Ec (Refrigerant Leakage Detection Diagnosis And Solution) - York YEFE BZTM-MOW1 Series Service Manual

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 indoor 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 uni t 2 m i nutes l ater.
Pow er off, then restart the uni t 2 m i nutes l ater.
N O
The com pressor does not
The com pressor does not
operate several m i nutes then ceases
operate several m i nutes then ceases
Repl ace the capaci tor of Repl ace the capaci tor of fan
Repl ace the capaci tor of Repl ace the capaci tor of fan
com pressor
com pressor
N O
D oes a probl em rem ai n?
D oes a probl em rem ai n?
N O
Repl ace the com pressor
Repl ace the com pressor
D oes a probl em rem ai n?
D oes a probl em rem ai n?
Y ES
Put your hands i n front of the
Put your hands i n front of the
i ndoor ai r outl et.
i ndoor ai r outl et.
I s there cool ai r bl ow i ng
I s there cool ai r bl ow i ng
out from i ndoor ai r outl et?
out from i ndoor ai r outl et?
N O N O
The com pressor operates
The com pressor operates The com pressor i s operati ng
The com pressor i s operati ng
C heck system for l eakages.
C heck system for l eakages.
m otor
m otor
N O
D oes a probl em rem ai n? A re any l eakages present?
D oes a probl em rem ai n? A re any l eakages present?
N O
C heck System for bl ockages and cl ear
C heck System for bl ockages and cl ear
Repl ace the outdoor fan
Repl ace the outdoor fan
bl ockages i f present.
bl ockages i f present.
Y ES C heck the T2 sensor.
C heck the T2 sensor.
I s i t securel y
M easure the resi stance val ue
M easure the resi stance val ue
constantl y
constantl y
of the sensor.
of the sensor.
I s i t w i thi n acceptabl e
I s i t w i thi n acceptabl e
param eters?
Repl ace i ndoor PC B
N O Repl ace i ndoor PC B
Repai r the l eakage and
Repai r the l eakage and
Y ES
recharge the refri gerant.
recharge the refri gerant.
N O
I s i t securel y
N O Rei nsert the T2 sensor
Rei nsert the T2 sensor
attached?
attached?
Y ES
N O Repl ace the sensor.
Repl ace the sensor.
param eters?
Y ES
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