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Jonathan RiceSep 15, 2025
What to do if my Buderus Logano plus GB402 shows undervoltage?
- RruizmichaelSep 15, 2025
If your Buderus Boiler indicates undervoltage, ensure that it has the correct power supply.
What to do if my Buderus Logano plus GB402 shows undervoltage?
If your Buderus Boiler indicates undervoltage, ensure that it has the correct power supply.
Why is there no flame within the safety time in my Buderus Boiler?
If there is no flame within the safety time (fault code '577') in your Buderus Boiler, it may be due to the gas supply pressure being too low. If the pressure is too low, notify the gas supplier.
Why is there excessive temperature difference in my Buderus Logano plus GB402?
If you are experiencing an excessive differential between the flow and return temperature (greater than 40 K) with fault code '565' on your Buderus Boiler, it may be due to problems in the hydraulics. Check the system hydraulics.
How to fix low fan speed on Buderus Boiler?
If the fan speed is too low (fault code '538') on your Buderus Boiler, it could be due to contamination in the fan or a defective fan. Clean the fan if required, or replace the fan.
How to fix intelligent high limit safety cut-out in flow (ISTB) in Buderus Boiler?
If the actual boiler flow temperature reaches the intelligent high limit safety temperature for the flow of 140 °C, and a flame current is detected or the solenoid valves are open, check the flow rate on the water side of your Buderus Boiler.
What to do if my Buderus Boiler flow temperature is below -5 °C?
If the control unit receives unrealistic values from the flow temperature sensor (flow temperature < -5 °C), check the cabling between the SAFe and the flow temperature sensor on your Buderus Boiler.
What to do if there is an excessive sensor differential at the boiler sensor between temperature sensors 1 and 2 in Buderus Boiler?
If there's an excessive temperature differential between temperature sensors 1 and 2 (deviation > 5 K/2s), try the following: 1. Press “Reset” on the SAFe. 2. Close the check valve on the cylinder primary pump if it is still open. 3. If flow and return have been swapped, connect flow and return correctly. 4. If required, clean or replace the plug-in connections on the boiler sensor and on the SAFe if they are contaminated or damaged.
What causes excessive differential between the flow and return temperature in Buderus Logano plus GB402 Boiler?
An excessive differential between the flow and return temperature, specifically greater than 40 K, is caused by problems with the hydraulics. Check the system hydraulics.
How to fix water pressure sensor fault (cable break) on Buderus Boiler?
If your Buderus Boiler displays fault code '568' indicating a water pressure sensor fault (cable break), eliminate any interruption.
How to fix return temperature interruption on Buderus Logano plus GB402 Boiler?
If your Buderus Boiler displays fault code '566' indicating a return temperature less than -5 °C (interruption), replace the cable if required.
Details warning symbols, signal words, and additional symbols used in the manual for clear communication.
Comprehensive safety guidelines covering gas, flue gas, installation, maintenance, emergencies, materials, air supply, water damage, combustion air, and operator error.
Confirms product compliance with EU directives and outlines its designed purpose for central heating and domestic hot water.
Provides guidance on water quality requirements and environmentally responsible disposal methods for the boiler and its packaging.
Details the Logano plus GB402 boiler, its main components, and includes a visual diagram of the unit.
Explains the controls and indicators on the BC10 base controller, including switches, rotary selectors, LEDs, and the display.
Instructions for setting domestic hot water (DHW) and boiler water temperatures using rotary selectors for optimal performance.
Guides on how to view system status, temperature, operating pressure, and fault codes on the control unit display.
Covers operating in manual mode during faults and setting the pump run-on time, especially for frost protection.
Step-by-step guide for safely starting the heating system using the BC10 base controller and programming unit.
Procedures for safely turning off the heating system under normal operating conditions and in emergencies.
Guidance on monitoring system pressure, adding water, and bleeding air from the heating system for optimal function.
Highlights the benefits of regular servicing for system efficiency, operational reliability, and combustion quality.
Provides instructions on cleaning the boiler casing using appropriate mild cleaning agents to prevent damage.
Explains how to identify operating faults via display codes and how to reset them using the 'Reset' key.
General| Type | Condensing boiler |
|---|---|
| NOx class | 5 |
| Permissible operating overpressure | 3 bar |
| Fuel type | Natural gas |
| Dimensions (HxWxD) | 600 x 600 x 600 mm |
