Headwind HVC EC Speed Controller with Thermal Probe

What does the Headwind HVC EC Speed Controller with Thermal Probe do?

It automatically adjusts EC fan speed based on your set temperature using a connected thermal probe. This helps stabilize your grow space’s temperature and humidity levels, aiding airflow, odour control, and even drying if needed.

Which fans are compatible with the Headwind HVC EC Speed Controller?

This controller works with EC fans that support the standard 3.5mm-style control input. It does not work with AC inline fans or oscillating clip fans. You can run 1–4 matching EC fans; mixed models may behave unpredictably.

Where should I place the thermal probe for best results?

Place the probe near canopy height, away from direct airflow, hot lights, or cold intakes. Poor placement can cause rapid fluctuations or inaccurate readings. Avoid extending the cable unless you're using high-quality, shielded extensions.

What’s the difference between Manual Mode and Auto Mode?

Manual Mode lets you set a fixed fan speed. Auto Mode uses the probe to adjust fan speed up or down based on how far your space is from the target temperature. You can also set a baseline speed to keep air moving when temps are stable.

What are the speed levels and how do they work?

Speed levels range from 0 to 6 (0% to 100%). Some fans require a higher starting level (e.g., Level 2+) to begin spinning. Lower speeds reduce noise, but airflow may be limited by filters, bends, or ducting.

Can the controller help reduce noise or control smells?

Yes. By keeping fans at lower speeds when temps are stable, it reduces noise and helps maintain consistent extraction — which supports odour control when used with a carbon filter.

Does the Headwind HVC have a temperature alarm?

Yes. You can set a high-temp alarm that forces fans to maximum speed if the space overheats. A bell icon appears when it’s active. Sudden max speed or beeping often indicates an alarm or sensor issue.

What do error codes like E1 or “Er” mean?

E1–E4 refer to fan issues on outputs 1–4. “Er” typically means the thermal probe is disconnected or damaged. Check that all fans are plugged into consecutive outputs starting at OUT1 and that the probe is secure.

What is fan failure detection and do I need it?

This optional feature monitors fan RPM and alerts you if a connected fan stops responding. It's useful for critical grows but should be configured correctly based on how many fans you're using.

Do I need a separate power supply for the controller?

No — it usually gets power from the connected EC fan. Make sure the fan is powered and the probe is connected. Without both, the controller may not power on or operate normally.

Does the controller remember settings after power loss?

Yes. Most units retain your last-used temperature, mode, and baseline settings even after a power outage. It’s still a good idea to double-check after restarts.

How do I switch between Celsius and Fahrenheit?

With the unit powered off (but connected), hold the MODE button for a few seconds. Use the arrow buttons to toggle between °C and °F, then save your selection.

Does it support Night Mode or button locking?

Yes. Night Mode turns off the display light, and you can lock the buttons to prevent accidental changes. Some listings mention Day/Night temp cycles, but core features are Auto, Manual, alarms, and detection.

Where should I mount the Headwind HVC controller?

Mount it on a dry, stable surface outside your grow tent if possible. Avoid areas exposed to spray, high humidity, or direct heat. It’s not water-resistant and should be treated like indoor electronics.