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Code Faults Description Checking / solution
D18 ST.TANK S.FAIL Solar tank sensor fault Bad connection
4Check whether the sensor is connected: ¼See
chapter: "Deletion of sensors from the memory in
the PCB", page 62
4Check the link and the connectors
4Check that the sensor has been correctly fitted
Sensor fault
4Check the Ohmic value of the sensor
4Replace the sensor if necessary
D19 SOL.COL.S.FAIL Header sensor fault Bad connection
4Check whether the sensor is connected: ¼See
chapter: "Deletion of sensors from the memory in
the PCB", page 62
4Check the link and the connectors
4Check that the sensor has been correctly fitted
Sensor fault
4Check the Ohmic value of the sensor
4Replace the sensor if necessary
D20 SOL COM.FAIL 4Switch the boiler off and switch back on
4Check whether the solar module is switched on. If necessary, replace the fuse ¼Refer to
the installation, commissioning and service manual for the DHW tank
4Check the connection between the SCU-C and the solar module
D50 DEF.COM.OTH Break in communication between
the iSense Pro module and the
boiler control panel.
4Check the wiring between the iSense Pro module and the
control panel
4Check that the CONFIGURATION parameter in the
#SYSTEM menu is set to OTH+3WV
D51 DEF XX:SEE BOIL. An error is displayed on the boiler
control panel.
4Refer to the boiler’s installation and service manual.
7.4.1. Deletion of sensors from the memory in the
PCB
The configuration of the sensors is memorised by the PCB. If a
sensor fault appears whilst the corresponding sensor is not
connected or has been voluntarily removed, please delete the sensor
from the PCB memory.
4Press key ? repeatedly until Do you want to delete this
sensor? is displayed.
4Select YES by turning the rotary button and press to confirm.
A defective outside temperature sensor cannot be deleted
from the SCU PCB.
iSense Pro DIN - AD280 7. Troubleshooting
22/11/2012 - 300025649-001-01 62
63


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