German Buderus boilers are productive, powerful equipment. It is popular not only in private houses and apartments, but also in production. The “smart” control system controls the operation of the heater – in case of malfunctions, a special code is displayed on the display. What do Buderus boiler errors mean? What to do to restore the operation of equipment? We will describe in detail how to deal with the problem.
Features of operation
The Buderus company is famous for the production of boilers that run on almost any type of fuel. You will find solid fuel models that do not depend on the availability of electricity. For work use firewood, coal, briquettes. Differ in the long period of burning, high efficiency.
Liquid fuel operate on diesel, gas. Solid fuel can be paired with diesel vehicles. Electric are dependent on the availability of electricity. In production or in an apartment, tanks of various sizes and volumes can be installed, they are mounted (wall-mounted), floor-mounted. Boilers can be single-circuit (for heating only) and double-circuit (for heating and hot water supply).
Error codes and malfunctions
The Buderus Logamax gas boiler is equipped with automation that controls job. Therefore, if the system gives an error on the display, do not be alarmed. You can find their decoding in the instructions and our article.
How to reset the error? It is recommended to reboot the equipment. To do this, hold “Reset” for 5 seconds. If the code is displayed again, then look for the causes of the problem.
| Error code | Causes of appearance | Troubleshooting |
| A- | The code will be deactivated after 15 minutes. The system is in chimney sweep mode. | |
| -N | Heating mode is on. | |
| =N | The boiler works for hot water supply (DHW). | |
| OA | It is in the mode between turning on and turning off the burner. | |
| OS | Burner start. | |
| OE | The exchange of thermal energy is less than the minimum performance of the device. | |
| OH | The equipment is ready to go. | |
| 0L | Opening gas valves. | |
| 0U | Starting the boiler. | |
| 0Y | The supply temperature is higher than the set temperature. System shutdown. | |
| 2E | Air purge mode is in operation. Another possible reason is temperature. flow is growing rapidly. | Pressure measurement, adding water to the system. |
| 2Н | The protection of the pump and the three-way valve against jamming has worked. | |
| 2P | Limitation start: the DHW temperature rises rapidly in the system. | How to fix the situation:
|
| 5Н | Automatic testing. | |
| Н11 (CL) | Problems with the hot water temperature sensor. | The sensor and its wiring, the tightness of the contact connection are checked for serviceability. Defective elements must be replaced. |
| N13 | The inspection time has expired. | Inspection is in progress, errors are cleared. |
| N31 | The pump is not recognized. | Diagnostics. |
| 0Y | The sensor indicates that the inlet water temperature is above normal (more than 95 degrees). | What to do:
|
| 3A (A3) | The fan does not start. | Tighten wires and plugs. Replace the unit if it breaks. |
| 3F | Continuous operation of the burner and fan lasts 24 hours. Shutdown on “rest”. | |
| 3C | The fan spins very fast. | Make sure the flue is working properly. |
| 4S (1S) | The protection against overheating of the heat exchanger, or at a high temperature of the combustion products, has turned on. |
|
| 4U | Problems with the temperature sensor on the supply line. There has probably been a short circuit. | Calling contacts, installing a new part. |
| 4Y | Breakage of the temperature sensor. | Actions are similar to 4U. |
| 6А | There is no flame. |
|
| 6S | The boiler is off, the gas is shut off, but the system detects a flame in the burner. | You need to check:
|
| 6L (def) | The burner is functioning, but the signal from the ionizer is not received. | Adjustment and restart of the burner. If there is no ignition, code 6A will be displayed. |
| 7L | Time control error on first delay or second start. | Replaced regulator BC20. You can also check the wiring leading to the control unit or replace the module itself. |
| 9L (d7) | There were problems with the gas fittings. | Diagnosis of fittings, its wiring. Repair. |
| 9P | Not recognized KIM (boiler identification module). | Install the KIM in the correct position. |
| 9C | The DIP switch is incorrectly set. | Reconfiguration. |
| EL | The KIM module or BC20 control module is broken. | Replacing elements. |
| 8Y | The AT90 temperature relay has tripped, or it is faulty, blocked. There is no jumper between the relay terminals. Condensation pump does not start. |
|
| fd | Pressing the button for more than 30 seconds. | Press the button again, but hold for less than 30 seconds. |
Typical faults
Equipment nodes can break without displayed codes. We list the main problems faced by users.
Burner does not turn on. Set the heating regulators and control systems to the “On” mode. Check out these details:
- Protective machines;
- Thermal relays;
- Temperature limiter.
It is possible that the gas sensors have been triggered. Wait 15 minutes – if the boiler does not start to function, clean the chimney shaft. Install new sensors.
No spark. Pull out the ignition cable and try turning on the ignition. If sounds are heard at the same time, then the burner or electrode needs to be replaced. If not, a transformer.
The burner does not light up. What to do:
- Open gas valves;
- Measure pressure;
- Eliminate air accumulation. To do this, you need to restart.
Problems with ionization. No current. How to proceed:
- Correctly connect connections N and L;
- Measure voltage between L and PE. If it is missing, the PE is grounded by installing a transformer;
- Loose connection of the ionization wire. Tighten contacts or replace;
- The burner control is defective. Install the correct part.
Low ionization current (less than 1,5 MPa).
- The ionization electrode is clogged. Cleaning is in progress.
Boiler parts are constantly in contact with moisture, which leads to oxidation of contacts and batteries. Requires device monitoring.
Hear the sound of boiling. Components and parts require cleaning. Experts recommend once a year to carry out a technical inspection of the device, to clean the elements from scale. The heat exchanger, in which water constantly circulates and heats up, is most susceptible to salt deposition. Cleaning filters can be installed to avoid blockages. They reduce the concentration of salts in the water.
Water noise is heard, prolonged heating. This may also indicate an abundance of scale or incorrect settings. The pump speed is adjusted, its turbine is checked.
We have listed all the error codes that can be seen on the displays of the Buderus boiler. Do not forget: when symbols appear, first of all, a reset, a reboot are carried out, and after that you can start looking for the causes of the malfunction and eliminate it.