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Trouble shooting
Heating Device will not switch on
In most cases this will be the result of one of the following not being met:
Possible Cause 1.) The required temperature has been reached.
To confirm the controller is requesting the heating device to switch on check
that the required temperature is at least 0.6⁰C greater than the current water
temperature and that the red thermometer in the display is ‘animated’ showing
the thermometer increasing
Possible Cause 2.) Insufficient Flow.
The display will show ‘NO FLOW’ if the flow switch has detected that the flow
volume is below 4,000-litres per hour (4m³/h).
Check that the flow volume is greater than 4,000-litres per hour and that the
flow switch is in the correct orientation to sense flow (i.e. check that the arrow
moulded into the flow switch body is facing in the same direction as the flow
travelling through the T-Piece).
Possible Cause 3.) The controller is in a timed off period.
Check if the controller has the ‘TIMER’ symbol displayed – if it does check
your clock and time period settings (explained in the set up section).
Possible Cause 4.) The heat output has not been correctly connected to the
control circuit of your heating device.
Check the wiring diagram for verification on how the controller should be con-
nected to the heating device and seek the expertise of a qualified electrician if
in any doubt.
Possible Cause 5.) The controller is in time delay mode.
If the display is showing ‘HEATER DELAY’ the controller is in time delay mode.
This is activated if the controller is requesting the heating device to switch on
more than once in a 2-minute period – this can be caused by a fluctuating flow
rate (just above and then just below the 4,000-litre per hour requirement) or
fluctuations in water temperature.
To rectify check the plumbing for any restrictions to flow and increase the flow
volume through the T-Piece. Also check the positioning of the temperature
sensor, it should be positioned before the heating appliance.
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