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41
FAULT FINDING DOMESTIC HOT WATER
Before continuing it may be necessary to see Central Heating Fault Finding (Sect.9)
- 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 “Summer” (Fig.50 item 1A)
- Domestic Hot Water control knob to maximum
- Open Domestic hot tap close to the appliance
Ensure Domestic
Hot Water fl ow is
min. of 3 l/min
Check fi lters are
clean
No
Is low pressure
in the system
Re-pressure the
system
Check Microswitch
on shunt valve
being operate
mechanically
Check/Replace
diverter valve
No
Yes
Yes
No
Yes
No
Does the burner
LCD illuminate on
digital display
Yes
No
Yes
FAILED DHW SENSOR
- Check /Replace DHW sensor and cables
No
Yes
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
No
RESET THE BOILER
- Push the Reset button on Digital Display and
check LCD if illuminate
Yes
Does the DHW
temperature
stabilise at set point
Yes
Check / Replace DHW potentiometer
No
END OF DOMESTIC HOT WATER TEST
Does DHW LCD
on digital display
illuminate
Check/Replace
diverter valve
Is
06
displayed
No
Check / Replace DHW sensor
NOTE :
See Section 10 for LED DISPLAY CODE