Buderus Logamax plus GB162-80 kW Service Instructions Manual page 23

section 29 Display codes and other symptoms
Main Sub-
z z
display display
code code
e e
[0/c/\| [2/8/3|
1)
e e
[0/e/\| [2/6/5|
1)
e e
[0/h/\| [2/0/3|
1)
e e
[0/l/\| [2/8/4|
1)
e e
[0/u/\| [2/7/0|
1)
e e
[0/y/\| [2/0/4|
1)
e e
[0/y/\| [2/7/6|
e e
[0/y/\| [2/7/7|
Logamax plus GB162-80 kW/100 kW - Subject to modifications resulting from technical improvements!
Display code
z
Meaning
Operating code:The heating boiler prepares
for a burner start-up whenever a heat demand
has occurred. The fan unit (section 1, [22]) and
the pump are started.
The glow ignitor (section 1, [29]) is activated.
Operating code: The time-proportional pro-
gram is activated.
The time-proportional program is activated as
soon as the required modulating control per-
formance is lower than the bottom limit of the
device performance.
During the time-proportional program the
burner (section 1, [4]) is switched on and off
repeatedly during a period of 10 minutes. The
period in which the burner is switched on
depends on the difference between the
required performance of the modulating con-
trol and the lower limit of the device perfor-
mance. As soon as the burner has been
switched on, the boiler runs at minimum
capacity and the display of the control panel
(section 1, [4]) shows [-/h/\|.
As soon as the burner is switched off, the oper-
ating code [0/e/\| is indicated in the display.
Example: The device performance is 25 kW,
the bottom limit of the device performance is at
20 % and the required modulating control per-
formance is 5 %. This means that the burning
time is then a quarter of the total time frame of
10 minutes, i.e. the burning time is 2.5 min-
utes. The Off time is then 10 min. - 2.5 min. =
7.5 min.
Operating code: The boiler is in standby
mode. No heat demand is created.
Operating code: The gas valve (section 1,
[21]) is activated.
Operating code: The boiler starts up after
activation of the mains power supply or com-
pletion of a system reset.
Start of the water-side supply check:
The pump will carry out max. 4 attempts to
restore the water flow.
Start of air-side pre-purging phase:
The fan (section 1, [20]) runs for 15 seconds at
about 60 % of its maximum speed (applies to
all Logamax plus GB162 devices).
This code is displayed for a maximum of
4 minutes.
Operating code: The supply temperature
sensor (section 1, [24]) has detected that the
current heating-system supply temperature is
higher than the temperature entered at the
control panel (section 1, [4]), or that it is higher
than the heating-system supply temperature
calculated according to the heating curve, or
that it is higher than the heating-system supply
temperature calculated for DHW mode.
e
Blocking fault code: The supply temperature
sensor (section 1, [24]) has measured a cur-
rent heating supply temperature higher than
203 °F (95 °C).
e
Blocking fault code: The safety temperature
sensor (section 1, [28]) has measured a cur-
rent supply temperature higher than 203 °F
(95 °C).
LED on Other symptoms
UBA 3
Reset
required?
Off
Off
Off
Off
Off
Off The target room temperature
possibly is not reached.
No Off The target room temperature
possibly is not reached.
5) 7)
Possibly no DHW operation.
No Off The target room temperature
possibly is not reached.
5) 7)
Possibly no DHW operation.
Symptoms 5
Diagnosis
→
section 36
→
section 37
→
section 37
23