12LRN
3 – 3
✩1—The outdoor unit restarts four times before the indoor unit error is displayed (complete shutdown).
✩2—A single error judgment results in the display of the indoor unit error (complete shutdown).
✩3—The outdoor unit restarts eight times before the indoor unit error is displayed (complete shutdown).
[2] AIR TO AIR HEAT PUMP OPERATION IN THERMIS TOR ERROR
1. Indoor unit
29 PAM clock error When power source frequency can-
not be determined (at startup), or
when power source clock cannot
be detected for 1 continuous sec-
ond (at startup).
At compressor startup,
when in operation
Compressor continues
operation without stop-
ping.
None Yes Yes
Item Mode Control operation When resistance
is low (tempera-
ture judged higher
than actual)
Short-circuit When resistance
is high (tempera-
ture judged lower
than actual)
Open-circuit
Room temperature
thermistor (TH1)
Auto Operation mode
judgment
Cooling mode is
activated even if
room temperature
is low.
Cooling mode is
activated in most
cases.
Heating mode is
activated even if
room temperature
is high.
Heating mode is
always activated.
Cooling Frequency control Room becomes too
cold.
Air conditioner
operates in full
power even when
set temperature is
reached.
Room does not
become cool.
Compressor does
not operate.
Dehumidifying Room temperature
memory
Frequency control
Normal operation. Room temperature
is stored in memory
as 31.0C, and
compressor does
not stop.
Normal operation. Room temperature
is stored in memory
as 18.5C, and
compressor does
not operate.
Heating Frequency control Room does not
become warm.
Hot keep status
results immedi-
ately after opera-
tion starts.
Frequency does
not increase above
30 Hz (40 Hz).
Room becomes too
warm.
Air conditioner
operates in full
power even when
set temperature is
reached.
Heat exchanger
thermistor (TH2)
Cooling
Dehumidifying
Freeze prevention Indoor unit evapo-
rator may freeze.
Indoor unit evapo-
rator may freeze.
Compressor stops
occasionally.
Compressor does
not operate.
Heating Cold air prevention Cold air prevention
deactivates too
soon and cold air
discharges.
Compressor oper-
ates at low speed
or stops, and fre-
quency does not
increase.
Cold air prevention
deactivates too
slow.
Cold air prevention
does not deacti-
vate, and indoor
unit fan does not
rotate.
Function Operation Self-diagnosis result
display
Description Detection period Reset condition Indoor
unit error
display
Indoor
unit
Outdoor
unit
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