36
TK 61650-18-OP-EN
Buzzers
The buzzers are energized when the vehicle battery and the electrical supply
are connected simultaneously (the unit continues running in Standby mode).
The buzzers are also energized if the doors open, if this option is selected.
Alarm Code Descriptions
Table 2. Color Code Definitions
OK TO RUN CHECK AS SPECIFIED TAKE IMMEDIATE ACTION
Alarm Description
Manual Start
OL Electric Motor Overload (Electric standby models only) - The
electric motor overload relay has tripped due to excessive current
draw.
If the problem persists when the unit is restarted, contact your Thermo
King Dealer.
bAt Low Battery Voltage - Check vehicle battery.
Auto Start
HP High Pressure Alarm - The system has detected excessively high
discharge pressure.
If the problem persists when the unit is restarted, contact your Thermo
King Dealer.
LP
Low Pressure Alarm - The system has detected excessively low
suction pressure.
If the problem persists when the unit is restarted, contact your Thermo
King Dealer.
PSE High Pressure Sensor Failure - The high pressure sensor has
become faulty or disconnected.
Contact your Thermo King Dealer.
tEP, tP4 Thermal Protection Alarm - If the problem persists when the unit is
restarted, contect your Thermo King Dealer
dr1, dr2 Cargo Doors Are Open (Units with door switch option only) -
Check if the Doors are open. if not, then the door switches are faulty, or
improper door switch configuration.
Contact your Thermo King Dealer.
tCO Control Module Overheating
If the problem persists when the unit is restarted, contact your Thermo
King Dealer.
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