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Code Display text Description Solution
A.02.55 Inval or miss SerNR Invalid or missing device serial num
ber
Contact your supplier.
A.03.17 Safety check Periodically safety check ongoing Safety check procedure active:
No action
10.1.3 Blocking
Tab.72 Blocking codes
Code Display text Description Solution
H.00.16 DHW sensor Open Domestic Hot Water tank tempera
ture sensor is either removed or
measures a temperature below
range
Domestic hot water temperature sensor open:
Sensor is not present
Incorrectly fitted sensor: check that the sensor
has been correctly fitted
Bad connection: check the wiring and connec
tors
Faulty sensor: replace the sensor
H.00.17 DHW sensor Closed Domestic Hot Water tank tempera
ture sensor is either shorted or
measures a temperature above
range
Domestic hot water temperature sensor short-
circuited:
Incorrectly fitted sensor: check that the sensor
has been correctly fitted
Bad connection: check the wiring and connec
tors
Faulty sensor: replace the sensor
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.01.00 Comm Error Communication Error occured Communication error with the security kernel:
Restart the boiler
Replace the CU-GH
H.01.06 Max Delta TH-TF Maximum difference between heat
exchanger temperature and flow
temperature
Maximum difference between heat exchanger
and flow temperature exceeded:
No flow or insufficient flow:
Check the circulation (direction, pump,
valves).
Check the water pressure.
Check the cleanliness of the heat exchanger.
Check that the installation has been de-aired.
Check water quality according to supplier's
specifications.
Sensor error:
Check that the sensors are operating correct
ly.
Check that the sensor has been fitted proper
ly.
10 Troubleshooting
70 7734324 - v.06 - 01102021
70


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