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Code
Display text
Description
Solution
H.00.70
TbufferTankClosed
Buffer Tank temperature sensor is
either shorted or measures a tem
perature above range
Buffer tank temperature sensor short-circuited:
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.00.71
TbufferTankTopOpen
Buffer Tank top temperature sensor
is either removed or measures a
temperature below range
Buffer tank top 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
H.00.72
TbufferTankTopClosed Buffer Tank top temperature sensor
is either shorted or measures a tem
perature above range
Buffer tank top 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.00.74
TBufferTankMissing
Buffer Tank temperature sensor was
expected but not detected
Buffer tank temperature sensor not detected:
Buffer tank temperature sensor is not connec
ted: Connect the sensor
Buffer tank temperature sensor is not connec
ted correctly: Connect the sensor correctly
Faulty sensor: replace the sensor
H.00.75
TBufferTankTop Miss
Buffer Tank Top temperature sensor
was expected but not detected
Buffer tank top temperature sensor not detected:
Buffer tank top temperature sensor is not con
nected: Connect the sensor
Buffer tank top temperature sensor is not con
nected correctly: Connect the sensor correctly
H.00.76
TcascadeFlow Open
Cascade Flow temperature sensor is
either removed or measures a tem
perature below range
Cascade flow 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
H.00.77
TcascadeFlow Closed
Cascade Flow temperature sensor is
either shorted or measures a tem
perature above range
Cascade flow temperature sensor short-circuited:
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.00.78
TcascadeFlow missing Cascade Flow temperature sensor
was expected but not detected
Cascade flow temperature sensor not detected:
Cascade flow temperature sensor is not con
nected: Connect the sensor
Cascade flow temperature sensor is not con
nected correctly: Connect the sensor correctly
Faulty sensor: replace the sensor
H.01.00
Comm Error
Communication Error occured
Communication error with the security kernel:
Restart the boiler
Replace the CU-GH
12 Troubleshooting
7762666 - v.02 - 29092020
C 340 / C 640
163