Fine offset HP2550 Operation Manual page 76

Problem
Temperature sensor
reads too high in the day
time.
Solution
Put batteries back in and resync with console by
powering down and up the console with the
sensor array about 10 feet away.
Bring the sensor array inside the house (you can
disconnect it from the rest of the sensors). The
LED next to the battery compartment will flash
every 16 seconds. If the LED is not flashing
every 16 seconds...
Replace the batteries in the outside sensor array.
If the batteries were recently replaced, check the
polarity. If the sensor is flashing every 48
seconds, proceed to the next step.
There may be a temporary loss of communication
due to reception loss related to interference or
other location factors,
or the batteries may have been changed in the
sensor array and the console has not been reset.
The solution may be as simple as powering down
and up the console.
Replace the batteries in the outside sensor array.
With the sensor array and console 10 feet away
from each other, remove AC power from the
display console and wait 10 seconds. Re-connect
power.
Make certain that the sensor array is not too close
to heat generating sources or strictures, such as
buildings, pavement, walls or air conditioning
units.
Use the calibration feature to offset installation
issues related to radiant heat sources. Reference
6.6.
76