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Symptom Possible cause Action
Low / no flow
(continued)
Water supply issue For Standard SmartValve - Ensure water is turned
fully on at the mains and at the servicing valve in
the supply.
Ensure isolation valves are fully open.
Restriction in the
waterway
See same cause in 'Pump noisy and low / no
flow' symptom.
Blocked or kinked
hose liner
Where a flexible hose is fitted, unscrew the
shower hose from the outlet connection and
turn the shower on.
Incoming mains water
pressure or flow too low
(Standard
SmartValve only)
After confirming that the filters are clear, check
with the local water authority.
Separate, stand alone
pump not activating
(Standard
SmartValve only)
Ensure sufficient flow to activate the flow
switches of the pump. Refer to IMPORTANT
INFORMATION section in the Smart Shower
Installation Guide.
SmartValve pump not
activating
Refer to Setting Water System Mode section in
the Smart Shower Installation Guide. Ensure
mode is set to Normal or ECO Gravity setting.
SmartValve
is set to ECO mode
Refer to Setting Water System Mode section in
the Smart Shower Installation Guide.
Unable to
adjust or control
temperature
Reversed inlet water
supplies (i.e. Hot
supply feeding cold
inlet and vice-versa)
Ensure correct water supply to specified inlet
connection of the SmartValve.
Fluctuating water
temperature
Incorrect setting
on Logic Module of
SmartValve
If hot water supply is from a combination boiler-
the Logic module mode MUST be set to COMBI.
Refer to Setting Water System Mode section in
the Smart Shower Installation Guide.
Airlock in water
supplies (for gravity fed
systems only)
See “Air lock” in Possible Cause section on
page 17.
Hot water temperature
too high
Ensure hot water supply temperature is below
65ºC (minimum 55ºC for stored water and 50ºC
for combination boilers).
Communications issue Check data cable connections and that there is
no visible damage.
Combination boiler
unable to meet
demand
Check if another outlet in the property is being
used at the same time.
Check that the hot water temperature is stable
at another high flowing outlet (e.g. bath hot
tap - run at maximum flow rate), additionally
run a cold outlet at 1/3 of a maximum flow rate.
If the same issue is evident on these outlets,
contact your boiler manufacturer.
Symptom Possible cause Action
Temperature
too low
Low hot water
temperature
Check that domestic hot water temperature is
a minimum of 55ºC for stored water and 50ºC
for combination boilers.
Logic Module
temperature setting
too low
Maximum temperature is set to a factory
default of 45ºC. To adjust refer to the important
information section (Safety Information) and
Controller Commissioning Instructions in the
Smart Shower Installation Guide.
Temperature too
low - Controller
temperature
ready display
does not stabilise
Hot water supply
issue
Check another hot water outlet to ensure that
hot water is available.
Mixed water supplies Water supplies MUST be from the same source:
MUST NOT be gravity hot and mains cold.
Unbalanced water
supplies
For mains fed systems the cold and hot feeds
should be as evenly balanced as possible -
especially for HP unvented systems.
Combination boiler
unable to meet
demand
See same cause in 'Fluctuating Water
Temperature' symptom.
Temperature too
hot
Seasonal conditions In the warmer months, the mains water
temperature can rise to ambient level. The
SmartValve always blends a mix of both
hot and cold supplies therefore the output
temperature at fully cold (controller setting)
will always be higher than the incoming cold
water supply.
Seasonal conditions
(gravity fed systems
only)
For installations which utilise a cold water
storage supply (gravity fed system), the
ambient temperature in the loft can rise to
above 40ºC. In turn, this warms the stored
water. Check by running a cold tap that is
supplied from the water storage. N.B. Kitchen
taps are normally fed from the mains water
system.
Maximum
temperature
setting is not to
your preference
Settings need
adjusting
Refer to section 'Temperature too low', possible
cause 'Logic module setting too low'.
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