Toshiba BMS-SM1280HTLE Service Manual page 39

13-4-4. Lock input does not stop the air conditioner.
No.
1 Communication error with the digital input / output relay
interface.
2 Communication error with the air conditioner.
3 The inputs in the setting file are incorrect.
13-4-5. Fire alarm input does not stop the air conditioner.
No.
1 Communication error with the digital input / output relay
interface.
2 Communication error with the air conditioner.
3 The inputs in the setting file are incorrect.
13-4-6. Clearing fire alarm input does not enable air conditioner
operation.
No.
1 Communication error with the digital input / output relay
interface.
2 Communication error with the air conditioner.
3 The controller is not turned on.
* If any of the above does not solve the problem, turn off the indoor unit, and turn it on again.
13-4-7. Communication error with the digital input / output relay
interface is displayed.
No.
1 The digital input / output relay interface is not turned on. Check if the "POWER" LED of the digital input / output relay interface
2 The RS-485 communication wiring is not connected or
disconnected.
3 The RS-485 communication wiring is incorrect or
connected with wrong polarity.
4 The terminal resistance is not connected.
5 The wiring length is too long.
6 The communication circuit of the digital input / output
relay interface failed.
7 The communication circuit of the controller failed.
Cause
Cause
Cause
Cause
1.Check if communication error with the digital input / output relay
interface is detected.
2.Check if communication error with the air conditioner is detected.
1.Check if communication error with the digital input / output relay
interface is detected.
2.Check if communication error with the air conditioner is detected.
Check if the lock input name is correctly set in the [Indoor unit group
definition] sheet of the setting file.
1.Check if communication error with the digital input / output relay
interface is detected.
2.Check if communication error with the air conditioner is detected.
1.Check if communication error with the digital input / output relay
interface is detected.
2.Check if communication error with the air conditioner is detected.
Check if the lock input name is correctly set in the [Indoor unit group
definition] sheet of the setting file.
1.Check if communication error with the digital input / output relay
interface is detected.
2.Check if communication error with the air conditioner is detected.
1.Check if communication error with the digital input / output relay
interface is detected.
2.Check if communication error with the air conditioner is detected.
Turn on the controller.
illuminates.
Check the conduction of the communication wiring.
Check the terminal block connected.
Check the value of the terminal resistance with a tester.
Change it to the specified wiring length.
Replace with the normal digital input / output relay interface and check that
the communication is available.
Replace with the normal controller and check that the communication is
available.
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Solution
Solution
Solution
Solution