Control Unit Blocking Codes - DeDietrich AMC 15 Installation And Service Manual

Code Text display
A02.49 Failed Init Node
A02.55 Inval or miss SerNR
A02.69 Fair mode active
A02.76 Memory full
A08.02 Shower Time Elapsed
Tab.81 CU-GH08 blocking codes
Code Text display
H00.81 RoomTempMissing
H01.00 Comm Error
H01.05 Max Delta TF-TR
H01.08 Delta T Max 3
H01.09 Gas Pressure Switch
7686707 - v.01 - 06092018
Description
Failed Initialising Node
Invalid or missing device serial
number
Fair mode active
The reserved space in memory for
custom parameters value is full. No
more user changed possible
The time reserved for the shower
has elapsed
11.1.2

Control unit blocking codes

Description
Room Temperature sensor was
expected but not detected
Communication Error occured
Maximum difference between flow
temperature and return temperature
Delta T Max 3
Gas Pressure Switch
Recommendation
SCB PCB not found:
Carry out an auto-detect
Contact your supplier.
Contact your supplier.
Configuration error:
Reset and
Replace the CU-GH08 control unit.
Take a shorter shower or adjust parameter
DP357.
Recommendation
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
Communication error with the security kernel:
Restart boiler
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
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 installation 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.
Gas pressure too low:
No flow or insufficient flow:
Check that the gas valve is fully opened
Check the gas supply pressure
Wrong setting on the GPS gas pressure switch:
Check whether the Gps switch is installed
correctly
Replace the Gps switch if necessary
11 Troubleshooting
(see boiler data plate).
AMC 115