Trouble Shooting - Chore-Time Chore-Tronics Model 8 User& Installer's Manual

Trouble Shooting

Trouble Shooting
Problem
The Screen is blank, but
outputs appear to be
operating normally.
The screen does not respond
when pressing any of the
Subject Buttons
An output does not respond
to its toggle switch or an
output does not work under
any condition
The control seems
completely dead — the
screen shows nothing under
any condition, and the
indicator lights are off
Relays 1-8, or 1-16, are
completely non-functional.
The failed temp. sensor or
failed static pressure alarm is
on, or the readings are clearly
wrong.
42
Possible Cause
The screen is defective.
The flat cable between the KD board and
the screen is defective, loose or
disconnected.
The KD board is defective.
The relay board is defective.
The MS board is defective.
The flat cable between the KD board and
the MS board or MS relay board has a
problem.
The fuse for incoming power is blown.
The circuit breaker supplying power to the
control is tripped.
The power supply or I/O board is bad.
The KD board is defective.
The flat cable from the power supply board
to the IO board or IO board to the KD
board is defective.
The associated MS board has the wrong
address set in its dip switches.
The flat cable between the KD board and
the associated MS board or that MS board
and its relay board is defective or not
connected properly.
The associated MS board is defective.
Bad connections between the temperature
sensor and the Model 16 or 8 controls IO
board.
Defective or damaged sensor.
Bad connection or improper installation of
static pressure hoses.
Defective IO board.
Chore-Tronics Model 16 & 8 Control
Solution
Replace the display.
Readjust connections or replace
cables.
Replace the KD board.
Replace the relay board.
Replace the MS board.
Readjust connections or replace
cable.
Replace the fuse.
Reset the breaker.
Replace the power supply or I/O
board.
Replace
Readjust or replace.
Reset the switch setting.
Readjust or replace.
Replace
Correct the bad connection.
Replace
Correct
Replace
MT1554A 9/9/98 1/6/99