Page 20
EH safety switch is
opened.
2. Replace the damaged EH safety
switch.
EC motor
failure(CN4)
Green LED blinks 9
times, stops 3s
E9
No EC motor
feedback
1. Check Modbus setting.
2. Check the EC motor.
EC motor
failure(CN5)
Green LED blinks 10
times, stops 3s
E10
No EC motor
feedback
1. Check Modbus setting.
2. Check the EC motor.
Anti-frozen
protection
Green LED blinks 12
times, stops for 3s
E12
When unit is
standby, Tr<2
ºC
.
1. Turn on unit to keep Tr high than 5ºC
Indoor coil sensor 3
failure (S6 PCB)
Green LED blinks 13
times, stops for 3s
E13
Ti3 sensor
unplugged or
damaged.
1. Check if Ti3 plug is connected or not.
2. Check if sensor’s resistance is correct
or not.
Indoor coil sensor 4
failure (S6 PCB)
Green LED blinks 14
times, stops for 3s
E14
Ti4 sensor
unplugged or
damaged.
1. Check if Ti4 plug is connected or not.
2. Check if sensor’s resistance is correct
or not.
PM2.5 sensor failure
(S6 PCB)
Green LED blinks 15
times, stops for 3s
E15
PM2.5 sensor
unplugged or
damaged.
1. Check if PM2.5 plug is connected or
not.
2. Check if sensor’s resistance is correct
or not.
AQI sensor failure
(S6 PCB)
Green LED blinks 16
times, stops for 3s
E16
AQI sensor
unplugged or
damaged.
1. Check if AQI plug is connected or not.
2. Check if sensor’s resistance is correct
or not.
C.
Master Slave Network Setup
1. Disconnect the communication plug from the
control box. Connect A to A and B to B for every
unit.
2. If the total length of wire is more than 1000m,
please use shielded wire in order to protect the
signal transmission.
3. First unit at left, middle units in the middle and
last unit at right. Check wire contacts by a multi-
meter after connections.
4. Check 1 and 2, 3 and 4, 5 and 6 to be sure the
connections are correct. If the resistance
between two wire contacts is too high, reconnect
the wire contacts. Reconnect the communication
plug to the control box.
First unit
Middle units
Last unit
2019-IOM-SWC-V-EC-I-001
