Amp Guard – Troubleshooting and Installation tips

General tips

• Grey terminal is only used for measuring production (e.g. solar panels)

• Antenna: Screw on carefully. Never use it as a lever

• Power supply (12V)
  NOTE – polarity is critical

  • + (marked cable) → left

  • – (black cable) → right

• Adapter and current measurement terminal can be connected to the same fuse

• Startup time: up to 5 minutes before LED changes from blue to green

Installation – Power supply

230V in (AC):

• N → left (AC(N))

• L → right (AC(L))

12V out (DC):

• Marked cable → +V (left)

• Black cable → –V (right)

Important:

• Follow the labeling on the power supply, not standard assumptions

Troubleshooting (symptom-based)

1. Device does not start

Likely cause: Incorrect 12V polarity

Action:

• Verify that:

  • Power supply has 230V input

  • Marked cable is connected to + (left)

  • Black cable is connected to – (right)

• Confirm according to labeling on the power supply

2. Device is blinking (not solid light)

Blinking light = device is not correctly initialized

Likely cause:

• Incorrect wiring

• Module not properly mounted

Action:

• Check all wiring

• Press the module firmly into place:

  • Must sit flush

  • No visible gaps

  • Must feel mechanically stable

3. Phase indicator is red

Cause:
Two possible causes:

• Incorrect phase order

• Low load (< 2A on one or more phases)

Important:

• Load below approx. 2A can result in a red indicator without any fault

• This is normal behavior at low load

Action:

• Check current load:

  • If < 2A → no action required

• If normal load is present and indicator is still red:

  • Check phase order

4. Cannot connect to device WiFi

Scenario A – SSID not visible

Likely cause:

• Device has not started

• Incorrect 12V connection

Action:

• Verify the device is powered (LED on)

• Check 12V polarity (see point 1)

Scenario B – SSID visible but cannot connect

Likely cause:

• Common issue: poor contact between sensor and module

Action:

• Reinsert the current transformer connector

• Apply light pressure on the module:

  • Especially near the power terminal

• Ensure the connector is fully seated

If the problem persists:

• May be caused by poor contact in the PCB connection

Action (use caution):

• Identify the small green plastic parts near the connector (see image below)

• Carefully trim/remove these to reduce mechanical stress and improve contact

• Avoid damaging PCB or connector pins

Only perform this step if the issue persists after the above actions

Additional actions

• Forget the network in the phone’s WiFi settings and reconnect

• Test with another mobile device (to rule out client-side issues)

Sensor installation

• The sensor cartridge must be mounted at the top of the unit

• Ensure it is fully inserted and properly seated

Bottom line

• Correct 12V polarity resolves most startup issues

• WiFi issues are usually caused by physical connection, not software

• If all steps above are verified → replace unit / proceed with RMA according to process