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Cover, Display, and Reset Issues
Cover Binds on Backplate
• Car-efully remove the FlexStat cover from the
backplate and inspect for bent pins and/or termi-
nal socket connectors. If cover pins are bent, use
a needle-nose pliers to straighten them. If socket
connectors are bent, use a pointed object (such
as a thumbtack or straightened paperclip) to
straighten them. (Pushing the pointed object into
the socket from the back side can be helpful.)
• Replace the backplate.
NOTE: When installing the cover on the
backplate, be sure to not pinch or dislodge
any wiring. Do not use excessive force.
If there is any binding, pull out cover
and examine pins and terminal socket
connectors.
Display Is Blank (or Erratic)
• If the display comes on when a button is pushed,
Display Blanking is enabled. (See System Setup
on page
23.)
• Carefully remove the FlexStat cover from the
backplate, check pins and connectors, and rein-
sert. (See Cover Binds on Backplate on page
• Check for a tripped circuit breaker to the trans-
former.
• Check for proper supply voltage from the
transformer and that the transformer has enough
capacity (VA) for all connected devices (see their
respective data sheets).
NOTE: Wiring must be adequate to avoid
excessive voltage drop on long runs!
Allow plenty of "cushion." A meter may
be too slow to register transient dips or
peaks during startup.
page
36.
• Put another FlexStat on the installed backplate,
and if the second FlexStat functions properly,
replace the first FlexStat.
•
See also Display Keeps Resetting on page
FlexStat
29.)
See Wiring Issues on
29.
29
Display Freezes (Buttons Have No Effect)
• Carefully remove the FlexStat cover from the
backplate and ensure the WD (watch dog) jump-
er is installed on its two pins closest to the center
of the board (see Firmware Upgrade Failures on
page
34). The jumper is temporarily removed dur-
ing a firmware update and should be reinstalled
when the process is completed. Reinstalling the
cover on the backplate will restart the FlexStat.
• If the display is functioning (e.g. time is updat-
ing correctly), but the buttons have no effect
except to turn on the backlight, the FlexStat is in
Locked UI mode. See (Advanced) User Interface
(UI) Modes on page
•
See also (Advanced) CO2 Sensor (and DCV) on
page
10.
Display Keeps Resetting
• Carefully remove the FlexStat cover from the
backplate, check pins and connectors, and rein-
sert. (See Cover Binds on Backplate on page
• Check for proper supply voltage from the
transformer and that the transformer has enough
capacity (VA) for all connected devices (see their
respective data sheets).
NOTE: Wiring must be adequate to avoid
excessive voltage drop on long
runs! Allow plenty of "cushion" in
measurements A meter may be too slow
to register transient dips or peaks during
startup.
See Wiring Issues on page
• Put the FlexStat on a backplate connected to a
(test) transformer with short wiring and no other
connected devices. If the FlexStat works with the
test transformer, the wiring and/or transformer
in its previous location is inadequate. If it does
not work with the test transformer, replace the
FlexStat.
• Put another FlexStat on the installed backplate,
and if the second FlexStat functions properly,
replace the first FlexStat.
"SYSTEM ERROR" Is Displayed
NOTE: The next line is something like "CO2:
COMM ERROR," and the buttons have no
effect.
•
Restart the FlexStat. (See Resetting the FlexStat
on page
24.) If the buttons don't function, carefully
remove the FlexStat cover from the backplate and
reinsert it (or cycle the power from the circuit
breaker).
19.
36.
Operation Guide, Rev. L
29.)
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Table of Contents
Troubleshooting
