If you’re just reading fault codes on an older heater, MHH Auto is a cheap gamble. But expect hours of troubleshooting with limited success.
: Open the software and select the heater family (e.g., Airtronic) and specific model number. Many newer versions support automatic detection to simplify this step. Functional Check
| Problem | Likely cause | Solution | |--------|--------------|----------| | No communication | MHH Auto uses 5V logic, heater needs 12V K-line | Use a (12V↔5V) | | Edith sees only COM1-4 | Software limitation | Reassign USB COM port to COM2 in Device Manager | | Connection drops | Wrong baud rate | Test 9600, 10400, 19200 | | Heater not responding | Heater is in sleep mode | Activate heater briefly (e.g., EasyStart remote on) | | Faulty data | MHH clone has weak transceiver | Add a 1kΩ pull-up resistor on K-line to 12V |
Always run any crack or patch through VirusTotal. MHH Auto is generally safe, but due diligence protects your PC.
Without this software, a technician is essentially blind. However, it is not a standalone tool—you need a hardware interface.