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Possible Cause 3:
Insuffi
cient fl ow. The heater will display a ‘noFL’ alarm
message in the upper (red) display window when the heater has detected that
the fl ow rate has dropped below the minimum level or stopped completely.
If using a cartridge fi lter:
Confi rm this by running the system with the
cartridge removed from your pump & fi lter unit, this will supply the heater
with the maximum fl ow rate your unit is capable of. If the heater then
switches ’On’ (ie: red light ’On’) a blocked cartridge can be confi rmed to be
the cause. The cartridge should be cleaned or replaced.
If using a sand fi lter:
Check the pressure indicator on your sand fi lter and
back wash if necessary.
Note: In some cases the ‘Thermal safety cut-out’ tripping and a low
fl ow rate can be linked ie: when a fi lter becomes choked air can be
drawn into the fi ltration system and become trapped inside the
heater so causing the thermostat to trip.
Quick Function Test
Observe the property’s main electricity meter when the heater is on (i.e.
Red Heating indicator is illuminated) and then observe it again when
the heater is in standby mode. The test should show that the meter is
recording more electricity being used by the heater when the Heating
indicator is illuminated. It is impossible for an electric heater to waste
energy, if it is drawing power then that power will be turned into heat that
will be transferred to the water.
Accurate Function Test
If a more accurate test is required to confi rm that your heater is delivering
the specifi ed heat output, two electricity meter readings will need to be
taken from the property’s main electricity meter, with an exact one hour
interval (i.e. take one meter reading and then a second reading exactly one
hour later). Then by subtracting the fi rst reading from the second reading
the number of units (kilo watts kW) consumed can be calculated. Note that
your heater is also rated in kW hours. The pool pump and heater will need
to be running continuously during the test (i.e. with the Heating indicator
illuminated).
