Loosen the hand primer on the transfer pump.

You can change the spin-on fuel filter if needed now.

Clean out the bolt, the screen, and the banjo fitting.

Remove the filter from inside the bolt and check for debris clogging the screen.

Check the inline fuel filter, located in the transfer pump inlet hose fitting.

If the solenoid clunks, then it has energized and is okay.

The fuel solenoid will clunk, and the starter will engage.

The unit will buzz, indicating a startup.

Turn the unit on and keep a finger on the solenoid.

The fuel solenoid is located on the back of the injection pump.

Position yourself in front of the unit so that you can touch the side or back of the Yanmar engine's fuel solenoid.

The following troubleshooting tips should solve this problem quickly. Minus a few exceptions, you likely have a fuel system problem. This is one of the most common alarm codes you will encounter.

Trace the wiring circuit and check any fuses or switches connected to the circuit.ġ0 Advantages of Riding by Motorcycle Thermo King Alarm Code 20: Engine Failed to Start.

You will need a wiring schematic for the Thermo King unit you are working on.

Do a voltage drop test to check for an open circuit.

If the unit still won't start, then verify voltage to the HPCO switch.Check the wiring harness on the 8D circuit.

If the unit starts, then the HPCO switch is defective.

Disconnect the harness and bypass the HPCO switch.

The HPCO is located on the top of the compressor.

Check for a defective high-pressure cutout (HPCO) switch.

Warning: Any attempt to jump start the battery may cause it to explode.

If the starter fails to engage and the voltage falls to 1V or 0V, then you have a bad battery.Jump the starter and observe the battery voltage.Use a voltmeter and verify that the battery voltage is correct (12V).The screen may go blank or blink on and off. When you turn on the unit, it loses power before engaging the starter.This is more common than you would expect.Be sure to check the idler gear box for frozen or worn bearings.Open up the lower and upper front doors and check for missing or broken belts. Here are a few common tips to make the process a little easier: This shutdown alarm code can be difficult to troubleshoot. Thermo King Alarm Code 10: High Discharge Pressure

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