5-2
5
5.3.2
Operating Failures
Operating failures are those that occur while using a unit that has passed its
power turn-on self test. Use the fault isolation information in Table 5-2 to
narrow the problem down to a specific area. The majority of installation
hookup faults can be fixed by following the table and making the necessary
corrections to the installation wiring or the program. Failures after the unit
has been running a while can be isolated by first substituting a known good
unit.
WARNING
If the fault isolation procedure re-
quires internal measurements, al-
ways remove power when disassem-
bling or assembling the unit. Use
extreme caution during trouble-
shooting, adjustments, or repair to
prevent shorting components and
causing further damage to the unit.
