8 9
Maintenance & Service
Information
NOTE: After initial commissioning or
subsequent re-commissioning (service-
repair), check that the water supply has been
established prior to switching on the boiler.
The appliance should be periodically checked
for scale build-up.
In hard water areas, the boiler should be
descaled on a regular basis to maintain ef cient
operation, minimise energy consumption, and
also retain water quality. The frequency depends
upon hardness of the local mains water supply
and whether or not it is being treated by an
effective scale reducer (strongly recommended
– see below).
PREVENTION IS BETTER: Rather than
frequently de-scaling the machine it may be
preferable to install an effective scale reducer
or WRAS approved water softener to the mains
water supply. This will reduce the frequency of
de-scaling but may not remove scale completely
in some areas.
Multi-Filters (AQ35), spare parts and accessories
are available from Instanta Limited –
Tel: 01704 501114 and ask for spares
Descaling:
To de-scale the machine:
1. Safety Caution: First disconnect
machine from the power supply
2. Drain water down via the tap.
3. Remove the boiler-case (2 screws).
4. Drain the remaining water through the drain
plug in the bottom of the tank.
5. Remove the tank-lid by unscrewing the
xing screws, the tank is now accessible.
Lift out the baf e plates on the inside of the
tank (taking note of the position of the
plates).
6. Remove as much loose scale as possible
by hand.
7. Dissolve any scale that is dif cult to remove
using a suitable de-scaling solution.
Remember to replace the drain plug before
using the de-scaler.
8. Clean the level-sensing probes and their
white insulators completely, using a non-
metallic scourer.
9. Ensure all traces of de-scaler are removed
by ushing with copious amounts of fresh
water, before using the boiler again.
10. It is preferable to install an effective scale-
reducer or water softner. This will reduce
the frequency of de-scaling but will not
remove scale completely in some areas.
Draw-off Tap:
The draw-off tap components are subject to
wear & tear. We strongly recommend that the
tap is inspected periodically (at least once a year
as part of a general maintenance routine). It is
advisable to keep a spare tap spring and tap
washer in case of emergencies.
Tap Spring - TP1007/N
Tap Washer - TP1001/L
Tap Bonnet - HSTP100
Upper Tap Assembly - XTP1050/A
Service Warnings & Fault
Diagnostics
Your boiler is tted with an intelligent fault
diagnosing system. There are two levels of
diagnosis.
1 Simple warnings - illumination of an amber
exclamation mark. Your boiler will continue
to operate as normal whilst displaying these
warnings.
2 Critical faults - illumination of a red spanner.
Simple Warnings [1]:
The following messages may be displayed.
To clear, switch boiler off at the mains supply
and switch back on. These messages, which
are not critical, should be dealt with when it is
convenient:
“CHECK SUPPLY” Boiler has not sensed any
drop in temperature. The most common cause is
an interruption of the water supply. Check stop
valve and make sure there are no kinks in the
hose and no debris in the water inlet valve. The
message can also indicate low incoming water
pressure. Shortly after the water supply returns
to normal, the message will cease.
“CHECK FILLING” Boiler has not sensed water
on the bottom level sensor. Check water supply
to the boiler and make sure there are no kinks
in the hose and no debris in the water inlet
valve. Please note that in hard water areas this
message can be caused by lime-scale (see
message “CLEAN PROBES” below). Once
water supply returns or bottom probe has been
cleaned, the boiler must be switched off at the
mains and back on again to reset.
“CLEAN PROBES” [+ 1 or + 2]: Your boiler is
tted with ve level sensors. In some areas hard
water causes a build-up of lime-scale deposits
on the sensors which acts as an insulator.
When a sensor becomes insulated, the water
level switches to a different sensor and the
CLEAN PROBES message will display. This is
followed by a number 1 or 2. “CLEAN PROBES
1” indicates that the bottom and possibly
ECO sensor are coated in lime-scale, “CLEAN
PROBES 2” indicates that one of the top three
sensors is coated in scale.
To clean the probes refer to ‘Descaling’
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 O/C” The temperature sensor
has been disconnected or is faulty. Consult
with your supplier or phone Service/Technical
Support (01704 502911).
“OVERFILL” The boiler has sensed water on the
Over ll level sensor. Simply clean the probes
as above. If this does not resolve the fault, the
boiler has over lled. This may have been caused
by a faulty water inlet valve or very high or low
incoming water pressure. Consult with your
supplier or phone Service/Technical Support
(01704 502911).
“ELEMENT OR TRIP FAULT” This means
that either one of the two safety cut-outs has
activated or the element has failed.
1). Over-boil safety cut-out – This activates
if boiler produces excess steam. This
can be due to:
- lime-scale within the tank.
- overuse of the boiler, beyond its capacity.
- a temporary interruption in the water
supply.
- a faulty temperature sensor or internal
component (triac).
2). Boil-dry safety cut-out – This activates
if the boiler has been boiled dry, for
example, due to lime-scale build-up or
water starvation.
To reset boiler safety controls;
The safety cut-outs are manually resettable
Safety Caution: Isolate boiler from
power supply before proceeding.
- Isolate from mains electrical power.
- Remove outer case (2 screws top &
bottom).
- Over-Boil Safety: Push the small reset
button in the centre of the safety cut-out
switch (located next to the water inlet
valve).
- Boil-dry Safety: Push the small reset
button in the centre of the heating element
(located left-side of tank).
If in any doubt, do not attempt just contact
our Service/Technical Support department on
01704 502911
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