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11.4
Checks Using LEDs
This section describes how to troubleshoot the system using the LEDs.
(1) The PW LED has turned off
Check the following items.
Check item
LEDs other than the PW LED is on.
The module power supply (24VDC) is not wired.
The module power supply (24VDC) is off.
The voltage of the module power supply (24VDC) is out of the
specified range.
(2) The RUN LED has turned off
Check the following item.
Check item
The voltage of the module power supply (24VDC) is out of the
specified range.
If the RUN LED does not turn on even after the above-mentioned action has been taken, the possible cause is a
module failure. Please consult your local Mitsubishi representative.
(3) The MODE LED flashes
Check the following item.
Check item
The temperature control module is in execution of the unit test.
(4) The MODE LED has turned off
Check the following item.
Check item
The MODE LED does not turn on even after the module power
supply has been turned on.
When LEDs other than the PW LED is on, the possible cause is a hardware failure.
Please consult your local Mitsubishi representative.
Wire the module power supply (24VDC).
Turn on the module power supply (24VDC).
Set the voltage value within the range of performance specifications.
Check that the voltage of the module power supply (external power supply) is within the
range of performance specifications. (Page 34, Section 3.2)
After the check, turn on the module power supply.
When the temperature control module is in execution of the unit test, the D LINK LED
turns on after the unit test is completed. Take actions according to the result of the unit
test.
(Page 282, Section 11.5)
The possible cause is a hardware failure. Please consult your local Mitsubishi
representative.
CHAPTER 11 TROUBLESHOOTING
Action
Action
Action
Action
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Table of Contents
Troubleshooting
