LG THERMA V AHNW16606B0, Service Manual, Page: 36 / 81

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Displaying the error MODULE 2 - ALARM
Description of error Failure of module 2
Response of internal unit
controller The device automatically restarts after the error is resolved
Possible causes • The wiring of the expansion relay panel of module 2 is damaged or not implemented correctly.
• The expansion relay panel of module 2 is damaged or defective:
Troubleshooting 1. Turn off power supply and turn it back on. Wait to see if the communication resumes.
2. Error of the module 2 relay panel wiring:
a. Check the wiring of module 2 relay panel according to the electrical wiring scheme. If an error is
found in the wiring, resolve it.
3. The relay panel of module 2 is damaged or defective:
a. Carry out an inspection; in case there is damage or inadequacy, the relay panel of module 2 must
be replaced.
b. Check the user interface if there is communication between PLC, MBIO12.
1 MODULE 2 - ALARM The reading of the error in the first line of the PLC controller inter-
face. Hold the key to display
- SERVICE-DISPLAY -
To enter the menu, press the (ENTER) key.
Hold the key to display the lower part.
2 MODULE 2. 45 73 Bet:0 Bet:0 – no problems with the connection with MD2
Bet:5 – Bet > 0 means there is no 100% connection between mod-
ules.
Modules not used in the system have a value of
Bet:9 , which
means the modules do not and must not report.
Use keys and navigate to other modules.
4. If the module is physically present and reports with Bet:9 , check the module itself if the signal LED diode
RUN, RX and TX is lit (on newer models it flashes):
RUN – MBIO12 is operational,
RX. TX - the signal means there is communication between MBIO12 and PLC
5. Check whether all bridges are on their designated spots (see chapter 2.6.1).