Attached are documents that outline the error codes for both the Beckett 1285 and 1287 modules. The 1285 module is for modulating heat configurations and the 1287 is for Staged heat configs. If the attachments are not preferred or downloading them is an issue then the information is below.
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. More specific troubleshooting info will be in the Voyager 3 with Symbio Application Guide (link below).
Voyager 3 w/ Symbio 700 Controls Application Guide