Fault Finding - gledhill TEC140-OV Installation & Servicing Instructions Manual

SERVICING AND MAINTENANCE
UNSATISFACTORY
HOT WATER
PERFORMANCE
Is the boiler
thermostat
set to max?
NO
Adjust boiler
thermostat to
maximum
Report to the
boiler
manufacturer
Descaling
of the PHE
required
YES
Is heat
exchanger
scaled up
internally?
(Indicated by
reduction of
ow rate)

FAULT FINDING

Is the power supply
to the PHE controller
switched on
YES
Is the model
YES
suitable for the
hot water
requirement?
YES
Is the Torrent
thermostat set
too low?
YES
Correct Torrent
thermostat setting
(set to 75ºC)
Is the boiler
NO
thermostat
adjustable?
YES
Adjust to
maximum
NO
Alter pipe
sizes
NO
Switch it on
Change for
NO
correct
model
Is the boiler
NO
output at least
10% more than the
rad. loading?
YES
Does the boiler
ow reach
temperature?
NO
YES
Does the temp
rise across the
boiler exceed 11°C
NO
H.W. ow too
great?
YES
Regulate ow
from outlet tting
(tap)
Is the circuit
NO
correctly sized?
YES
Investigate for
blockage
YES
Page 42
Follow the
fault nding
chart
Change boiler
NO
for larger
model
YES
Increase boiler
pump setting
Is the temp.
NO
rise too high?
YES
Is air
trapped in
the primary
circuit?
NO
YES
Fit an air vent
Is the temp.
NO
rise now
satisfactory?