What happens
A fitted accessory cannot perform its intended water-disposal function or is installed incorrectly.
Typical symptoms
Water accumulates or an accessory reports a fault despite a clear permitted drain path.
Checks that distinguish this cause
Identify the actual accessory and its power, interlocks and service procedure. Compare mounting and operating conditions with its manual; do not infer function from another accessory’s name.
What can look similar
Water production beyond the accessory’s permitted conditions may expose a design issue rather than a failed part.
Repair direction
Correct the proven installation or replace a confirmed failed approved accessory without defeating level protection.
Verify the repair
Verify the accessory’s checkout and the complete water-management path under representative humidity.
Equipment-specific limits
Determine cabinet orientation, operating mode and accessory presence first. Condensate evaporators, nebulizers and other disposal systems are optional and have their own instructions; do not assume every AIO has one.
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.