York YEFE BZSM-MOW1 Series, Service Manual

Page: 99 / 110

Tr
oubleshooting
 Page 95 
5.5 EC (Refrigerant Leakage Detection diagnosis and solution)
Description : Define the evaporator coil temp.T2 of the compressor just starts running as Tcool.
If the following occurs 3 times, the display shows “EC” and the unit switches off:
In the first 8 minutes after the compressor starts up, if T2 <Tcool-2°C is not maintained for 4 seconds and compressor
running frequency is not higher than 50Hz for 3 minutes
.
Recommended parts to prepare:
• Faulty T2 sensor
• Faulty compressor
• Faulty capacitor of compressor
• Faulty indoo r PCB
• System problems, such as leakage or blockages
• Faulty capacitor of fan motor
• Faulty outdoor fan
Troubleshooting and repair :
Pow er off, then restart the unit 2 m inutes later .
Pow er off, then restart the unit 2 m inutes later .
A re any leakages present ?
A re any leakages present ?
C heck System for blockages and clear
blockages if present .
C heck System for blockages and clear
blockages if present .
D oes a problem rem ain ?
D oes a problem rem ain ?
Put your hands in front of the
indoor air outlet .
Put your hands in front of the
indoor air outlet .
Y ES
Is there cool air blow ing
out from indoor air outlet ?
Is there cool air blow ing
out from indoor air outlet ?
Is it securely
attached ?
Is it securely
attached ?
N O
C heck the T 2 sensor .
C heck the T 2 sensor . Y ES
C heck system for leakages .
C heck system for leakages .
N O
N O
Repair the leakage and
recharge the refrigerant .
Repair the leakage and
recharge the refrigerant .
Y ES
N O
The com pressor is operating
constantly
The com pressor is operating
constantly
The com pressor does not
operate
The com pressor does not
operate
D oes a problem rem ain ?
D oes a problem rem ain ?
Replace the com pressor
Replace the com pressor
Replace the capacitor of
com pressor
Replace the capacitor of
com pressor
N O
N O
N O
The com pressor operates
several m inutes then ceases
The com pressor operates
several m inutes then ceases
D oes a problem rem ain ?
D oes a problem rem ain ?
Replace the outdoor fan
Replace the outdoor fan
Replace the capacitor of fan
m otor
Replace the capacitor of fan
m otor
N O
N O
N O
Replace indoor PC B
Replace indoor PC B
Is it w ithin acceptable
param eters?
Is it w ithin acceptable
param eters?
M easure the resistance value
of the sensor .
M easure the resistance value
of the sensor .
Replace the sensor .
Replace the sensor . N O
Y ES
Y ES
Reinsert the T2 sensor
Reinsert the T2 sensor