TROUBLE SHOOTING GUIDE
SYMPTOM POSSIBLE CAUSE ACTION
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
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 flow through the hot
water appliance is too fast
(If fitted on a combination
boiler)
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
33
UK
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