Service manual

Troubleshooting SiENBE12-522A
234 Service Diagnosis
5.21 Electrical Box Temperature Rise
Remote
Controller
Display
L3
Outdoor Unit LED
Display
A 5 1 4 2 4 3 1 4 4
Method of
Malfunction
Detection
An electrical box temperature rise is detected by checking the radiation fin thermistor with the
compressor off.
Malfunction
Decision
Conditions
" With the compressor off, the radiation fin temperature is above 80°C (above 75°C for 80 · 90
class).
" The error is cleared when the temperature drops below 70°C (below 65°C for 80 · 90 class).
Supposed
Causes
" Fin temperature rise due to defective outdoor unit fan
" Fin temperature rise due to short-circuit
" Fin thermistor defective
" Connector in poor contact
" Outdoor unit PCB defective