Buderus Logamax plus Manuel utilisateur
Only for authorized service
technician !
Service Manual Gas Wallhung Boiler
Logamax plus
6 720 641 705-00.1O
GB012 - 25K
2011/10 EN - U. Demir
Content
GB012 - 25K
2
Content
1 Safety precautions and symbols . . . . . . . . . . . . . . . 3
1.1 Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Safety precautions . . . . . . . . . . . . . . . . . . . . . 3
2 Service Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Display Symbols . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Service Function . . . . . . . . . . . . . . . . . . . . . . 4
2.3 Service Function Overview . . . . . . . . . . . . . . 5
2.3.1 1. Service Level . . . . . . . . . . . . . . . . . . . . . . . 5
2.3.2 2. Service Level . . . . . . . . . . . . . . . . . . . . . . . 6
3 Failures / Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Elimination of errrors . . . . . . . . . . . . . . . . . . . 7
3.2 Failure / Error Codes Overview . . . . . . . . . . . 8
3.3 Failure codes and corrections steps . . . . . . . 9
3.4 Sensor (NTC) Values . . . . . . . . . . . . . . . . . . 25
3.4.1 Flow Temperature Sensor . . . . . . . . . . . . . . 25
3.4.2 Domestic Hot Water Temperature Sensor . . 25
3.4.3 Flue Gas Safety Temperature Sensor (Behind
Burner) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3.5 Electrical Datas . . . . . . . . . . . . . . . . . . . . . . 26
3.6 Electrical Circuit Diagram . . . . . . . . . . . . . . . 27
3.7 Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.8 Function Diagram . . . . . . . . . . . . . . . . . . . . . 31
4 Gas Values (Cental heating and domestic
hot water circuit) 32
1
Safety precautions and symbols
GB012 - 25K 3
1 Safety precautions and symbols
1.1 Symbols
Signal words indicate the seriousness of the hazard in terms
of the consequences of not following the safety instructions.
•Caution indicates that minor damage to property could
result.
•Warning indicates that minor personal injury or serious
damage to property could result.
•Danger indicates that serious personal injury could result.
In particularly serious cases, lives could be at risk.
Notes contain important information in cases where there is
no risk of personal injury or damage to property.
1.2 Safety precautions
If you smell gas
BTurn off gas service cook.
BOpen windows.
BDo not operate any electrical switches.
BExtinguish any naked flames.
BLeave the building and telephone the gas company and
authorized dealer from an outside phone.
If you smell fumes from the appliance
BSwitch off the appliance.
BOpen windows and doors.
BInform your heating engineer.
Fitting and Modifications
BFitting of the appliance or many modifications to be appli-
ance may only be carried out by a compotent perEND.
BFlue systens must not be modified in any way.
BIf the appliance has a type B.. flue system : Ventilation
openings in doors, windows and walls must not be sealed
or restricted. If draught-proof windows are installed, meas-
ures must be taken to ensure there is an adequate supply
of air to the appliance for combustion.
Inspection / Maintenance
BWe recommend take out a to have the system regulary
serviced in order to ensure that it functions reliably and
safely.
BOnly use original spare parts.
Combustible materials
BDo not store or use any combustible materials (paper, thin-
ners, paints etc.) in the vicinty of the appliance.
Combustion Air / Ambient Air
BKeep combustion air/ambient air free of corrosive sub-
stances (e. g. halogenated hydrocarbons which contain
chlorine or fluorine compounds). In this way corrosion can
be prevented.
Instructions to the customer
BExplain to the customer how the appliance works and how
to operate it.
BAdvise the customer that he / she must not make any mod-
ifications to the appliance or carry out any repairs on it.
Safety instructions in this document are identi-
fied by a warning-triangle symbol and are print-
ed on a grey background.
Notes are identified by the symbol shown on
the left. They are bordered by horizontal lines
above and below the text.
2Service Functions
GB012 - 25K
4
2 Service Functions
2.1 Display Symbols 2.2 Service Function
Service functions are in divided in 2 level :
•1. Level (see page 5)
•2. Level (see page 6)
Fig. 1
1Stand by (On/off) Button
2„Up (+)“ Button
3„Down (-)“ Button
4Temparature Display (°C)
5Mode Button
Symbol Description
Save a parameter in service
mode
Air bleeding function is active
(service function : 1.2.C)
MAP (fan speed) (service func-
tion : 2.b.d).
Siphon filling mode is active.
Domestic hot water circuit is
active.
Key lock is active.
Summer mode.
Tab. 1
mode
1
0
23
4
bar
45
2
3
6 720 643 530-26.1O
1
2
Service Functions
GB012 - 25K 5
2.3 Service Function Overview
2.3.1 1. Service Level
Operation
Change or query of a service function :
BPress mode, “+”and “-”button for 5 second. The service
function will be shown on Display (e.g. 1.2.C).
BSelect the desired/requested service code with “+” or “-”
button.
BPress mode button again (for entering).
After that you will see the selected (default) value on
Display.
Changing / Adjustment of Value:
BChange the values with “+” or “-” button.
Storage/Save of Value :
BPress mode button until [ ] symbol will be shown on
Display.
Exit from Service Level :
BFor the exit from service level press the mode, “+”and “-”
button for 5 second or Stand by button.
The flow temperature will be shown again on display.
1. Level
Service Code Description Range Initial (Factory
setting)
1.2.C Automatical Air Purging (0 = offý, 1= active ) Total time : 2 min.
and 20 sec on/off intervall
0 - 1 0
1.2.F Operating Mode : (0 = Normal, 3= min. output, 4 = max. output) 0, 3 , 4 0
1.3.b Burner Anticycling 1 - 10 min. 3 min.
1.3.C Burner start hysterisis (for flow temp. NTC) 0 - 10 K 5 K
1.5.b Fan overrun 1 - 18 (x10) sec. 3 (=30 sec.)
1.6.A Last failure on memory 00 - FF -
1.6.d Display actual water flow rate by turbine ( l/min. ) 0 - 99
1.7.A LCD Backligth (1 = on, 0 = off) 0 - 1 1
Tab. 2 1. level service functions
2Service Functions
GB012 - 25K
6
2.3.2 2. Service Level
Operating
Change or query of a service function :
BTo enter to 2. service level must be entered first in 1.
level.
Press mode, “+”and “-”button for 5 second. The service
function onf1. level will be shown on Display (e.g.
1.2.C).
BTo enter to 2. level : Press both “+” and “-” buttons for 3
second. The service function of 2. level will be shown on
Display (e.g. 2.1.A).
BSelect the desired/requested service code with “+” or “-”
button.
BPress mode button again (for entering).
After that you will see the selected (default) value on
Display.
Changing / Adjustment of Value:
BChange the values with “+” or “-” button.
Storage/Save of Value :
BPress mode button until [ ] symbol will be shown on
Display.
Exit from Service level :
BFor the exit from service level press the mode, “+”and “-”
button for 5 second or Stand by button.
The flow temperature will be shown again on display.
2. Level
Service
Code Description Range Initial (Factory Setting)
2.1.A CH max. heat output 30 - 100 % 100 %
2.1.b DHW max. heat output (in winter mode) 30 - 100 % 100 %
2.2.b CH max flow temperature 35 - 82 °C 82 °C
2.3.d CH min. heat output 30 - 100 % 30 %
2.8.A Software version number e.g.. 162 112 -
2.8.E Reset to factory (default) setting 0 0
2.9.A Operation mode permanent : (0 = Normal, 1= min. power, 2 = max.
power)
0 - 2 0
2.9.E Delay time for the turbine ( each unit = 0,5 sec.) 1 - 6 2
2.9.F Pump over run) (CH circuit) 0 - 10 min. 3
2.A.A Actual flow temperature ºC -
2.A.b Actual DHW temperatur ºC -
2.A.F Actual combustion chamber temperature ºC -
2.b.d Selection of flue length (MAP Value) (0 = off, 1 - 10 : fan speed accord-
ing flue pipe length, see flue manuel for details)
0 - 10 0
2.b.F Solar mode delay time (sec.) 1 - 50 1
2.c.F Pump "over run” (DHW mode) ???? 0 - 30 sec. 5 sec.
2.0.A Gas Convertion (0 = NG, 1 = LPG) 0 -1 0
Tab. 3 2. level service functions
3
Failures / Errors
GB012 - 25K 7
3 Failures / Errors
3.1 Elimination of errrors
All regulation, control and safety equipment of
appliance is controlled by the control unit.
If any failure during operation occurs, symbol and
maybe will start to flash also. In additional the failure
code will be shown on display (e.g. EA).
If and symbol on display flash:
BFor the reset : Press mode and ”-” button until
and symbol expire on display.
The appliance will start up again and the flow
temperature will be displayed.
If only symbol flashes:
BSwitch the appliance first off and then on again by
means of the standby key.
The appliance will start up again and the flow
temperature will be displayed.
If a failure can not be eliminated :
BContact your approved installer or Customer Service
for assistance, providing details of the fault and the
appliance.
DANGER: Explosion !
BTurn off gas cock before working on
gasbearing components.
BCheck for leaks before working on
gasbearing components.
DANGER: Poisoning !
BCheck for leaks before working on
gasbearing components.
DANGER: Risk of electric shock !
BAlways disconnect the power supply to
the appliance at the mains before
carrying out any work on the electrical
systems and components (fuse, circuit
breaker).
NOTICE: Leaking water may damage the
Cotronic module.
BCover the Cotronic module before
working on any parts that carry water.
For an overview of faults, see page 7.
3Failures / Errors
GB012 - 25K
8
3.2 Failure / Error Codes Overview
Failure
Code on
Display Failure Descripton Steps
MAP not selected (Fan speed adjustment
according the flue pipe length).
Check the adjustment /selection via service func-
tion 2.b.d).
1H Combustion chamber NTC failure (behind
burner) : - when the temperature by CC NTC
reached to limit or
- when NTC not detected or open circuit
Check the and the heat exchanger surface,
whether is blocked or not. And check the sensor
and the connections.
2P Gradient limit : Temperature rises too rapidly
in heating mode.
Check the pump, system pressure and by-pass
circuit.
3A Fan sensor not detected. Check the fan.
3C Fan speed can not reached to target speed. Check the fan for the blockage and the electrical
supply.
4C Overheat lock-out by temperatur limiters
(STBs) (Flue gas + prim. Heatexchanger). In
this case ; Heat demands is blocked and
pump stops 3 min. later.
Check the system presseure, temperature sensor,
pump and fuses on board. Discharge the air in
system. Check also the flue gas pipe and heatex-
changer.
4Y Flow temperature sensor failure (pump is run-
ning).
Check the flow temperature sensor and the con-
nection.
6A Ignition lock-out (flame not detected) (pump is
running).
Check the gas cock, gas pressure, electrode and
the cable connection.
6C Safety valve leaks. Check the gas valve, the cable connection and
electrode set.
B3 Short circuit / failure in water level switch. Check the condensate water drain and recuperator
(condens-heatexchanger).
CL Domestic hot water temperature sensor not
correct installed or failure.
Check the sensor and cable connection.
d7 Modulator coil failure (regulator valve on gas
valve)
Check the cable connection.
Tab. 4 Failure codes
3
Failures / Errors
GB012 - 25K 9
3.3 Failure codes and corrections steps
4Cis flashing.
Overheat lock-out by temperatur limiters (2 x STB : Flue gas + prim. Heatexchanger). In this case ; Heat
demands is blocked and pump stops 3 minutes later.
Control Step Action
1. Is the system pressure between 1 - 2
bar?
yes: -->2.
no: BFill water in sysytem.
BBleed the system 1).
BPress RESET button and restart again.
4C failure still exist? -->2.
2. Is the circulation pump blocked ? yes: BEliminate the blockage (turn the shaft).
If not succesful :
BSwitch off the appliance.
BCut mains supply.
BDrain the water from appliance.
BChange the pump.
BFill with water and bleed the system again.
BConnect to main supply.
BSwitch on the appliance.
BPress RESET button and restart again.
4C failure still exist? -->3.
no: -->3.
3. Check the flue gas pipe line.
Is there any blockage ?
yes: BCheck the flue gas pipe and remove the block-
age.
BSwitch on the appliance.
BCihazý resetleyip yeniden çalýþtýrýn.
4C failure still exist? -->4.
no: -->4.
4. Check the recuperator.
Is there any blockage?
yes: BClean the recuperator. Replace if necessary.
BSwitch on the appliance.
BPress RESET button and restart again.
4C failure still exist? -->5.
no: -->5.
5. BSwitch off the appliance.
BCheck the temperature limiter
(STB) on recuperator.
Ist the circuit open or wrong
installed ?
no: -->6.
yes: BChange the temperature limiter (STB) or correct
the installation.
BSwitch on the appliance.
-->6.
3Failures / Errors
GB012 - 25K
10
6. Electronic card is defect. BSwitch off the appliance.
BCut mains supply.
BChange the electronic card.
BConnect to main supply.
BSwitch on the appliance.
BEND
1) If the air inside not removed/discharged, can be also used the manuel air vent valve in recuparator.
4Cis flashing.
Overheat lock-out by temperatur limiters (2 x STB : Flue gas + prim. Heatexchanger). In this case ; Heat
demands is blocked and pump stops 3 minutes later.
Control Step Action
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