This guide helps you determine why the air conditioning does not switch off when the container door is opened.
Under normal conditions, opening the door should trigger a signal that eventually switches off the air conditioning. If this does not happen, the issue is typically caused by a break in that signal chain.
In the steps below, you will check each part of this chain, from the door contact to the air conditioning control, to identify where the problem occurs.
Troubleshooting steps
Step 1: Check the physical door state
Open and close the container door.
Verify:
The physical state of the door (open/closed).
What is shown in the signage or portal.
Whether the air conditioning switches off within 10 minutes.
Result:
If the system status does not match the physical door state, continue with the next steps.
If the air conditioning switches off correctly, the system is working as expected.
Step 2: Measure the door contact on the C04
The door contact is connected to Pulsecounter 1 (+/-) on the C04.
Use a multimeter to measure on Pulsecounter 1:
Check for a voltage change or switching pulse when opening or closing the door.
Result:
No change detected:
→ The issue is likely in the door contact itself or the wiring to the C04.Signal detected correctly:
→ The door contact is working correctly.
→ Continue to the next step.
Step 3: Check the Aspar module
Open the door again.
Check the Aspar module:
Does the input or output indicator light up as expected?
Result:
Indicator does not light up:
→ The Aspar module is not receiving the signal.
→ Check the wiring between the C04 and the Aspar module.Indicator lights up:
→ The signal reaches the Aspar module.
→ Measure with a multimeter if the output actually switches.
Step 4: Check the relay and air conditioning control
The air conditioning is typically connected via a normally closed (NC) relay.
This means:
The air conditioning switches off when the relay is activated
Measure on the relay:
Is the NC contact open or closed when the door is open?
Result:
NC contact remains closed:
→ The relay is not switching.
→ The signal is not reaching the relay.NC contact opens correctly:
→ The relay is working as expected.Relay switches, but air conditioning remains on:
→ The issue is likely with the air conditioning unit itself or the local wiring.
Conclusion
Follow the signal flow step by step:
Door contact → C04 → Aspar → Relay → Air conditioning
At each step, verify whether the signal is correctly passed on.
The first point where the signal fails indicates where the issue is located.