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Troubleshooting
Symptom
Partially closed isolation valve.
Instantaneous water heater cycles on and
off as flow rate or pressure is too low.
No flow or
Are the water supply pressures balanced?
low flow
rate
Hot or cold water being drawn off else-
where causing pressure changes or instan-
taneous boiler temperature changes.
Airlock or partial blockage in the
Hot/Cold water supply has failed
Maximum Water Temperature
Installation conditions outside
Outlet
Hot water temperature is less than 10°C
Water
above the required blend temperature
Tempera-
ture too
Hot/Cold
Instantaneous water not igniting because
the water flow rate is too low.
Instantaneous water not igniting because
Only
Inlet water supplies are reversed.
hot/cold
water from
Shower
Valve
This is normal for a short time after
Water
dripping
from
shower
Shower
does not
Mains water supply turned off.
turn on
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Cause
Head of water is below the
minimum distance required.
supply pipework.
needs adjusting.
Filter/pipe blockage
operating parameters.
the water pressure is too low.
Filter/pipe blockage
using the shower.
If water continues to drip,
possibly due to the cartridge
Closed isolation valve.
Remedy
Open isolation valve.
Increase water flow rate or
pressure through system.
Refer to the specification for the
minimum distance required.
If pressures are unbalanced, a pressure
reducing valve should be used for
optimum performance.
Do not use other water outlets when
using the shower.
Flush through pipework and filters to ensure
removal of debris and any airlocks.
Check the hot and cold feeds. The shower
will not work if either fails.
Refer to the Temperature Setting section to
set your desired maximum temperature.
Flush through pipework and filters to ensure
removal of debris and any airlocks.
Refer to the specification for the
minimum distance required.
Adjust hot water temperature or wait
for water to reheat if a stored water
system is used.
Increase water flow rate through the system.
Refer to the Maintenance section to clean/
check the cartridge and filters for any
damage. Contact your boiler manufacturer.
Refer to the specification for system
requirements. Increase water pressure
through the system.
Contact your boiler manufacturer.
Check the water inlet connections are the
correct way around: Hot on the left, Cold on
the right when viewed from the front.
Rework pipework as necessary.
Flush through pipework and filters to ensure
removal of debris and any airlocks.
This is caused by residual water tension,
the build up of water in the shower.
Remove cartridge and clean, refer to
'Maintenance' section before starting
any maintenance.
Open isolation valve.
Turn on mains water supply.
17
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Table of Contents
Troubleshooting
