Symptom Cause Remedy
Maximum water
temperature too hot or
cold.
Maximum water temperature set
incorrectly.
Reset maximum water
temperature. Refer to
‘Setting/Commissioning’
sections.
Outlet water
temperature too hot /
cold.
Inlet filter is partially blocked. Check insert filters for any
blockages and clean as
necessary.
Installation conditions outside
operating parameters.
Refer to Installation
Requirements (pages 08-10).
Service shower valve as
recommended. Refer to
maintenance section (page 17).
Water temperature too
cold – maximum water
temperature incorrectly
set.
Hot water temperature is less
than 10ºC above the required
blend temperature.
Adjust hot water temperature or
wait for water to reheat if stored
system is used.
Instantaneous water heater not
igniting because water flow rate
is too low.
Increase water flow rate through
the system.
Check cartridge inlet filters and
clean or replace. Refer to
maintenance section (page 17).
Contact the boiler manufacturer.
Instantaneous water heater not
igniting because water pressure
is to low.
Refer to General Information for
system requirements.
Increase water pressure
through system.
Contact the boiler manufacturer.
Only hot or cold water
from Thermostatic
Mixing Valve outlet.
Inlet water supplies are reversed
(hot to cold supply).
Check the connections are the
correct way round. Hot on the
left and cold on the right when
viewed from the front. Rework
pipework as necessary.
Inlet filter is partially blocked. Clean or replace, flush through
pipework before refitting.
Troubleshooting
20
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