Buderus Logamax plus GB142-24 Servicing Instructions page 26

6 Symptoms
Display code
z z
Main Sub-
display display
code code
e e
[a/0/1| [8/1/6|
e e
[a/0/1| [8/2/8|
e e
[a/0/2| [8/1/6|
e e
[c/0/\| [2/8/8|
e e
[c/0/\| [2/8/9|
e e
[c/a/\| [2/8/6|
e e
[c/u/\| [2/4/0|
e e
[c/y/\| [2/4/1|
e e
[e/\/\| [2/9/0|
+ any digit
or letter
e e
[e/\/\| [2/4/2|
to
+ any digit
or letter
[2/8/7|
[h/\/7|
e e
[h/\/7|
[r/e/\|
table 2 Display indications on the BC10 basic controller
1)
only visible using the service tool
2)
is being carried out
6.2 LED on the UBA 3
In addition to the display indication on the BC10 basic controller, there is a red LED on the UBA 3.
The meaning of this LED is explained in see table 3.
LED
Off
Flashing slowly (1 Hz)
Flashing fast (10 seconds)
On
table 3 LED on the UBA 3
26 Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
Symptoms
z
Key to display code
e
No communication with EMS.
e
Water pressure sensor.
e
No communication with BC10.
e
The UBA 3 has no connection to the
pressure sensor or there is a short circuit.
e
Short circuit in connection to pressure
sensor.
e
The return sensor has measured a
temperature higher than 221 °F (105 °C).
e
The return sensor is shorted.
e
The return sensor contact is interrupted.
e
The UBA 3 is defective.
e
KIM or UBA 3 is defective.
The heating system pressure is too low.
The heating system pressure is too low.
Reset is carried out. After pressing the
"Reset" button this code is displayed for
5 seconds.
Meaning
Normal operation
There is a boiler fault (locking fault).
During startup after replacing the KIM or the UBA 3.
During a fault in the UBA 3 or if the KIM is not recognized.
Type of Reset
Other
display required
symptoms
code ?
AS
The boiler no
longer gets heat
requests; the
heating system no
longer heats.
AS
AS
BC10 settings are
no longer taken
over by RCxx
devices.
VKS yes
No heating
operation and no
hot water.
VKS yes
VKS yes
VKS yes
BKS no
No heating
operation and
no hot water.
VKS yes
No heating
operation and
no hot water.
SC
SC
2)
ÜC
Diagnosis Remedy
EMS bus system Reset by switching
is overloaded. the heating system
on and off.
UBA 3/MC10 is
Inform the
defective.
BUDERUS
customer service
department if
necessary.
The digital water Replace the digital
pressure sensor water pressure
is defective. sensor.
Contact problem Check the BC10
at BC10 or BC10 connection.
is defective.
Replace the BC10
if necessary.
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