What happens
Air bypasses its intended path, or discharge re-enters the intake through an incorrect installation.
Typical symptoms
Poor performance with seemingly open wall ports; drafts or unusual cabinet temperatures.
Checks that distinguish this cause
Compare wall depth, adapter fit, internal separation and sealing with the model installation. Trace the actual intake/discharge paths rather than assuming two visible holes prove correct separation.
What can look similar
Outdoor wind or an internal control fault may also affect operation; use the model limits and evidence.
Repair direction
Correct the verified sealing, separation or mounting defect using approved materials.
Verify the repair
Verify intended air routing, room sealing and performance during the previously failing condition.
Equipment-specific limits
Applies to compatible AIO/Unico-style equipment, not a conventional split outdoor condenser. Adapter geometry, hole size, clearance and sealing requirements depend on the cabinet and model.
Practice this diagnosis
This cause is a reference topic; it does not yet have a dedicated simulated call. Browse the practice board.
References and applicability
Original HVACSim explanations with manufacturer and instrument-maker references for further reading. These resources support the subject; their model-specific examples are not specifications for every system.
- INNOVA (formerly Ephoca): AIO technical resourcesChoose cabinet style, generation and accessories. Installation, maintenance and troubleshooting documents are separate.
- Olimpia Splendid: Unico product literatureArchitecture and product selection; obtain the actual Unico installation and service manual for diagnostic limits.
Editorial review: 2026-09-29. Verify the current manual for the installed model.