CYCLE-SENTRY Diagnosis
152
Unit does not disengage starter
when engine is started
Defective starter Test starter in Continuous Run
mode
Defective RPM sensor Test 52A circuit
Open or grounded FS-1 or FS-2
circuit from RPM sensor to
CYCLE-SENTRY module
Test FS-1 or FS-2 circuit
Defective CYCLE-SENTRY module Test CYCLE-SENTRY module
Unit turns On and reset switch
trips
Unit fails to start (normal indication) Test for normal starting in
Continuous mode
Open 52 circuit from start relay to
CYCLE-SENTRY module
Test 52 circuit
Open 8S circuit from start relay to
starter
Test 8S circuit
Defective CYCLE-SENTRY module Test CYCLE-SENTRY module
Standard 4-mode unit has no low
speed cool in automatic
start-stop mode (unit shuts Off
after High Speed Cool
Defective thermostat Test thermostat
Open diode D6 Test D6 diode
Standard 4-mode unit will not
initiate start from defrost
Open 29 circuit Test 29 circuit to PC board
Open D11 diode or R9 resistor, or
29T circuit on PC board
Test D11 diode or R9 resistor and
29T circuit on PC board to
thermostat
Defective thermostat Test unit thermostat
Unit will not initiate start if engine
temperatures drop below 60.0 F
(15.5 C)
Defective block temperature
thermostat
Test block temperature thermostat
Open 8B circuit to block
temperature thermostat
Test 8B circuit
Open 7A circuit from block
temperature thermostat to run relay
Test 7A circuit
Unit will not stop when load
temperature thermostat is
satisfied
Defective block temperature
thermostat switch
Test block temperature thermostat
switch
Defective load temperature
thermostat
Test load temperature thermostat in
Continuous Run mode
Engine temperature below 120 F
(49.0 C)
Check engine temperature after
warm up
Battery not charged Charge battery
Defective battery sentry Replace battery sentry
Charging system faulty Correct charging system
Condition Possible Cause Test Procedure
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