Buderus 500 - 24/C, Servicing Manual

Page: 20 / 80

Symptoms 5
We reserve the right to make technical modifications Buderus Ltd. • http://www.buderus-domestic.co.uk
20 Servicing manual Gas condensing boiler Buderus 500-24/S, 500-24/C and 500-28/C • Issued 02/2006
?9p]
Fault:
The DBA control panel is defective.
Yes
2)
No heating operation and no hot water. box 41
?9y]
Fault:
Short circuit in the gas valve.
Yes box 41
?ef]
Fault:
The contacts of the KIM (EEPROM on the DBA control
panel circuit board) may be loose or short-circuited.
No
1)
No heating operation and no hot water. box 41
?e1]
to
?e4]
?ea]
?ec]
Fault:
The DBA control panel is defective.
Yes
2)
No heating operation and no hot water. box 41
C [re]
Fault:
Reset is carried out.
This code appears after the reset button
B
is pressed for
5 seconds.
Applies only to a system-blocking error (flashing
display code)
box 20 Display codes
Display indication
z
Display
code
Key to display code
Reset
required?
Other symptoms Diagnosis
1) This error code may deactivate again automatically after a specific time (without reset). Heating and hot water are now available once more.
2) In the event of this malfunction, the pump is started up and remains in continuous operation in order to minimise the possibility of the heating system
freezing up.