Applies to: MED1000GHD and MED750GHD units
Every Minus40 medical refrigeration unit fitted with a Bluetooth® controller gives you a direct window into how your storage environment is performing, without opening the door or interrupting your workflow.
This article covers what the controller does, how to use it, and how to interpret the most common alarms.
What it is
The Bluetooth controller is a local, app-based temperature monitoring and control system built into your Minus40 unit. It connects to a mobile app over Bluetooth, giving you access to live readings and historical data without any additional infrastructure or subscription.
What it does
- Temperature monitoring: records internal temperature at regular intervals, building a continuous history of your storage conditions
- Temperature and alarm history: keeps a record of past readings and alarm events, so you can review trends or investigate an issue after the fact
- Data export: temperature records can be exported for your own record-keeping or compliance requirements
- Live data access: connect via the app for real-time temperature and status readings
- Setpoint adjustment: view and adjust temperature settings from the app
- Compressor monitoring: check whether the compressor is running as expected
How to connect
- Download the Carel Applica app: Google Play or Apple App Store.
- Open the app and connect to your unit’s controller via Bluetooth. The controller display will show “BLE” when ready to pair.
- Log in as prompted.
- Once connected, you can view live data, temperature history, alarm history, and setpoint information, or export records as needed.
Setup steps and passwords are unit-specific. If you don’t have your login details on hand, contact our service team at M40 Refrigeration.
What happens during a power interruption
If power is lost:
- Note the time power was lost.
- Keep doors closed to preserve internal temperature for as long as possible.
- Follow your facility’s cold chain emergency policy to determine when contents need to be relocated.
- Once power is restored, allow the unit’s startup delay to complete before reloading, and allow the internal temperature to stabilise within its rated range.
If your controller logs a power failure alarm, it’s worth checking stored temperature history in the app once the unit is back online, to confirm your stock stayed within range throughout the outage.
Troubleshooting: alarm codes
| Code | Meaning | What to do |
|---|---|---|
| HI | High temperature alarm | Check the door is closed properly, verify power is available, and minimise door openings. Contact M40 Refrigeration if the alarm persists. |
| LO | Low temperature alarm | Check for unusually low temperatures that could affect temperature-sensitive contents. Contact M40 Refrigeration if the alarm doesn’t clear. |
| dor | Door open alarm | Close the door fully and check nothing is preventing it from sealing. |
| HF | High temperature after power failure | Indicates the unit became too warm following a power outage. Verify product integrity according to your facility’s policies before continuing to use the contents. |
| HA | High temperature during normal operation | Indicates the unit remained above the acceptable temperature for longer than the permitted period. This is more serious than a standard HI alarm and should be investigated promptly. |
| rE | Temperature probe fault | The controller cannot accurately measure temperature. Contact M40 Refrigeration. |
For any alarm code not listed here, contact our service team for guidance.