Contents
Hermann gas equipment is designed for heating large areas. Double-circuit units additionally supply housing with hot water. The equipment is equipped with convenient control with a display. When a malfunction occurs in the system, a code is displayed on the screen that indicates the cause of the breakdown. We will list all the error codes of the Herman gas boiler in the table.
Features of operation
The design of the boiler may differ depending on the series. So, the Habitat double-circuit device (Habitat 2) can heat an area of up to 280 m², while it has compact dimensions.
Ignition occurs automatically, the boiler is equipped with sensors to protect against draft disturbance, overheating, flame extinction. The equipment reacts to voltage drops: at the same time, the automation is activated and the fuel stops flowing into the burner.
The Micra series (Micra 2) also belongs to the dual-circuit types. The secondary heat exchanger allows you to heat water for hot water supply (DHW). Adjustment of settings is mechanical, the body has a wall-mounted arrangement. There is a flame control, ignition.
From the new line, the Herman Thesi 23 E models are presented. The power of the equipment is 30 kW, and the throughput is 17 liters per minute. These boiler models have automatic make-up function, which turns on at reduced pressure.
Fault codes
The manufacturer indicates the decoding of symbols in the instructions for the model. But it is not always clear to the user. Therefore, we will reveal the meaning of the errors and tell you how to perform an independent repair.
| Error code | Value | How to fix the problem |
| E01 | No flame. | If the flame goes out after ignition, try again by pressing the “Reset” button. Open the gas valve all the way. Make sure the live and neutral connections are correctly positioned. It is possible to unbalance the “neutral”: in this case, the burner lights up normally, but the system “does not see” the flame. In this case, error 01 occurs. |
| E02 | The overheating protection has tripped. | Switch off the appliance, let it cool down. Then repeat ignition. If nothing happens, contact a specialist. |
| E03 | The exhaust gas sensor has tripped. | Reverse thrust is possible with a gust of wind, which leads to the inclusion of protection. Re-ignite the burner with the “Reset” button. Check the chimney shaft. If soot and debris have accumulated there, it is necessary to clean it. |
| E05 | The thermostat has failed. “Service” lights up on the screen. | You can replace the sensor yourself or contact the service. |
| E05 | Malfunction of the DHW temperature sensor. | |
| E09 | Maintenance required. | By pressing the “reset” button, you can continue to use the boiler, but after three times the error sign will hang on the screen. Inspection Technician Needed |
| E10 | The sensor at the bottom indicates the pressure drop. | Tighten the taps and lower the air |
| E11 | Code appears on SE models. The system is blocked by a smoke detector. | Completely disconnect the device from the mains, restart. If the code does not disappear, call the wizard |
| E18 | The system is fed with water. Pressure drop. | Wait until the procedure is over, tighten the make-up tap. After that, the error will disappear. For other problems in the system, the icons E19, E21 will additionally be displayed. |
| E19 | It’s time for a drink. The procedure has not been completed. | Check the water supply tap and connections for leaks. Open the hot water supply from the boiler. If the flow strength is normal, the problem is a leak or a malfunction of the equipment. If the flow is weak, restore the make-up and reset the instrument. |
| E21 | Low pressure even after three reboots. | Turn on the “STAND-BY” mode and unplug the device from the mains. Did the code appear again after turning it on? In this case, call a specialist. |
| E22 | Data stored incorrectly. The “Service” icon is lit. | Contact the service center. |
| E24 | A signal was received from the thermostat. | Typical for outdoor models. Probably the floor is getting hot. Switch off the boiler. Wait 30 minutes for the floor to cool down and restart. |
| E32/E33 | Wiring error. | Contact the service center. |
| E35 | Flame problems. | The flame sensor is activated, notifying the presence of fire in the burner when it should not be. Replace the sensor, contact the service department. |
| E36 | The fuse has responded. | Reboot your device. |
| E38 | The outdoor thermometer is out of order. | Perform diagnostics and replacement. |
| E39 | Frozen radiator. | Water sensors detected a drop in temperature to 0 degrees. If after 15 minutes the temperature does not rise, contact the service. |
| E42 | Microprocessor error. | The problem is fixed by a specialist. |
Often, users of Hermann boilers complain that when switching from the “winter” mode to the “summer” mode, the equipment does not switch to water heating. In the “winter” mode, the system does not turn on the hot tap, so the pump works for heating without stopping. The reason is the flow sensor, which, when the water is turned on, sends a signal to the control board. When changing modes, switch slowly and carefully.
Now you can start troubleshooting. Carry out a timely inspection to avoid problems with the operation of the boiler.