Supplied By www.heating spares.co Tel. 0161 620 6677
RECTIFYING FAULTS
8 716 115 748 (2009/09)
32
A7
and fault indicator LED are flashing.
(Boiler still produces hot water but at a lesser degree of accuracy over the temperature.)
Water NTC sensor defective.
Check
Action
1.
B
Check if the water NTC connector
corroded, damaged or dirty.
yes:
B
Change relative parts.
A7? go to 2
no:
go to 2
2.
B
Switch OFF the appliance.
B
Disconnect the boiler power
connection.
B
Un-plug 20-pin connector from
PCB.
B
Check resistance from
connections 3 to 4 on the cable
side. Does the value match the
ones described in table 38,
page 71?
yes:
B
Connect the boiler electrical connection.
B
Switch ON the appliance.
B
Make a note of the altered service function
settings (see table 6 on page 18) in order to keep
the altered values.
B
Switch OFF the appliance.
B
Disconnect the boiler power connection.
B
Change PCB control board.
B
Reconnect the appliance power connection.
B
Switch ON the appliance.
B
Restore service settings previously noted.
no:
go to 3
3.
B
Un-plug NTC sensor from cable.
B
Check resistance of NTC sensor.
Does the value match the ones
described in table 38, page 71?
yes:
B
Change the 20-pin connector lead assembly.
B
Reconnect the boiler electrical connection.
B
Switch ON the appliance.
no:
B
Change NTC sensor.
B
Reconnect the boiler electrical connection.
B
Switch ON the appliance.
Tab. 16 A7 Error codes
