PKG-SVP01B-EN
75
Programming
DIAGNOSTICS
Failure Modes
When any condition results in the unit’s
inability to perform a normal function, it
is said to have entered a failure mode.
There are two types of failure modes.
1. An “Analog input out of range” failure
mode.
This failure mode occurs when a
sensing device such as a zone tem-
perature sensor or a humidity sensor
begins to transmit information that is
outside its allowable range.
2. A “Fault recognition by input logic”
failure mode.
This failure mode occurs when the
UCM receives information that does
not “make sense” or does not conform
to its predefined logic.
Diagnostics
There are three types of diagnostics:
1. Informational
Does not affect machine operation
2. Automatic Reset
Affects machine operation but returns
to normal when diagnostic condition no
longer exists
3. Manual Reset
Affects machine operation and must be
reset at the HI or by cycling power to
unit for normal operation to resume.
To troubleshoot diagnostics, reference
the
Installation, Owner, and Diagnostic
Manual
that ships with the unit:
SCXF-
SVX01A-EN
ships with Signature Series
units and
SCXG-SVX01A-EN
ships with
Modular Series units.