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Check the connector of intake and pipe sensor(thermistors)
• Check the related circuit of R02H(12.1K), R04H(6.2K), R03H(1.0K),
Micom(No. 3, 4).
• Check the indoor room temperature is disconnected or not (about
10KΩ/at 25°C).
• Check the indoor pipe temperature is disconnected or not (about
5KΩ/at 25°C).
Check the DC voltage on the PWB ASS’Y
• The details of check are as followings
CHECK POINT
Between Micom
(No.15) and GND
Between RY-COMP.
(No.1) and (No.4)
Between
CN-COMP2 and
CN-POWER 2(N)
COMP. ON
DC5V
About DC12V
AC 220~240V
COMP. OFF
DC0V
DC0V
Below AC10V
CHECK POINT
Between Micom
(No.13) and GND
Between RY-4WAY
(No.1) and (No.4)
Between CN-4WAY
and
CN-POWER 2(N)
COMP. ON
DC5V
About DC12V
AC 220~240V
COMP. OFF
DC0V
DC0V
Below AC10V
CHECK POINT
Between Micom
(No.14) and GND
Between RY-FAN
(No.1) and (No.4)
Between CN-FAN
and
CN-POWER 2(N)
COMP. ON
DC5V
About DC12V
AC 220~240V
COMP. OFF
DC0V
DC0V
Below AC10V
• Comp Relay.
• 4 way Relay
• Outdoor fan Relay
Turn off Main Power
• Check the electrical wiring diagram of outdoor side.
• Check the abnormal condition for the component of
Compressor/Outdoor Fan Motor, 4 way.
• Check the "open" or "short" of connecting wires between indoor and
outdoor.
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