Related Manuals for Buderus Logamax plus
Summary of Contents for Buderus Logamax plus
- Page 1 Service Manual Gas Wallhung Boiler Logamax plus Only for authorized service technician ! GB012 - 25K...
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Page 2: Table Of Contents
Content Content Safety precautions and symbols ....3 Symbols ......3 Safety precautions . -
Page 3: Safety Precautions And Symbols
Safety precautions and symbols Safety precautions and symbols Symbols Inspection / Maintenance B We recommend take out a to have the system regulary Safety instructions in this document are identi- serviced in order to ensure that it functions reliably and fied by a warning-triangle symbol and are print- safely. -
Page 4: Service Functions
Service Functions Service Functions Display Symbols Service Function Service functions are in divided in 2 level : Symbol Description • 1. Level (see page 5) Save a parameter in service • 2. Level (see page 6) mode Air bleeding function is active (service function : 1.2.C) MAP (fan speed) (service func- tion : 2.b.d). -
Page 5: Service Function Overview
Service Functions Service Function Overview Changing / Adjustment of Value: 2.3.1 1. Service Level B Change the values with “+” or “-” button. Operation Storage/Save of Value : Change or query of a service function : B Press mode button until [ ] symbol will be shown on B Press mode, “+”... -
Page 6: Service Level
Service Functions 2.3.2 2. Service Level B Press button again (for entering). Operating mode After that you will see the selected (default) value on Change or query of a service function : Display. B To enter to 2. service level must be entered first in 1. level. -
Page 7: Failures / Errors
Failures / Errors Failures / Errors Elimination of errrors DANGER: Explosion ! B Turn off gas cock before working on gasbearing components. B Check for leaks before working on gasbearing components. DANGER: Poisoning ! B Check for leaks before working on gasbearing components. -
Page 8: Failure / Error Codes Overview
Failures / Errors Failure / Error Codes Overview Failure Code on Display Failure Descripton Steps MAP not selected (Fan speed adjustment Check the adjustment /selection via service func- according the flue pipe length). tion 2.b.d). Combustion chamber NTC failure (behind Check the and the heat exchanger surface, burner) : - when the temperature by CC NTC whether is blocked or not. -
Page 9: Failure Codes And Corrections Steps
Failures / Errors Failure codes and corrections steps is 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 Is the system pressure between 1 - 2 yes:... - Page 10 Failures / Errors is 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 Electronic card is defect. B Switch off the appliance.
- Page 11 Failures / Errors is flashing. Ignition lock-out (flame not detected) (pump is running) Control Step Action Dose the burner flame can be seen? yes: -->6. -->2. Gas inlet cock open? yes: -->3. B Open the gas inlet cock. B Press RESET button and restart again. 6A failure still exist? -->3.
- Page 12 Failures / Errors is flashing. Ignition lock-out (flame not detected) (pump is running) Control Step Action Is the gas valve working ? yes: B Connect the cables. B Switch off the appliance. B Switch on the appliance. B Pull out the gas valve cables. B Press RESET button and restart again.
- Page 13 Failures / Errors is flashing. Ignition lock-out (flame not detected) (pump is running) Control Step Action Cable harness is damaged. B Switch off the appliance. B Cut mains supply. B Change the cable harness. B Connect to main supply. B Switch on the appliance. B Press RESET button and restart again.
- Page 14 Failures / Errors is flashing. Central heating flow temperature sensor failure (pump is running). Control Step Action Check if CH flow temperature sensor yes: B Check the connection terminal on NTC. (NTC) is damaged or not ? 4Y failure still exist ? -->2. B Switch off the appliance.
- Page 15 Failures / Errors is flashing. Cumbustion chamber temperature sensor is defect, not detected or overheating in cumbustion cham- ber (pump runs continuously) Control Step Action Check if combustion chamber NTC yes: B Check the cable connection. damaged or not and the position. 1H failure still exist ? -->2.
- Page 16 Failures / Errors is flashing. Cumbustion chamber temperature sensor is defect, not detected or overheating in cumbustion cham- ber (pump runs continuously) Control Step Action Check the burner gas pressure. Are yes: B Correct the gas pressure values. If not possible, the values OK ? change the gas valve.
- Page 17 Failures / Errors is flashing. DHW (Domestic Hot Water) NTC not installed correctly or defect. The appliance doesn’ t run in summer mode. It works in winter mode and shows the failure code with alternately. Control Step Action Check the DHW NTC whether it is cor- CL failure still exist ? -->2.
- Page 18 Failures / Errors is flashing. A fast temperature increase detected in central heating (CH) (> 2,7 K/sec). The appliances will be resetet automaticly, if the flow temp. < 40 ºC. Control Step Action B Check system pressure on yes: -->2. manome-ter.
- Page 19 Failures / Errors is flashing. Fan sensor not detected. (This failure only occurs if there is a sensor or the cable physical defect) Control Step Action Is th fan cables damaged ? yes: B Switch off the appliance. B Change the cables. B Switch on the appliance.
- Page 20 Failures / Errors is flashing. Target fan speed can not reached or blockage problem. Control Step Action Is the flue gas pipe blocked ? -->2. yes: B Switch off the appliance. B Clean the flue gas pipe. B Switch on the appliance. 3C failure still exist? -->2.
- Page 21 Failures / Errors is flashing. After switching off gas flame detected (even the safety valves are closed (leakege)) Control Step Action Gas valve is defect. B Switch off the appliance. B Change the gas valve. B Switch on the appliance. B Check the leakage.
- Page 22 Failures / Errors is flashing. Short circuit / failure in water level switch in recuperator (condens heat exchanger). Control Step Action Check the siphon line. yes: B Remove the blockage. B Switch on the appliance. Is there any blockage ? B3 failure still exist? -->2 -->2.
- Page 23 Failures / Errors is flashing. Appliance doesn’t modulate / Regulator valve problem (don’t regulate to max. position). Control Step Action Check if the regulator valve cable yes: B Change the cable harness or correct it. damaged or not and the connection. B Switch on the appliance.
- Page 24 Failures / Errors is flashing. MAP not selected (Fan speed adjustment according the flue pipe length) Attention : The appliance is delivered with MAP value “0” (service function : 2.b.d). In this condition the appliance doesn’t run. The “I I” symbol will be shown on display alternately. Control Step Action MAP value is according the flue gas...
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Page 25: Sensor (Ntc) Values
Failures / Errors Sensor (NTC) Values 3.4.1 Flow Temperature Sensor 3.4.3 Flue Gas Safety Temperature Sensor (Behind Burner) Temperature ( °C) Measure Tolerance Temperature ( °C) ± %10 Resistance (Ohm) Measure Tolerance 14 772 ± %10 Resistance (Ohm) 27 936 11 981 12 136 9 786... -
Page 26: Electrical Datas
Failures / Errors Electrical Datas Description Supply Voltage Remarks Value Tolerance Termperature Limiter 24 VDC Temp. Limit = 110 ºC 0 Ohm Pramiary HE Termperature Limiter 24 VDC Temp. Limit = 100 ºC 0 Ohm (Recuperator-Flue gas) DHW Temp. Sensor 5 VDC 20 ºC =>... -
Page 27: Electrical Circuit Diagram
Failures / Errors Electrical Circuit Diagram 6 720 643 530-07.2O Fig. 2 GB012 - 25K... - Page 28 Failures / Errors Legends : Flue gas temperature limiter (STB) (Recuperator) Water level switch Ionisation electrode Pump Turbine LCD Dispaly connection Transformer Controller (room thermostat) connection Diagnostic connection Igniton transformer Supply cable DHW temperature sensor (NTC) Gas valve Ignition electrode Temperatur limiter (STB) Flow temperature sensor Flue gas safety (combustion chamber) sensor...
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Page 29: Structure
Failures / Errors Structure mo de res et 6 720 643 530-06.1O Fig. 3 GB012 - 25K... - Page 30 Failures / Errors Key to Figures : Expansion vessel Flue gas temperature limiter (STB) Condesing-Heat Exchanger (Recuperator) Water level switch (Condensate backup sensor) Combustion chamber Distribution pipe (Inj. nozzle) Ionisation electrode Safety valve (heating circuit) Autom. air vent valve Circulation pump Pump speed switch Condensate siphon Turbine...
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Page 31: Function Diagram
Failures / Errors Function Diagram Fig. 4 Control Unit (Cotronic 3) CH safety valve Water filling valve Siphon By-pass pipe Turbine DHW temperatur sensor DHW water flow rate limiter + Filter Flow temperature sensor Manometer Temperatur limiter Gas valve Combustion chamber (flue gas safety) sensor Siphon (trichtersiphon) (ops.) Ionisation electrode Regulator valve... -
Page 32: Gas Values (Cental Heating And Domestic Hot Water Circuit)
Gas Values (Cental heating and domestic hot water circuit) Gas Values (Cental heating and domestic hot water circuit) Burner pressure Gas flow rate (mbar) (l/min.) (kg/h) Gas Type Wobbe indeks 15 °C, 1013 mbar (kWh/ m³) 14,1 24,3 Net calorific value 15 °C, H (kWh/ m³) 10,5 34,9... - Page 33 Notes GB012 - 25K...
- Page 34 GB012 - 25K...