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SERVICING AND MAINTENANCE
FAULT FINDING
UNSATISFACTORY
HOT WATER
PERFORMANCE
Is the power supply
to the PHE controller
switched on
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
Switch it on
Follow the
fault finding
chart
Is the boiler
thermostat
set to max?
Is the model
suitable for the
hot water
requirement?
Change for
correct
model
Change boiler
for larger
model
Adjust boiler
thermostat to
maximum
Is the Torrent
thermostat set
too low?
Is the boiler
output at least
10% more than the
rad. loading?
Does the boiler
flow reach
temperature?
Is the boiler
thermostat
adjustable?
Correct Torrent
thermostat setting
(set to 75ºC)
Report to the
boiler
manufacturer
Adjust to
maximum
Descaling
of the PHE
required
Is heat
exchanger
scaled up
internally?
(Indicated by
reduction of
flow rate)
Alter pipe
sizes
Does the temp
rise across the
boiler exceed 11°C
Increase boiler
pump setting
H.W. flow too
great?
Is the temp.
rise too high?
Regulate flow
from outlet fitting
(tap)
Is the circuit
correctly sized?
Fit an air vent
Is the temp.
rise now
satisfactory?
Investigate for
blockage
Is air
trapped in
the primary
circuit?
