ACiQ wall-mount / concealed-duct / multi-zone
North AmericaDUCTLESS FIELD ENCYCLOPEDIA
Mini-split & monoblock reference
Find the right brand documentation, then follow the evidence through the component guides. Mini-splits, multi-zone inverter systems and all-in-one monoblocks each have their own diagnostic paths.
55 brand references14 component guides41 cause articles
Match the model before the code
A fault code is an entry point, not a parts verdict. Meanings, test values, terminal functions and controller procedures vary by model, market and generation. Official links below may lead to a document library, product page or support team; obtain the service manual for the exact equipment.
This directory covers major and regional brands and installed equipment. Availability varies by market. These guides are training references; ductless faults are not yet interactive simulator calls.
Ductless commissioning checklist →Start with the nameplate
55 brand references
Air-Con single-zone / multi-split
North America & export linesDuctless heat-pump systems
North America; current and installed equipmentArcoaire single-zone / multi-zone ductless
North AmericaAUX single-zone / multi-zone
North America & internationalBlueridge ductless systems
North AmericaClimate 5000 ductless
North America & internationalEvolution / Preferred / Legacy ductless
North AmericaCarrier ductless
North America & internationalComfortmaker ductless systems
North AmericaComfortStar mini-split lines
North America & internationalResidential mini-split / multi-zone
North America & internationalResidential ductless / multi-zone / VRV
North America & internationalDay & Night ductless systems
North AmericaDELLA single-zone / multi-zone
North AmericaDurastar ductless / multi-zone
North AmericaAC and hybrid solar mini-splits
North AmericaAIO all-in-one heat pumps / optional ERV
North America; Ephoca installed baseFloating Air ductless
North AmericaAIRSTAGE ductless and multi-zone
North America & internationalGE ductless equipment
North AmericaSingle-zone / multi-zone ductless
North America & internationalHaier ductless and multi-split
North America & internationalDeluxe / QuietComfort / Performance ductless
North AmericaHessaire ductless heat pumps
North AmericaResidential split / multi-room
International; Australian resource entry pointairHome / residential splits / multi-split
International; regional linesInnovair ductless systems
North America & internationalKeepRite ductless systems
North America; check local availabilityKinghome mini-split
North America & regional linesSingle-zone / multi-split / quick-connect
North America & regional linesCurrent and legacy mini-split platforms
North America & internationalResidential duct-free / MULTI F / MULTI V
North America & internationalDuctless single-zone / multi-zone
North America & internationalM-Series / P-Series / CITY MULTI
North America & internationalResidential splits / multi-split / VRF
International; select regional distributorDuctless / Multi-Moov
CanadaDIY / Advantage and other ductless lines
North AmericaDuctless air conditioners and heat pumps
North AmericaUnico heat pumps without an external unit
International & North American supportOLMO ductless systems
North America & regional linesRoom splits / multi-split
International; select regional supportDuctless / quick-connect heat pumps
North AmericaPioneer ductless systems
North AmericaDuctless mini-split systems
North America & regional linesDuctless mini-split systems
North America & regional linesResidential single-zone / FJM / DVM
North America & internationalLETO / AURA and multi-zone
North AmericaSharp mini-split heat pumps
North America & internationalInverter room split / multi-split
International; regional product linesDeluxe / QuietComfort / Performance ductless
North AmericaResidential splits / multi-split
International; UK resource entry pointTOSOT ductless / multi-room
North America & regional linesDuctless / Mitsubishi Electric product resources
North America; regional lines varyYORK ductless / archived product lines
Regional and installed equipmentStart with the component or symptom
Converts the supply into the controlled motor power used by variable-speed compressors. Input supply, DC link, output module and cooling are distinct diagnostic stages.
3 causes →Carries the documented power and communication paths between indoor units, outdoor controls and optional distribution equipment.
3 causes →Provides room, coil, piping, outdoor-air and discharge-temperature inputs used for demand, protection and refrigerant control.
3 causes →Meters refrigerant under controller commands, often responding to several measured temperatures and operating states.
3 causes →Moves air across indoor and outdoor coils using model-specific motor drives, feedback and air-direction controls.
3 causes →Routes indoor cooling condensate through gravity drains or approved lift pumps and prevents condensation outside the intended pan.
3 causes →Connects a matched split-system refrigerant circuit through approved piping or dedicated precharged connections.
3 causes →Coordinates several indoor units sharing outdoor capacity, piping circuits and the permitted mode logic.
3 causes →Requests operating mode, setpoint and supported features through local, wired, wireless or optional thermostat interfaces.
3 causes →Manages frost removal and cold-weather heating through coordinated sensing, compressor control, fans and refrigerant routing.
3 causes →Routes outdoor heat-exchanger air through the wall openings, adapters and external louvers of a single-package system.
3 causes →Manages water within a single-package heat pump through the model’s drain arrangement and any fitted disposal accessory.
3 causes →Provides the installed system’s specified outdoor-air ventilation and energy-recovery function where an ERV module is fitted.
3 causes →Uses the supported AC and/or photovoltaic inputs on purpose-built hybrid mini-split equipment.
2 causes →