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Code
Display text
Description
Solution
A.10.47
RoomTempZoneC miss Measure of Room Temperature
Zone C is missing
Room temperature sensor not detected in zone
C:
Room temperature sensor is not connected:
connect the sensor
Room temperature sensor is not connected
correctly: connect the sensor correctly
Faulty sensor: replace the sensor
A.10.50
T_DHW top D miss
Domestic Hot Water temperature
sensor top zone DHW is missing
Domestic hot water temperature sensor not de
tected in zone DHW:
Domestic hot water temperature sensor is not
connected: connect the sensor
Domestic hot water temperature sensor is not
connected correctly: connect the sensor cor
rectly
Faulty sensor: replace the sensor
A.10.54
Temp. Zone DHW
miss.
Temperature sensor Zone DHW is
missing
Temperature sensor not detected in zone DHW:
Temperature sensor is not connected: connect
the sensor
Temperature sensor is not connected correctly:
connect the sensor correctly
Faulty sensor: replace the sensor
A.10.56
T_DHW Zone AUX
miss
Domestic Hot Water temperature
sensor Zone AUX is missing
Domestic hot water temperature sensor not de
tected in zone AUX:
Domestic hot water temperature sensor is not
connected: connect the sensor
Domestic hot water temperature sensor is not
connected correctly: connect the sensor cor
rectly
Faulty sensor: replace the sensor
12.1.3 Blocking
Tab.130 Blocking codes
Code
Display text
Description
Solution
H.00.36
T 2nd Return Open
Second return temperature sensor is
either removed or measures a tem
perature below range
Second return temperature sensor open:
Bad connection: check the wiring and connec
tors.
Incorrectly fitted sensor: check that the sensor
has been correctly fitted.
Faulty sensor: replace the sensor.
H.00.37
T 2nd Return Closed
Second return temperature sensor is
either shorted or measures a tem
perature above range
Second return temperature sensor short-circuit
ed:
Bad connection: check the wiring and connec
tors.
Incorrectly fitted sensor: check that the sensor
has been correctly fitted.
Faulty sensor: replace the sensor.
H.00.69
TbufferTankOpen
Buffer Tank temperature sensor is
either removed or measures a tem
perature below range
Buffer tank temperature sensor open:
Bad connection: check the wiring and connec
tors
Incorrectly fitted sensor: check that the sensor
has been correctly fitted
Sensor is not present.
Faulty sensor: replace the sensor
12 Troubleshooting
162
C 340 / C 640
7762666 - v.02 - 29092020