NOTES
26 27
Water output is
either all hot or all
cold, or cold only
Reverse inlet supplies
Check that the supplies
correspond with the inlet
markings
The cylinder temperature
should be at least 15ºC
hotter than the blend
Check the flow rate
recommendations with the
heater manufacturer.
If fitted to a combination
boiler adjust the flow
control knob on the mixer
valve to reduce flow until
a comfortable showering
or bathing temperature is
achieved
The temperature of the
hot water cylinder is too
low
Water flow through the
hot water appliance is
too fast
Water output is
not hot enough
Flow rate is poor
and water
temperature is
low
Check the pipework is laid
out in accordance with
correct practices, paying
particular attention to
potential air-traps
Airlock in the hot
water supply (gravity
or pumped systems
only)
Water temperature
swings regularly
between hot and
cold
Cold water pressure
is too high
If the static water pressure
exceeds 10 bar, install a
pressure reducing valve
(PRV) in accordance with
the installation guide
Poor flow rate Twisted hose
Debris in shower head
Debris in filters
Check for debris and clear
as necessary
SYMPTOM POSSIBLE CAUSE ACTION
Unbalanced supplies Check both sources are
equal pressures
TROUBLE SHOOTING GUIDE
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