Replacing The Pcb; 11 Troubleshooting; Temporary And Permanent Faults; Error Codes - DeDietrich 24 Installation And Service Manual

10.4.5

Replacing the PCB

Fig.138
F1 F2

11 Troubleshooting

11.1

Temporary and permanent faults

There are two types of notices displayed: temporary or permanent. The first notice shown on the display is a letter followed by a
two-digit number. The letter indicates the type of fault: Temporary (A or H) or permanent (E). The number indicates the group in
which the fault that has occurred is classified according to its impact on safe and reliable operation. The second notice consists
of a two-digit number that indicates the type of fault which has occurred (see the following fault tables).
TEMPORARY FAULT (A/H.x.x.)
A temporary fault is shown on the display by the letter "A" or "H" followed by a number (group). A temporary fault is a type of
fault that does not cause a permanent stoppage of the boiler. It has the following characteristics:
A: The appliance continues to operate. It disappears as soon as the cause has been resolved.
H: Disappears when the error condition is removed, in some cases even after 10 minutes.
PERMANENT FAULT (E.x.x)
A permanent fault is shown on the display by the letter "E" followed by a number (group). Press the RESET key for 1 second. If
faults are shown frequently, contact a qualified technician.
E: Stoppage, RESET required.
11.2

Error codes

Tab.121 List of temporary faults
DISPLAY
DESCRIPTION OF TEMPORARY FAULTS
Group Specific
code code
H.00 .42 Pressure sensor open/faulty
H.01 .00 Temporary communication failure in the PCB
Maximum temperature difference value between flow
H.01 .05
and return reached.
7804841 - 02 - 20012022
F3 F4
BO-0000271
After replacing the main board, power up the boiler electrically.
Parameters CN1 and CN2 will automatically appear on the display.
Modify the parameters with the data shown on the serial number plate:
Press the F4 key to store the set value.
Use the keys F2 - F3 to modify the parameters;
Press the F4 key to store the set value.
Parameters CN1 and CN2 can also be accessed from the main menu to
carry out the replacement. Press the two external keys F1 - F4 on the
control panel simultaneously for about 40 seconds.
Caution
Please note that resetting the CN1 and CN2 settings with data on
the data plate deletes any previous setting. In case of a gas
change, for example, remember to set the correct calibration of
the gas valve and the fan speed.
CAUSE – Check/Solution
An installer is required for most checks and solu­
tions.
SENSOR/CONNECTION PROBLEM
Check the operation of the pressure sensor
Check the sensor/PCB connection
The error is resolved automatically
INSUFFICIENT CIRCULATION
Check the boiler/installation circulation
Activate a manual venting cycle
Check the installation pressure
OTHER CAUSES
Check the cleanliness of the exchanger
Check the operation of the temperature sensors
Check the temperature sensor connection
en
11 Troubleshooting
INIDENS 203