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Repair or replace any parts that are worn, damaged, or failing to make a good connection. AOS WPC - Tech Training 42 of 72 Ashland City, TN © 2007 Servicing should only be performed by a Qualified Service Agent VF BOILER SERVICE MANUAL ERROR MESSAGES (CONT) DISPLAYED MESSAGE CONDITION/INDICATES CHECK/REPAIR “Display Fail” • Plug UIM comm cable into the other “internal” comm port on the MCB. (see page 32) Communication between the MCB and UIM has • Check comm cable to the UIM. Turn off power been interrupted - the MCB is having trouble and Install a new/different comm cable communicating with the UIM. (standard Cat 5 network cable). Important Service Reminder: • Inspect both internal communication ports on MCB and UIM for damage or wear. Repair or When performing any troubleshooting steps outlined replace any components that are worn or dam- in this service manual always consider the wiring aged. and connectors between components. Perform a close visual inspection of all wiring and connectors to a given component before replacement. Ensure wires were stripped before being crimped in a wire connector, ensure wires are crimped tightly in their connectors, ensure connection pins in sockets and plugs are not damaged or worn, ensure plugs and sockets are mating properly and providing good contact. Failure to perform this critical step or failing to perform this step thoroughly often results in needless down time, unnecessary parts replacement, and customer dissatisfaction. “No Config Key” • Ensure the Config Key is present and securely plugged into the J23 socket on the MCB circuit MCB does not recognize the presence of a Config board (see pages 14 and 34). Key at MCB socket J23. • Closely inspect Config Key plug pins - if damaged Install a new Config Key for the correct The Config Key contains model specific (Btu/hr & Btu/hr model and fuel type. fuel type) blower speed programing data. This data is written to the MCB’s internal memory at power up. • Install a new Config Key for the correct Btu/hr The MCB then uses this data to instruct the VFD model and fuel type. (variable frequency drive) to modulate blower speed • Closely inspect the pins in the J23 socket on the during various operating states. MCB for signs of wear or damage. If this key is not plugged into the J23 socket on the MCB circuit board the EMC 5000 control system will declare a fault and display this error message on the UIM. AOS WPC - Tech Training 43 of 72 Ashland City, TN © 2007 Servicing should only be performed by a Qualified Service Agent VF BOILER SERVICE MANUAL ERROR MESSAGES (CONT) DISPLAYED MESSAGE CONDITION/INDICATES CHECK/REPAIR “Config Key CRC” Data read from the Config Key by the MCB was not properly confirmed at power up. The Config Key contains model specific (Btu/hr & fuel type) blower speed programing data. This data is written to the MCB’s internal memory at power up. The MCB then uses this data to instruct the VFD (variable frequency drive) to modulate blower speed during various operating states. Important Service Reminder: When performing any troubleshooting steps outlined in this service manual always consider the wiring and connectors between components. Perform a • Ensure the Config Key is securely plugged into the J23 socket on the MCB circuit board (see pages 14 and 34). • Turn power off to the boiler for 1 minute and then turn power back on. Press the Select button on the UIM to clear any error messages. This will provide the MCB a second attempt to read and store data from the Config Key. • Closely inspect Config Key plug pins - if damaged replace the config key. • Install a new Config Key for the correct Btu/hr model and fuel type if this error message continues. • Closely inspect the pins in the J23 socket on the MCB for signs of wear or damage. close visual inspection of all wiring and connectors to a given component before replacement. Ensure wires were stripped before being crimped in a wire connector, ensure wires are crimped tightly in their connectors, ensure connection pins in sockets and plugs are not damaged or worn, ensure plugs and sockets are mating properly and providing good contact. Failure to perform this critical step or failing to perform this step thoroughly often results in needless down time, unnecessary parts replacement, and customer dissatisfaction. “Config Key Part” MCB has detected the Config Key is defective. The Config Key contains model specific (Btu/hr & fuel type) blower speed programing data. This data is written to the MCB’s internal memory at power up. The MCB then uses this data to instruct the VFD (variable frequency drive) to modulate blower speed during various operating states. • Turn power off to the boiler for 1 minute and then turn power back on. Press the Select button on the UIM to clear any error messages. This will provide the MCB a second attempt to read and store data from the Config Key. • Install a new Config Key for the correct Btu/hr model and fuel type. See pages ...

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