The USB updater now supports units running both Version 2 and Version 4 of the CON·X·US Interface.

Download the update ZIP file below, and unzip it onto a USB thumb drive. The four update folders should be visible in the top-most directory of the thumb drive's file system.

Plug the thumb drive into a Lochinvar unit running the CON·X·US interface software, and from the drop-down menu in the top-right corner, choose the "System Update" option. Under "USB Flash Drive Update," press the "Check for Updates" button. The unit will notify you if an update is available. Press "Yes" to begin the update process. When updates are completed, your unit's control panel will automatically restart.

Download v2.86 / v4.13

Release Notes

Version 2


  • Remove editing of Cascade Max Non-Condensing Setpoint from some Crest models that don't support it
  • Improve reliability of internet system updates


  • Fix visibility of Cascade Setpoint Max features on some models


  • Add missing error codes for certain newer Crest single-fan models
  • Clarify error messages on dual-fan units to specify which fan is causing issues
  • Ensure offset and differential are properly synced with the unit at startup on Powerfin water heaters
  • Fix app crash when boiler rate minimum has an unexpected configuration
  • Fix rare app crash during cloud update check


  • Add proof-of-closure support for certain newer Crest models
  • Remove setback times when the setback offset is set to zero
  • Fix issue where Powerfin water heater offset/diff may not have been set correctly from the cloud
  • Fix a few isolated instances of app crashing


  • Show control panel reboot count on About screen


  • Fix time zones on graph title and axis


  • Fix crash when leaving Service Maintenance screen
  • Turn the unit back on (if needed) even after a write error
  • Fix incorrect Active Setpoint and Demand determinations, particularly on water heaters
  • Swap positions of min/max buttons on Service maintenance screen
  • Fix Advanced Setup crash for certain values of Boiler Rate Min


  • Add support for Galaxie models
  • Powerfin WH - Remove Boiler Pump Status label
  • Ensure that personality changes are properly recognized
  • Enable storage of longer Maintainer Phone numbers longer than 10 digits
  • Use 15-minute increments for setback times
  • Use 10-second increments for certain time sliders
  • Fix ambiguity between lockouts and blocks in some cloud-reported error codes
  • Add automated crash reporting
  • Crest SF - Fix out-of-range HW tank min/max slider values
  • Crest Eagle - Add special unit size case
  • Provide an error code for unrecognized events
  • Hide cascade setpoint value when out of range
  • Show blanks on view table items when they are out of display range
  • Reword Revert button to Clear Changes for consistency with mobile app
  • Report certain properties to the cloud whenever they change, so that mobile app device list stays accurate
  • Add support for rtl8188eu WiFi dongles

Version 4


  • Fix crash when applying changes on Galaxie models


  • Fix units sending spurious lockout and block notifications during normal cycling
  • Fix crash in Service Maintenance screen
  • Hide Gas Valve 1 on Service Maintenance screen for models that don't support it
  • Show kernel version in About screen
  • Migrate web updates to new server
  • Support units with different screen mounting orientations