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Code Display text Description Solution
A.02.80 Missing Cascade Ctrl Missing Cascade controller Cascade controller not found:
Reconnect the cascade master
Carry out an auto-detect
A.08.02 Shower Time Elapsed The time reserved for the shower
has elapsed
Adjust parameter DP357 to the desired shower
time.
10.1.3 Blocking
Tab.50 Blocking codes
Code Display text Description Solution
H.00.81 RoomTempMissing Room Temperature sensor was ex
pected but not detected
Room temperature sensor not detected:
Room temperature sensor is not connected:
Connect the sensor
Room temperature sensor is not connected
correctly: Connect the sensor correctly
H.01.00 Comm Error Communication Error occured Communication error with the security kernel:
Restart the boiler
Replace the CU-GH
H.01.05 Max Delta TF-TR Maximum difference between flow
temperature and return temperature
Maximum difference between the flow and return
temperature exceeded:
No flow or insufficient flow:
Check the flow (direction, pump, valves)
Check the water pressure
Check the cleanliness of the heat exchanger
Sensor error:
Check that the sensors are operating correct
ly
Check that the sensor has been fitted proper
ly
H.01.08 CH Temp Grad. Level3 Maximum CH temperature gradient
level3 exceeded
Maximum heat exchanger temperature increase
has been 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 central heating system has
been correctly vented to remove air
Sensor error:
Check that the sensors are operating correct
ly
Check that the sensor has been fitted proper
ly
H.01.09 Gas Pressure Switch Gas Pressure Switch Gas pressure too low:
No flow or insufficient flow:
Make sure that the gas valve is fully opened
Check the gas supply pressure
If a gas filter is present: Make sure that the
filter is clean
Wrong setting on the gas pressure switch:
Make sure that the switch has been fitted
properly
Replace the switch if necessary
10 Troubleshooting
58 7684359 - v.11 - 13122021
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