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Repair Section
30
7.2 Self-Diagnostic Codes
• Self-diagnostic codes are displayed on the control board under the following conditions and
clear method is as follows.
LCD Display Description Condition Reset/Remedy
Drain tanks are full When the drain tanks are filled with
drain water.
(“TANK FL” LED flashes and signal
output (J106) turns on.)
1)Drain away.
(LCD indicates “TANK”)
2)Press ON/OFF button.
Condensate pump
problem
When (optional) condensate pump
is damaged or broken.
(J8 input of relay board turns to
open and signal output (J106) turns
on.)
1)Fix the condensate pump.
2)Reset the system.
To RESET: Press ON/OFF and
HI/LO buttons on the control box
simultaneously for 5 sec.
Defect (short or open)
of room thermistor
When room thermistor (connecting
to J101) becomes short or open.
(Signal output (J106) turns on.)
Disconnect and reconnect the
room thermistor.
If it doesn’t work, then change it.
Defect (short or open)
of freeze protection
thermistor
When freeze protection thermistor
(connecting to J102) becomes short
or open.
(Signal output (J106) turns on.)
Disconnect and reconnect the
freeze protection thermistor.
If it doesn’t work, then change it.
Show running hours Press ON/OFF and V buttons
simultaneously for 3 sec, total
operation hours of compressor is
indicated by 6-digit (hours).
Example in left: 807 h
After 5 sec., display goes back to
normal mode.
TU
AM
F
SET TEMP
HI
ON
COOL
FAN
F
SET TEMP
HI
ON
COOL
FAN
F
SET TEMP
HI
ON
COOL
FAN
F
SET TEMP
HI
ON
COOL
FAN
F
SET TEMP
HI
ON
COOL
FAN
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