901-10113 - 35 - 9/16/2024
6 Troubleshooting
This chart has been prepared to help the user to efficiently resolve the most common problems
encountered in operating a Cold Plate System with IFM Controls. Due to the variations in options,
equipment, and installation, some information may not apply to your system. If you experience a
problem that is not listed, or are unable correct the problem, please contact Customer Service at
Johnson Truck Bodies. We are dedicated to helping you enjoy trouble-free service from our products.
If experiencing a fault, look for it in the “Problem” column.
User Interface does
not turn on
Check electrical supply and connections.
Blown 5A ATO fuse for PLC VBBS or VBB1
(in condensing unit control panel)
Check for damaged wiring, replace fuse.
12V power supply not functioning.
Check if power supply is overheated.
Check if power supply has short-circuit fault.
Loose cable on User Interface.
Check that locking nut is tight.
System on, but not
Running
System Switch is OFF, Status is STANDBY
Press button F4 at HOME screen to turn
System Switch to ON.
Status is PLTS FROZE.
(Suction pressure is below CUT-IN setpoint)
Verify that compressor starts after
temperature rise in the refrigerated
compartment.
Solenoid valve was not opened after Pump-
Down cycle.
Suction pressure is below CUT-IN setpoint due
to pump-down.
Suction pressure is below CUT-IN due to
running compressor with manual contactor
over-ride.
In the PUMP-DOWN menu, select the
command OPEN VALVE FOR 20 SECONDS
Check FAULTS screen to see more information.
Contact JTB for assistance.
Contact JTB for assistance or contact
refrigeration technician.
System Running,
not reaching normal
operating
temperature
Cold Plate system can require up to 24 hours
to reach desired temperature if the truck has
been out of service. See Section 3.3.
Excess heat load due to warm product loaded.
Product must be at proper temperature prior
to loading. System will require extra time to
pull down if product is warm.
Excessive frost accumulation on Cold Plates
See defrosting information in Section 3.7
Excess heat load due to poor door seals
See door seal information in Body Care and
Maintenance Manual.
One or more Cold Plates not functioning (still
warm while others are cold)
Affected plates may accumulate less frost than
other plates in the system.
Contact JTB for assistance or contact
refrigeration technician.
Partial loss of refrigerant.
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