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SERVICE WARNING LIGHT (All Models except WB5E)
All models except WB5E have this facility. This light is designed to help you
discover the cause of any malfunction. If the circuit senses a problem, the
service light will flash a number of times and then pause and repeat this
sequence. Count the number of flashes between pauses and refer to the table
on the back cover. Some serious service problems will disable the boiler whist
less serious ones will allow you to continue to operate until a convenient time
arises for the fault to be rectified.
NUMBER OF
FLASHES
BETWEEN
PAUSES
MEANING ACTION
1 Constant
Water level sensor has scaled up
at normal level and machine has
filled to a higher level
Clean Sensing Probes
2
Operating level sensor has been
detected but lower level sensor
has not
Clean Sensing Probes
3
Overfill level sensor has been
detected but other sensors have
not
Clean Sensing Probes
4
Danger level sensor has been
detected and machine functions
have been shut down
Clean Sensing Probes
5
Thermistor or potentiometer have
failed
Call service department on
01704 502911
Quoting the Serial Number
6
Boiler has failed to fill in the
allotted time. Possible causes :-
1. Water supply turned off.
2. Water inlet valve has failed.
3. Blockage in water inlet pipe.
4. Pipe connecting inlet valve to
boiler has become detached.
5. Bottom sensor is scaled up
Check water supply
If in order call Instanta
service department quoting
the Serial Number
7
The temperature sensor
(thermistor) has become
disconnected or the heating
element(s) have failed.
Call service department on
01704 502911
Quoting the Serial Number
8 or 9
Fault on temperature sensor
(thermistor).
Call service department on
01704 502911
Quoting the Serial Number
10
Heating element(s) faulty . Call service department on
01704 502911
Quoting the Serial Number
11
The water supply has been
interrupted and the level has
Check water supply