Buderus 500 - 28/C Servicing Manual page 19

box 20 Display codes
z
Display
Key to display code
code
Fault:
C [2p]
The flow sensor has detected a temperature increase, in
the heating system water, of over 5 °C/sec.
Fault:
C [3a]
The tacho signal from the fan has failed during the
operating phase.
Fault:
?3l]
The tacho signal from the fan is not present during the pre-
operative or operating phase.
Fault:
?3l]
No current of air after a certain time.
Fault:
?3y]
The fan runs too slowly or too fast.
Fault:
?4a]
The flow sensor and safety sensor have detected a
CH flow temperature of over 105 °C.
Fault:
?4e]
The sensor test has failed.
Fault:
The contacts of the flow sensor and safety sensor are
?4l]
shorted to each other, or there is a short-circuit to earth
(ground), or the flow or safety sensor has detected a
CH flow temperature of above 130 °C.
Fault:
?4p]
The contacts of the flow sensor or safety sensor are
broken.
Fault:
C [6a]
During the ignition phase, the system has detected an
insufficient ionisation current.
Fault:
?6a]
After four startup attempts, the system has detected an
insufficient ionisation current.
Fault:
:6c]
The system has detected an ionisation current before
burner startup.
Fault:
?6c]
An ionisation current has been measured as soon as the
burner shuts down.
Fault:
C [6l]
The flame goes out during the operating phase.
Fault:
?7c]
The power supply was shut off during a crucial breakdown.
Operating phase:
!88|
Display test during startup phase:
The code is displayed for a maximum of 1 second.
Fault:
?9a]
The DBA control panel is defective.
Fault:
?9f]
The contacts of the gas valve have been broken.
Fault:
?9h]
The DBA control panel is defective.
Fault:
?9l]
The contacts of the gas valve have been broken.
Fault:
?9l]
The DBA control panel is defective.
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.
We reserve the right to make technical modifications
Servicing manual Gas condensing boiler Buderus 500-24/S, 500-24/C and 500-28/C • Issued 02/2006
Display indication
Reset
Other symptoms
required?
No
1)
No
1)
Yes No heating operation and no hot water.
2)
Yes No heating operation and no hot water.
2)
Yes No heating operation and no hot water.
2)
Yes No heating operation and no hot water.
2)
Yes No heating operation and no hot water.
2)
No heating operation and no hot water.
Yes
2)
Yes No heating operation and no hot water.
2)
No
1)
Yes No heating operation and no hot water.
2)
Yes No heating operation and no hot water.
2)
Yes No heating operation and no hot water.
2)
No
1)
Yes No heating operation and no hot water.
2)
Yes No heating operation and no hot water.
2)
Yes No heating operation and no hot water.
2)
Yes No heating operation and no hot water.
2)
Yes No heating operation and no hot water.
2)
Yes No heating operation and no hot water.
2)
Symptoms
Buderus Ltd. • http://www.buderus-domestic.co.uk
5
Diagnosis
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