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Service Instructions for Phase Harness / Cluster Block Compressor Only
Service bulletin
Parksmart Rev 5 NON OPT IDLE - Compressor / controller diagnostics
System Issue: No Cooling / Compressor not running: Moving forward, please use these diagnostics steps when
troubleshooting the above conditions.
DO NOT REMOVE THE CLUSTER BLOCK CONNECTOR FROM THE COMPRESSOR TERMINALS!
Follow the below instructions for proper diagnostic steps.
Check for 12 VOLT from the F2 fuse going to the PCB controller pin C1. Also, check voltage to pin C3 (Aux Battery
Sense). If Aux battery voltage is below 11.3 the ParkSmart unit will not operate in parked mode. Before
condemning an internal component or unit, also try operating the unit with engine running.
OVERVIEW
Compressor will not operate unless these items are in their operational state –refrigerant, high
pressure switch, freeze switch and the compressor thermal limit.
Outside temperature must be above 40°F and the sleeper temperature must be above 60°F
View Service Link for active fault codes. See Technical guide for testing these items.
In parked mode, when you turn the ParkSmart unit on (parked led light on) - 2 relays should close.
(1) The compressor relay LS 3 will close and send 12 VOLT main power from terminal 87, through the F 1
compressor fuse, to the compressor controller section of the control PCB assembly. Once you have confirmed 12
volts through F1 fuse continuing through the 4 pin harness connector attached to the control PCB, your
compressor should be operating. Before condemning a refrigerant loop for a compressor not operating, please
attempt to operate the unit using a replacement controller. If the compressor does not operate using a
replacement controller, replace the refrigerant loop. Do not remove the cluster block connector or harness
from the compressor terminals!
(2) blower/fan relay LS 4 will send main power through its terminal 87, through F 4 and F 5 fuses to the blower
and fan.
Please call the Nite Line at 1-866-204-8570 for any further assistance
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