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V8 VRF Indoor Units
6.1.37 EC1 - R32 refrigerant leakage sensor fault
Check the R32 refrigerant leakage sensor of faulty IDU
If the measured refrigerant saturation pressure at the liquid side or gas side is equal to the standard saturation pressure, there is
no refrigerant leak. Then check whether the sensor is damaged or contaminated by foreign materials (such as steam and oil). If so,
replace the sensor.
Error display
Faulty IDU: stops. Other IDUs of the same system: operate normally.
Error impact
ODU of the same system: operate normally.
When the IDU main control board receives sensor module fault signal from the R32 refrigerant
Error trigger
detection device
Error recovery
When the IDU main control board cannot detect a sensor module fault signal
Possible cause
See the Troubleshooting section.
Troubleshooting
Note:
1. How to reset when the sensor body is faulty or the sensor has reached the end of its service life:
After faults have been cleared, press and hold the S1 button on the control board for 20s to reset
the unit. After resetting, all the LED indicators are lit for 2s before they become dimmed. The R32
sensor life recorded by the control board EEPROM is cleared. Communication between the sensor
and the control board for the detection device is automatically restored.
2. The communication connection between the control board for the detection device and the
adapter board 1/2/3 is shown in Figure 1 below.
84
Digital display
EC1
Ope n the cover o f th e
R32 refriger ant de tection
device and ch eck the
status o f th e L EDs
Panel, display box, and wired controller
Cause 1: Red, yellow and green
ligh ts a re d immed, and after
pressing S1, the green ligh t is
still dimmed, indi cating the
control board for the de tection
device is powere d off
Cause 2: The ye llow lig ht
flashes twi ce every second,
indi cating the sen sor bo dy is
faulty
Cause 3: The ye llow lig ht
flashes every 6 seconds,
indi cating There is a
commu nicatio n fault betwee n
sensor and detection de vice
control board
Cause 4: The ye llow lig ht flash es
every 3 seconds, indi cating the
sensor has re ach ed the en d of its
service life
Cause 5: The co mmuni cation
cable between th e control boa rd
for the detecti on device and the
ada pte r bo ard 1/2/3 is short
circuite d, disconnected or
wrongly co nnecte d (2)
Cause 6: If th e e rror ca nnot be
cleared after cau ses 1/2/3/4 have
bee n e limi nated, the ma in control
boa rd o f IDU is damage d
Display position
Power on the con tro l
boa rd for the dete ction
device
Replace th e R32 sensor
module an d then pre ss
and ho ld S1 for 20s to
reset the yellow l ight (1)
Reconnect the
commu nicatio n cable
between th e sensor and
the con tro l bo ard. If th e
fault pe rsists, repl ace the
commu nicatio n cable (1)
Replace th e R32 sensor
module an d then pre ss
and ho ld S1 for 20s to
reset the yellow l ight (1)
Pro perly conn ect the
commu nicatio n cable
1/2/3 according to the
detectio n d evice
instruction s
Replace th e main control
boa rd o f th e IDU
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