Service manual

Troubleshooting by Indication on the Remote Controller SiUS28-902_a
141 Troubleshooting
3.43 “UH” Malfunction of System, Refrigerant System
Address Undefined
Remote
Controller
Display
UH
Applicable
Models
AII indoor unit models
RZQ18~30PVJU
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
 Improper connection of transmission wiring between outdoor unit and outdoor unit outside
control adaptor
 Defect of indoor unit P.C.B.
 Defect of outdoor unit P.C.B. (A1P)