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Symbio® 700 Indoor Options Module (IOM) Not Communicating

Updated

Table of Contents

     

    Troubleshoot: 

     

    Does the IOM Module have power?

    • Verify that LED 8 is solid green in the middle of the module, and LEDs 5 & 6, located under the P4 connector, are lightly flickering. 
    • Verify IOM-P5 has 24VAC between Red and Black

    • Verify IOM-P5 has 3.2 - 3.9 VDC between Blue and Orange

       

       

    • If there is no power at IOM-P5, verify UC-P4/J4 on the main Symbio unit controller and trace it to the IOM.

     

     

    Does the Factory-Installed module have the address plug?

     

    • The Indoor Options module, when factory-installed, includes a pre-installed address plug on J11. The factory plug is already configured for address 75. 
    • The rotary dials should be set to 00.

     

     

     

    Is the Field-Installed module addressed?

    • The field-installed Indoor Options module must be addressed to address 75 on the provided rotary dials. 
    • SW1 is addressed to 7
    • SW2 is addressed to 5

     

    • Sometimes, you may need to turn the dial 360° to set the address. Cycle power or go to Tools > Service > scroll down to IMC LINK RESET (Phone App).

     

     

    Is the UC module configured?

     

    • To verify the communication status, go to Tools > Service in your mobile phone app.
    • When it says Communicating, there should be no active alarms for the Indoor Options module.
    • When it says 'Communicating - Not Configured,' it means the Indoor Options module is communicating, but there is no configuration associated with it. This will show two active alarms.
    • You must configure the IOM under Settings > View Configurations > Edit.

     

     

     

    Configurations:

     

     

    Alarms:

    • Diagnostic: Unit Communication Failure
    • Indoor Options Module Communication Status

     

    WARNING:

    Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.

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