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Daniel Wilson
Daniel Wilson,
Category: Medium and Heavy Trucks
Satisfied Customers: 4976
Experience:  Owner at DJ Wilson
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Will act like it wants to start but only turn 1/2 a round

Customer Question

Will act like it wants to start but only turn 1/2 a round then flashes 56y code.
JA: What's the make/model/year of your truck? Engine type?
Customer: Sorry, I should have explained I have been reading and did think you needed that info. It the Therma King APU 2010 model
JA: Are you fixing your truck yourself? What have you tried so far?
Customer: Changed the oil in the APU and now it will not crank. I've not really tried anything, don''t really know where to start. Worked perfectly no codes or anything when I changed the oil and filter.
JA: Anything else you want the truck mechanic to know before I connect you?
Customer: I think that's all that I know to tell.
Submitted: 2 months ago.
Category: Medium and Heavy Trucks
Expert:  Daniel Wilson replied 2 months ago.

Hi my name is***** will be glad to try to help. What is the model and serial number information from the ID tag off of the unit so I know exactly which APU you have

Expert:  Daniel Wilson replied 2 months ago.

That is actually SBY for standby mode.

Optional Standby Operation
The optional TriPac HMI Controller Standby Mode allows the
system to be controlled by an external source which is typically
the truck’s ignition system. This is used to disable the TriPac
system when the truck’s engine is running. The display will
show “Sby” when the controller is in this mode. During
Standby mode the controller is temporarily disabled and none
of the TriPac systems will operate. Voltage sensing and the
optional coolant temperature sensing functions are also
disabled while in this mode.

Expert:  Daniel Wilson replied 2 months ago.

Options Used With Standby Operation
Standby Truck Integration
When the truck’s ignition switch is in the Off or Accessory
position, the TriPac APU will operate normally if the APU
Engine On/Off switch and the TriPac HMI Controller Main
Power Key are On. If the truck’s ignition switch is in the On
position, the TriPac HMI Controller will be forced to Standby
Mode.
Truck Integration Selector
Switch
When the dash mounted Truck Integration
Selector Switch is in the Normal position,
the TriPac APU will operate the same as
with Standby Truck Integration above.
However, if the dash mounted Selector
Switch is in the Standby position, the APU
will be forced to Standby mode

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