Supplied By www.heating spares.co Tel. 0161 620 6677
40
SECTION 9
FAULT FINDING CENTRAL HEATING
Before trying to operate the boiler make sure that:
- All gas supply cocks are open and the gas supply has been purge of air.
- The heating system pressure is at least 1 bar min to 1.5 bar Max.
- Main Switch on
- Select “Winter”
- Central Heating control knob to maximum
- Ensure external controls calling for heat (Room stat/Timeclock/TRV)
Does heating LCD
on digital display
illuminate
No
Is 230 at L-N
connections on
control board
No
Check/Replace
external Fuse and
supply
Yes
Replace On/Off Switch
Does the pump run
Is low pressure
in the system
Re-pressure the
system
Is 230V at pump
Check/Replace
pump if necessary
No
Yes
Yes
No
Yes
Is there continuity at
summer/winter switch
Replace
summer/winter switch
Check /Replace Timeclock
if OK Replace control board
No
Yes
No
Is the burner LCD
illuminate on
digital display
Yes
No
Is
17
displayed
Yes
FAILED FAN SEQUENCE
- Check Fan Voltage
No
Is
01
displayed
Yes
FAILED IGNITION SEQUENCE
- Check condensate drain if is not blocked
- Check gas valve operation
- Check the fan starts
- Check Ignition control board and cables
Is
28
displayed
Is
12
displayed
FAILED LOW WATER PRESSURE SWITCH
- Check /Replace Low water pressure switch
- Check system pressure
FAILED HEATING SENSOR
- Check / Replace heating sensor
Yes
Yes
No
No
Is
04
displayed
FAILED OVERHEAT
- Check / Replace heating sensor
- Check the overheat thermostat
Yes
No
RESET THE BOILER
- Push the Reset button on Digital Display and
check LCD if illuminate
Yes
Does boiler go off
before set point
Yes
- Check if the system has been purge of air
- Check / Replace Automatic air vent
No
-
Check Domestic Hot Water
NOTE :
See Section 10 for LED DISPLAY CODE
