Buderus Logano GE434 - User Manual

Questions and Answers

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Thomas JenkinsAug 6, 2025
Why does the Buderus Logano GE434 main flame burn for only a few minutes before shutting off?
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  Garrett MartinAug 6, 2025
  If the Buderus Boiler's main flame burns for only 2 to 5 minutes before shutting off and restarting after 15 minutes, with the control device intermittently indicating a fault, it may be due to the integral flue gas monitor detecting flue gas escaping from the draught hood. You should determine and remedy the cause for insufficient flue draught. If the fault cannot be remedied immediately, shut the burner down.
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Tony JacobsAug 11, 2025
What to do if Buderus Logano GE434 burner faults 3 minutes after start, showing no ignition spark?
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  Edgar NelsonAug 11, 2025
  If your Buderus Boiler burner starts but goes into a fault state approximately 3 minutes after the second start, displaying a fault on the control device and not recognizing an ignition spark, check if an ignition spark is audible with the ignition cable pulled off. If not, replace the intermittent ignition. If yes, replace the ignition electrode or pilot burner.
J
James FrancisAug 16, 2025
Why is there a flue gas odor in my Buderus Logano GE434 room?
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  Mr. Ryan MasonAug 16, 2025
  If the Buderus Boiler has a flue gas odor inside the boiler room, it could be due to flue gas escaping around the draught hood or deposits/fiber contamination on the heat exchanger surface. Determine and remedy the cause for insufficient flue draught. Shut the burner down if the fault cannot be remedied immediately. Also, check for deposits or fiber contamination on the heat exchanger surface through the clean-out cover and combustion chamber and clean the boiler dry or, if required, wet.
C
Carmen OlsonAug 21, 2025
What causes a Buderus Logano GE434 Boiler to fault after 3 minutes with a good pilot flame but no ionization current?
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  benjamin19Aug 22, 2025
  If the Buderus Boiler burner starts but faults about 3 minutes after the second start, displaying a fault and having a perfect pilot flame but no measurable ionization current, it might be because the N and L leads are interchanged. Remedy the fault.
A
Amy BridgesAug 27, 2025
What causes a Buderus Boiler's main flame not to burn when the pilot is lit?
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  Richard BuchananAug 27, 2025
  If the Buderus Boiler's main flame does not burn but the pilot flame burns constantly without any fault indication, it could be due to wiring issues, a faulty gas solenoid valve or burner control unit, or poor contact. Correct wiring in accordance with the wiring diagram. Check the gas solenoid valve or burner control unit, and replace faulty parts, if required. Check and replace contacts, if required.
D
Deborah ParkAug 31, 2025
What to do if my Buderus Boiler burner clicks but doesn't start during initial setup?
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  dtaylorAug 31, 2025
  If the Buderus Boiler burner starts during initial start-up, the gas valve click is audible, but there's no further reaction and the control device shows no fault, it means that the burner control unit detects insufficient gas pressure. Remedy the installation fault.

Summary

General Boiler Operating Conditions

Gas Categories in EU Countries

Lists gas types and pressure requirements for EU countries per EN 437.

Safety

Correct Boiler Use

Defines the intended application and safety guidelines for the boiler.

Important Safety Notes

Highlights critical safety instructions and warnings for installation and operation.

Boiler Connection Procedures

Flue Pipe Connection and Gas Monitoring

Details on flue pipe installation, cross-section, and flue gas monitoring requirements.

Filling and Leak Checking

Procedure for filling the heating system and testing for leaks before commissioning.

Heating System Start-up

Commissioning Steps

Step-by-step guide for initial boiler and system start-up.

Recording Gas Characteristics

Essential initial step for data collection during commissioning.

Checking Gas Pipes for Leaks

Critical safety check during the commissioning process.

System and Burner Activation

Procedures for activating the heating system and the boiler burner.

Troubleshooting Boiler Faults

Analog Burner Control Unit Faults

Lists common faults, causes, and remedies for analog burner control units.

Digital Burner Control Unit Faults

Lists common faults, causes, and remedies for digital burner control units.

Converting to Different Gas Types

Conversion Within a Gas Family

Steps for converting the boiler to a different gas type within the same family.

Procedure A: Setting Gas Burner Output

Detailed steps for setting gas burner output based on nozzle pressure.

Buderus Logano GE434 Specifications

General

Efficiency	Up to 93%
Fuel Type	Oil/Gas
Type	Cast Iron Sectional Boiler
Dimensions (HxWxD)	Varies depending on the model (number of sections). Example for GE434-220: 1410 x 1280 x 1740 mm
Weight	Varies depending on the model (number of sections). Example for GE434-220: 1520 kg
Water content	Varies depending on the model (number of sections). Example for GE434-220: 290 l