24
AH-S22DP2
AH-S25DP2
AH-S32DP2
BREAK DOWN DIAGNOSIS PROCEDURE
Self-diagnostic procedure using display mode. If the timer lamp blinksduringoperation, the problem can be diagnosed using the
following table.
: Blinks at 2-second intervals
: OFF
: ON
: Blinks 3 times at 0.2-second intervals
Indoor and outdoor unit
completely stopped
Display by indoor unit operation lamp
Displayed in a pattern which comes on at the same
time as the timer lamp
4 seconds off
Temp. display
What to check, procedure
Display by
outdoor
unit lamp
LED 1
Diagnosis
Solution
Condition
of indoor
and
outdoor
unit
Normal
Once
Twice
3 times
4 times
5 times
6 times
7 times
Compressor lock error
DC overcurrent error
AC overcurrent error
Normal
Does compressor active ? Does it go off immediately after active ?
1. Check the circuit in the power transistor module.
2. Is the outdoor fan revolving ?
1. Is the discharge outlet of the outdoor unit clogged ?
1. Measure the resistance of thermistor TH2 on the outdoor unit
(see Figure 2).
1. Replace power transistor
module
1. Clear the discharge outlet.
Overheat of the comp-
ressor error
(protector operating) or
outdoor compressor
thermistor TH1 short
1. Replace the outdoor control board
assembly
(Current transformer wire break.)
1. Reattach.
2. Replace the outdoor thermistor
assembly.
1. Replace the outdoor thermistor
assembly.
1. Clear the discharge outlet.
2.
Assure power supply voltage.
3. Refill to rated amount.
4. Replace the outdoor ther-mistor
assembly.
5. Replace the indoor control
board
assembly or only TH2.
1. Apply an external shock to the
compressor.
2. Replace the compressor.
1. Can voltage be detected at the current transformer on the outdoor
unit control board?
1. Are the connectors of the outdoor unit thermistors well attached ?
2. Measure the resistance of thermistors TH1 and TH2 on the
outdoor unit (see Figure 2).
1. Is the discharge outlet of the outdoor unit clogged ?
2. Is the power supply voltage at least 198 V at full power operation ?
3. Check for refrigerant leaks at the tubing connections.
4. Measure the resistance of compressor thermistor TH1 on the
outdoor unit (see Figure 2).
5. Measure the resistance of heat exchanger pipe thermistor TH2 on
the indoor unit (see Figure 1).
AC abnormal current
error
Open circuit of the
thermistor error
Short circuit of the
thermistor error
1. Retry to connect short wire.
2. Replace the short wire.
10 times
Out terminal board
thermal fuse operation
1. Check the CN9 and short wire.
