23
LOGIC HIU
-
Installation & Servicing / Users
DIRECT
OPERATION
45 DISPLAYED ERROR CODES
Domestic water generation: DHW preheating
function
The function is enabled by setting dip switch 5 to the ON
position.
During periods when the domestic water cycle is not used,
if the DHW probe detects a temperature 10°C below the
SET value, the controller partially opens the domestic water
modulating valve for the time required (max. 5 mins) to bring
the temperature detected up to a value 5˚C below the set point
value.
44 DISPLAYED ERROR CODES
When an error occurs on these units, the unit will stop
functioning and display a RED light on the control box. At the
same time a number relating to this fault will be displayed.
Central Heating outlet temperature probe fault
If the heating probe fails, the heating will cease immediately.
The domestic water generation will not be affected. The probe
fault is indicated by a flashing fault LED on the electronic
controller and the fault code 5 will be displayed.
Domestic Hot water outlet temperature probe fault
If the domestic water temperature probe fails, domestic water
generation will cease immediately. Heating performance will
not be affected. The probe fault is indicated by a flashing fault
LED on the electronic controller and the fault code 6 will be
displayed.
Rectify these faults
– Replace the fault probes ensuring
the relevant heat demand is applied. If the fault does not
automatically reset, activate the reset button on the control
box. The system should now function as normal.
5
ON
