SIMPLE WARNINGS (1)
The following messages may be seen. The display will
alternate between the boiler status and the warning
message. To clear message, switch boiler off at the mains
supply and back on. These messages, which are not
critical, should be dealt with when it is convenient;
CHECK WATER Interruption in water supply. Check stop valve is turned
on and no kinks restricting inlet hose.
Check no debris in the water inlet valve.
Message can also indicate low in-coming mains water
pressure.
NO WATER
Can occur on initial installation or following a service/
maintenance.
Lower probe cannot sense water after 6 minutes.
Usually caused by interruption in water supply.
Check stop valve and inlet hose etc. (as above).
Fault can also be caused by limescale (see Message
CLEAN PROBES below). Once water supply is rectifi ed
or probes cleaned, boiler must be switched off and back
on to reset.
CLEAN PROBES
(+1 or +2)
Limescale build up on one or more of the 5 level
sensors.
(+1) indicates that the lower sensor is coated in scale
(+2) indicates that one of the upper 3 sensors are coated
in scale. Clean probes as described in “DE-SCALING”
above.
CRITICAL WARNINGS (2):
In the event of a serious malfunction, the Red spanner
in the display will illuminate together with the message
CALL SUPPLIER, alternating with one of the following
messages;
THERMISTOR OC Temperature sensor has become disconnected or is
faulty. Contact supplier.
HEAT/THERM FAIL Either the Over-boil or Boil-dry safety cut-outs have
activated. Switch boiler off and back on after 5 minutes.
If the Over-boil cut-out has operated, the boiler will reset
and work as normal.
If the Boil-dry cut-out has operated, the boiler will not
heat and the message will reoccur in about an hour.
OVERFILL Water level has risen to the highest Overfi ll sensor.
If a previous CLEAN PROBES message has been
ignored, simply clean the probes as described in
“DE-SCALING” above.
If this does not solve problem, the boiler has overfi lled.
This can be caused by a faulty water inlet valve or very
high or low incoming water pressure. Contact supplier.
The majority of possible faults have been covered
above. However, in certain circumstances, safety
controls within the boiler may be activated. There are
two resettable safety cut-outs in your boiler:
1). Over-boil safety cut-out: activates should the boiler
produce excess steam. This can be due to:
• Limescale within the tank
• A temporary interruption in the water supply
• Over use of the boiler, beyond its capacity
• A faulty temperature sensor (covered by
Warranty)
2). Boil-dry safety cut-out: this will activate if the boiler
has been boiled dry, for example due to lime-scale
build up or water starvation.
The safety cut-outs are manually resettable.
Safety First: Isolate from mains power
supply before resetting. If in doubt, fi rst
contact Instanta Service Department
on 01704 5029011
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