User Manual

Page 10
VIII/ KCA & KCW Troubleshooting Guide
Fault Possible Cause Possible Solution
Unit Does Not Operate
Low or No Cooling
Thermostat Has No Power Check the breaker
Power Interruption The unit has auto restart and
will automatically restart after
a 2 minute safety delay when
power is restored (some 3rd
party thermostats require a
manual reset)
Blockage of Air Duct Check ducting for any
blockages for excessive
bend radius’
EPO N/C Switch Open Check the EPO/Fire alarm
contacts for a N/C condi-
tion, install the original
factory jumper and retest
Condenser Blocked Make sure that the
condenser inlets and outlets
are not blocked. Verify that
the condenser intake air is
not overheated due to lack
of ventilation or condenser
heat
Thermostat Malfunction Test thermostat for proper
outputs
Dirty / Blocked Air Filters Clean and/or replace air filter
Excessive Duct Static Evaporator ducting should
not exceed 30’ or equiva-
lents and bend radius should
be larger than twice that of
duct diameter.
High Pressure Switch
Actuated
1. Check condenser fan
motors for operation
2. Check for over heating of
condenser because of
inadequate ducting of
condenser heat
3. After checking 1 & 2 reset
HPS by pressing the reset
button
No Cooling -
Alarm Sounding