COMPLETE TROUBLESHOOTING GUIDE
STEP HANDLING AND TEST DESCRIPTIONS EXPECTED RESULTS
10
To verify if the CO
2
sensor calibration is
required, bring the controller outdoor
and wait until the reading is stable (2-3
min). AVOID BREATHING NEAR THE
CONTROLLER.
IF REQUIRED , you will find the
calibration procedure on page 5-6.
The CO
2
ppm value on
the screen should be
between 350 and 450
ppm, even up to 500
ppm in urban
surroundings. In this
case, your controller
DOES NOT NEED
calibration.
Note: The built-in CO
2
sensor is precise to +/-
75 ppm (industry
standard), meaning
that two or more
controllers in the same
room are likely to
indicate different ppm
values, showing
variation between
them of up to 150
ppm. THIS IS NORMAL
and no action is
required. If the
variation between
readings is beyond 150
-200 ppm, one of them
is likely to require a
calibration. Be aware
that a difference of 100
ppm has insignificant
effect on plants.
COMPLETE TROUBLESHOOTING GUIDE
16
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