Mitsubishi Electric QJ71GF11-T2 - Checking the Leds; When the RUN LED Turns off; When the MODE LED Turns off or Is Flashing

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12.3 Checking the LEDs
The following explains how to troubleshoot the system by the LEDs.
(1) When the RUN LED turns off
If the above action does not solve the problem, perform the following tests on the master/local module to check for
hardware error.
• Hardware test ( Page 64, Section 6.2.1)
• Self-loopback test ( Page 66, Section 6.2.2)
(2) When the MODE LED turns off or is flashing
If the above action does not solve the problem, perform the following tests on the master/local module to check for
hardware error.
• Hardware test ( Page 64, Section 6.2.1)
• Self-loopback test ( Page 66, Section 6.2.2)
Check item Action
Is the master/local module mounted correctly? Securely mount the master/local module on the base unit.
Check item Action
Is the master/local module set to online mode?
Change the mode of the master/local module to Online. ( Page 84,
Section 7.2)