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Symbio® 700 Fresh Air Options Module (FAOM) Not Communicating

Updated

Table of Contents

     

    Troubleshoot

     

    Does the FAOM 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 FAOM-P5 has 24VAC between Red and Black
    • Verify FAOM-P5 has 3.2 - 3.9 VDC between Blue and Orange

     

     

     

     

     

     

     

     

     

     

     

     

    • If FAOM-P5 does not have VAC or VDC, go to the access panel above the heating section. If the Indoor Options module is present, verify that IOM-P4 has 24VAC between Red and Black and/or IOM-P4 has 3.2-3.9VDC between Blue and Orange. 
    • If there is no power on IOM-P4, verify IOM-P5, which is the connector to the right of IOM-P4.
    • If there is no power at IOM-P5, verify UC-P4/J4 on the main Symbio unit controller.

     

     

     

     

     

     

    • If the Indoor Options module is not installed, verify the harness jumper that goes across the access panel above the heating section.

     

     

     

     

    Does the Factory-Installed module have the address plug?

    • The Fresh Air Options module, when factory-installed, includes an address plug pre-installed on J11. The factory plug is already configured for address 76. 
    • The rotary dials should be set to 00.
    • If the Fresh Air Options module says "Not Communicating" on the mobile phone app under Tools > Service, try the steps below.
    • If the address plug is securely connected and you have verified the address on the plug, remove the plug and set the rotary dials to 76 (SW1 to 7 and SW2 to 6). 
    • Cycle power to the unit or reset the IMC link through the mobile phone app. Go to Tools > Service > scroll down to IMC LINK RESET.

     

     

     

     

     

     

    Is the Field-Installed module addressed?

    • The field-installed Fresh Air Options module must be addressed to address 76 on the provided rotary dials. 
    • SW1 is addressed to 7
    • SW2 is addressed to 6

     

     

     

     

     

     

     

    • 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.

     

     

    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 Fresh Air Options module.
    • When it says 'Communicating - Not Configured,' it means the Fresh Air Options module is communicating, but there is no configuration associated with it. This will show two active alarms.
    • You must configure the FAOM under Settings > View Configurations> Edit.

     

     

     

     

     

    Configurations

     

     

    Alarms

    • Diagnostic: Unit Communication Failure
    • Fresh Air 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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