Four-Way Valve Abnormality (18 Class Only); Four Way Valve Abnormality (18 Class Only) - Daikin SUPER MULTI NX CTXS07JVJU Service Manual

SiUS12-928_B

6.11 Four Way Valve Abnormality (18 Class Only)

EA
Remote
Controller
Display
j
Outdoor Unit LED A
Display
Method of
The liquid pipe thermistor and the outdoor heat exchanger thermistor are checked to see if they
Malfunction function within their normal ranges in the operating mode.
Detection
Malfunction Either of the following conditions occurs 6 minutes after the compressor has started.
 Cooling operation
Decision
Conditions
 Heating operation
Tde: outdoor heat exchanger temperature
 Poor connector contact
Supposed
 Defective thermistor
Causes
 Defective outdoor unit PCB
 Defective four-way valve, coil, or harness
 Foreign substance mixed in refrigerant
Service Diagnosis
i h h h
1 2 3 4
The lowest liquid pipe temperature among the rooms in operation –Tde > 5°C (41°F)
The highest liquid pipe temperature among the rooms in operation –Tde < 0°C (32°F)
Troubleshooting for Outdoor Unit
170