Troubleshooting Your Blumat SystemUpdated 2 months ago

Two Categories of Problems

Almost every Blumat issue falls into one of two categories: the system is watering too much, or it's not watering enough. Start by identifying which one you're dealing with, then follow the steps below.

Overwatering — Soil Staying Too Wet

If a container or bed is staying too wet, or the sensor seems to be constantly running:

Step 1: Check if the sensor is actually running

Remove the 3mm line from the distribution end. Observe whether water is flowing directly from the sensor. If it is, continue to Step 2.

Step 2: Check for leaks in distribution

• Visually inspect BluSoak drip tape and all fittings
• Look for obvious wet spots or spreading moisture patterns
• If a BluSoak fitting is leaking: hand-tighten, then use channel locks to give an extra ¼ turn
• If the tape itself is leaking: cut out the damaged section and reconnect with a BluSoak tape coupler

Step 3: Verify soil moisture

Use a Digital Moisture Meter to check the moisture level near the sensor at the same depth. If the reading is below 50 mbar and the sensor is still actively watering, the sensor needs recalibration.

Step 4: Recalibrate the sensor

1. Remove the sensor from the soil
2. Unscrew the top cap — if water flow does not stop, the sensor is out of calibration
3. Insert a 3/32" Allen key through the protective cap
4. Turn clockwise to tighten for a drier set point
5. Make small adjustments — no more than ½ arrow (1/8") at a time
6. Each 1/8" change adjusts the set point by approximately 15–30 mbar
7. Reinstall and allow up to 48 hours to observe changes in soil moisture

Underwatering — Soil Staying Too Dry

If a container or bed is staying too dry and the sensor is not turning on:

Step 1: Confirm water flow at the source

Check that the reservoir, bucket, or hose bib is turned on and has water. This is the most common cause of underwatering.

Step 2: Check for air bubbles

• Remove the sensor from the soil
• Tilt it side to side while looking through the green plastic top
• A bubble larger than ½ inch may prevent proper operation
• If you see a large air bubble: disassemble, refill with water, and reassemble while submerged

Step 3: Inspect the ceramic cone

• Look for cracks or visible leaks
• If cracked, replace the ceramic bottom
• If intact, ensure the sensor is fully assembled and properly sealed — refill with water and screw back together tightly

Step 4: Reset the sensor

1. Refill the sensor with water
2. Use the cap dialing method to reset — refer to the Setting Up Your Sensors article for details
3. Reinstall into pre-moistened soil
4. Allow 24–48 hours for stabilization before evaluating again

Other Common Issues

System stopped after reservoir ran dry

Air has entered the supply line. Refill the reservoir, open all flush valves at the end of your trunk lines, and let water run until no more air is visible. Close valves once flow is steady.

BluSoak fittings leaking

Hand-tight is never tight enough for BluSoak. Use pliers or channel locks to add a firm extra quarter-turn to every fitting. This is the most common installation mistake.

Uneven watering across multiple sensors

Usually a pressure or flow issue. Check that your trunk line is properly sized for the number of zones, that all flush valves are closed during operation, and that no single zone line is significantly longer than others. Use a Digital Moisture Meter to compare tension levels across zones.

Sensor was set correctly but soil moisture has drifted

Environmental changes — temperature swings, growth stage changes, pot size — can shift how quickly the plant draws water. Re-check using a Digital Moisture Meter and make small adjustments (1/16" at a time) until the system stabilizes at your target range.

Still stuck? Contact us — we're happy to help troubleshoot specific setups.