161 620 6677
23
FAULT FINDING
8
8.1
GENERAL
Befor
e looking for a fault condition, check that:
• The mains electrical supply is turned on.
• The clock and/or room thermostat (if fitted) are calling for heat
(CH 'faults' only)
• The gas service cock is open.
• The CH and DHW isolation cocks are open.
• The system is at design pressure.
Before attempting any electrical fault finding, always conduct the
preliminary electrical system checks as described in the Instructions
for the British Gas Multimeter, or other similar instrument.
On completion of any service or fault finding operation involving
making or breaking electrical connections, always check for EARTH
CONTINUITY, POLARITY and RESISTANCE TO EARTH.
LED 1
•
•
•
•
CLOCK
•
PRESSURE
GAUGE
•
DHW TEMP
CONTROL
•
CH TEMP
CONTROL
•
ON/OFF
SWITCH
•
LED 3
LED 2
LED 4
•
RESET & bur
ner/
lock-out LED
F
ACIA PANEL
8.2
DIAGNOSTIC INDICATOR LED’S
F
ASCIA PANEL
The
Reset
LED shows steady RED in a lockout condition.
To access the error codes, press the
Reset
button for thr
ee
seconds and the LED will begin to flash.
For fault finding, refer to the diagnostic chart shown below,
together with the notes given in sections 8.3, 8.4 and 8.5
8.3
IGNITION FAULT FINDING
In the event of the boiler failing to light, r
efer to the
Diagnostics Chart.
Detailed procedures for replacing faulty components are described in
section 9 (Parts Replacement).
For further information contact: Halstead Boilers Ltd.,
Service Help line : 01926 834834
LED CODE
FAULT
REASON
ACTION
●
●
●
●
●
●
W
ater pressure switch inoperative
Low water pressure
• Check water pressure (> 0.5 bar)
• Check CH pump/ expansion vessel
• Check switch
●
● ●
●
● ●
Lockout flame signal
No flame signal on ignition,
• Check detection electrode/lead
or loss of signal during
• Check gas supply
operation
• Check gas valve and lead
• Check PCB/spark generator
●
●
● ● ●
Er
roneous APS signal
Missing or defective APS signal
• Check APS
• Check pipe connections for blockage
• Check fan
• Check PCB
• Check flue condition
●
● ●
● ●
●
●
Over
heat thermostat activated
Boiler temperature > 105°C
• Check CH/O’heat thermistor
• Check wires to sensor
• Check no air is in CH system
• Check PCB
• Check pump
●
●
●
●
●
●
No DHW temperatur
e control
Defective DHW sensor
• Check DHW sensor
• Check wires to sensor
●
●
● ●
●
●
5 sec flame signal after bur
ner is switched off
Defective gas valve
• Check gas valve and lead
• Check PCB
● ●
●
● ●
●
BCC er
ror
Wrong/missing BCC
• Burner off
● ● ●
●
●
Activate BCC
New BCC, press reset to activate
• Burner off
●
●
● ●
●
●
Er
ror in power supply
Low mains voltage
• Check mains voltage
●
●
● ●
● ●
●
CRC er
ror
Internal Eprom data error
• Check PCB
● ● ● ●
Safety system failur
e
Failure of internal self checking system
• Check PCB
1 2 3 4
●
=
LED ON
●
●
= LED OFF
