12 Troubleshooting
12.1 Error codes
The boiler is fitted with an electronic regulation and control unit. The heart
of the control is a microprocessor, which controls and also protects the
boiler. In the event of an error, a corresponding code is displayed.
Tab.128 Error codes are displayed at three different levels
Code
Type
Description
Warning
The boiler continues to operate but the cause of the warning must be investigated. A
warning can change into a blocking or lock-out.
H00.00
Blocking
The boiler starts up again automatically when the cause of the blocking has been recti
fied. A blocking can become a lock-out.
Lock out
The boiler starts up again only when the cause of the lock-out has been rectified and
reset manually.
(1) The first letter indicates the type of error.
The meaning of the code can be found in the various error code tables.
Important
The error code is needed to find the cause of the error quickly and
correctly and for any support from De Dietrich.
12.1.1 Display of error codes
When an error occurs in the installation, the control panel shows:
1
The display will show a corresponding code and message.
2
The status LED of the control panel will show:
Continuous green = Normal operation
Flashing green = Warning
Continuous red = Blocking
Flashing red = Lock out
1. Press and hold the button to reset the boiler.
The boiler starts up again only when the cause of the error has
been rectified.
2. If the error code reappears, correct the problem by following the
instructions in the error code tables.
The error code remains visible until the problem is solved.
3. Note the error code when the problem cannot be solved.
12.1.2 Warning
Tab.129 Warning codes
Code
Display text
Description
Solution
A.00.32
TOutside Open
Outside temperature sensor is either
removed or measures a temperature
below range
Outdoor 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
A.00.33
TOutside Closed
Outside temperature sensor is either
shorted or measures a temperature
above range
Outdoor 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
Fig.146 Diematic Evolution
AD-3001379-01
Error Code: A.00.00
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Home Screen
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20/02/2018 16:51
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12 Troubleshooting
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C 340 / C 640
7762666 - v.02 - 29092020
