Johnson AE Series - Page 36

901-10113 - 36 - 9/16/2024
Problem
Possible Causes
Correction
Refrigerated
compartment
temperature not
adequately
maintained during
route.
Excessive frost accumulation on Cold Plates
See defrosting information in Section 3.7
Excessive time with doors open.
Reduce duration of door openings or number
of door openings.
Door strip curtains damaged or missing
Maintain strip curtains in good condition.
Excess heat load due to warm product.
Product must be at proper temperature prior
to loading. Be aware that warm product can
rapidly exhaust the cooling capacity Cold
Plates during the route.
Excess heat load due to poor door seals
See door seal information in Body Care and
Maintenance Manual.
FAULT
Low Suction Pressure
Refrigerant loss.
Contact JTB for assistance or contact
refrigeration technician.
Failed pressure sensor.
FAULT
High Discharge
Pressure
Ambient temperature exceeds the system
capabilities.
Move truck away from sources of excessive
heat.
Airflow is restricted through condenser coil.
Inspect condenser coil and condensing unit
for obstructions.
Clean condenser coil.
Failed pressure sensor.
Contact JTB for assistance or contact
refrigeration technician.
FAULT
Discharge Thermostat
Compressor is excessively hot
Check for restricted airflow.
Check for low compressor oil level.
Contact JTB for assistance or contact
refrigeration technician.
Faulty Discharge Thermostat
Contact JTB for assistance or contact
refrigeration technician.
FAULT
Suction Sensor
Discharge Sensor
Temperature Sensor
Loose wiring connection
Check termination in control panel on
Condensing Unit
Damaged sensor or wiring
Replace sensor (cable is integral with sensor)
Contact JTB for assistance or contact
refrigeration technician.
Line cord ends are hot
to the touch when
condensing unit is
running
Arcing caused by routinely unplugging unit
from grid power while the system is running.
Look for burnt spots on plug and socket. Have
damaged components replaced before
operating equipment.
NOTE: Always turn off power when
unplugging unit from Shore Power.
Contact-to-Wire connections loose in plug
body.
Have cord assembly serviced by a qualified
electrician.
Line cord wires worn or damaged.
If the jacket is cut or cracked, or if the inner
wires are visible, the line cord is unsafe. It
must be replaced and immediately removed
from service.
Compressor starts but
shuts off in less than 5
minutes. Restarts in
less than 15 minutes.
(Short Cycling)
Low Refrigerant.
Contact JTB for assistance or contact
refrigeration technician.
Faulty pressure sensor.
Faulty check valve.
Faulty solenoid valve.