14
Sleep Mode
a) The sleep mode can only be set when the unit is in cool mode or heat mode.
b) If the sleep mode is activated when the unit is in cool mode, then the indoor fan will run at low speed and Ts will increase by 3.6ºF
over 2 hours.
c) If the sleep mode is activated when the unit is in heat mode, then the indoor fan will run at set speed and Ts will decrease by 3.6ºF
over 2 hours.
d) Changing the mode of operation will cancel the sleep mode.
The cool mode sleep profile is:
The heat mode sleep profile is:
Auto Fan Speed
In COOL mode, the fan speed cannot change until it has run
for more than 30 seconds. Fan speed is regulated according to
the profile below.
LED Lights
LED Display and Error Description
In HEAT mode, the fan speed cannot change until it has run for
more than 30 seconds.
For all units
Power / Operation LED light (both green)
Unit on
Power LED Off, Operation LED On
Unit in standby
Power LED On, Operation LED Off
For all units - Operation LED light (Green)
Error Description
Blink
Reason
Remedy
Electrical heater failure Green LED blinks 1 times,
stops for 3s
Only for unit with EH.
EH safety switch is open.
1. Change fan speed to high.
2. Replace the damaged EH safety switch.
Indoor coil sensor 2
failure
Green LED blinks 2 times,
stops for 3s
Ti2 sensor unplugged or
damaged.
1. Check if Ti2 plug is connected or not.
2. Check if sensor’s resistance is correct or not.
Return air sensor
failure
Green LED blinks 3 times,
stops for 3s
Room sensor unplugged or
damaged.
1. Check if Tr plug is connected or not.
2. Check if sensor’s resistance is correct or not.
Indoor coil sensor 1
failure
Green LED blinks 4 times,
stops for 3s
Ti1 sensor unplugged or
damaged.
1. Check if Ti1 plug is connected or not.
2. Check if sensor’s resistance is correct or not.
Indoor coil low
temperature protection
Green LED blinks 5 times,
stops for 3s
Water temperature is lower
than 37.4ºF.
Check the water temperature.
Indoor coil over heat
protection
Green LED blinks 6 times,
stops for 3s
Water temperature is higher
than 158ºF.
Check the water temperature
EC motor failure
Green LED blinks 9 times,
stops for 3s
No EC motor feedback
1. Check DIPB-SW5 and SW6 setting.
2. Check the EC motor.
