18
Action
Check that the supplies
correspond with the inlet
markings
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
Symptom
Water output is either all hot or
all cold, or cold only
Possible cause
Reversed inlet supplies
Check that the pipe work is laid
out in accordance with correct
practices, paying particular
attention to potential air-traps
If the static water pressure
exceeds 10 bar, install a pressure
reducing valve (PRV) in
accordance with the installation
guide
Airlock in the hot water
supply
Water temperature swings
regularly between hot and cold
Flow rate is poor and water
temperature is low
Cold water pressure is too high
Poor flow rate
Twisted hose
Debris in shower head
Debris in filters
Check for debris and clear as
necessary
The temperature of the hot
water cylinder is too low
Water output is not hot
enough
The cylinder temperature
should be at least 15˚C
hotter than the blend
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)
Trouble shooting guide
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