Ecobee ecobee3 lite - Step 11: Secure Wire Connections; Step 12: Manage Excess Wires

STEP 12
Carefully push any excess wire back into the
hole and ensure there are no drafts coming
from the hole(s) in the wall.
TIP:
Large holes behind your thermostat will affect temperature readings.
Prevent drafts by covering the hole(s).
STEP 11
Tug on the wires gently to ensure they are
securely connected.
TIP:
When a wire has been connected correctly, the lever on that
block will lower.
PEK
W2
W1
R
H
C