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4-3-5.
: Floating Switch detection of fan coil unit Drain Pump
Error number
Fan coil unit display
blue
Green
×
Criteria
∙ Refer to the judgment method below
Cause of problem
∙ Rise in drain board water level or faulty sensor due to malfunction of fan coil unit drain pump
※ Error E153 can only be lifted by resetting the fan coil unit power.
1. How to check
Error occurrence
Yes
After disconnecting the Floating Sensor connector that
is connected to the fan coil unit PCB, is the resistance
value of the two terminals ∞? (opened state)
Yes
Is there a large quantity of water
in the drain board?
Yes
RESET the fan coil unit power and inspect whether
or not the DRAIN PUMP is running (vibration when
running)
Does the DRAIN PUMP work
when COMP is running?
Yes
Is the water level of the DRAIN Pan lowering?
Yes
Normal operation
Duct, cassette (1-Way/2-Way/Mini 4-Way)
1-Way
Yellow
or
green
2-Way
Red
◑
×
×
No
No
Replace DRAIN PUMP
4-Way cassette type
LED Indication
run/stop
Defrost
Timer
or
◑
◑
×
×
No
Reassemble Floating Sensor CONNECTOR and
RESET outdoor unit power
(Fan coil unit power RESET required)
Recurrence of identical error
Yes
Replace fan coil unit PCB
No
DRAIN PUMP PCB terminal
voltage = approx. AC220V?
Yes
Replace DRAIN PUMP
4-33
Circular cassette type
Clean
Filter
Ice
Yellow
Blue
Blue
Green
◑
◑
◑
×
No
Normal operation
Floating Sensor judged as faulty
Replace and then RESET fan coil unit
power
No
Replace fan coil unit PCB
● Float sensor ERROR will be
lifted when the fan coil unit
remote control operates
Trouble shooting
Red
×
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