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8. When Heating does not operate
Operate "Heating Mode(
remote control is higher than one of the indoor temperature by 2°C at
least.
In heating Mode, the indoor fan operates in case the pipe temperature
is higher than 28°C.
• Check the related circuit of RY-4WAY
• Check the indoor room temperature is disconnected or not (about
• Check the indoor pipe temperature is disconnected or not (about
• The details of check are as followings
• Comp Relay.
Check point
Between Micom
(NO.59) and GND
Between IC01M
(NO.11) and GND
• 4 way Relay
Check point
Between Micom
(NO.52) and GND
Between IC02M
(NO.11) and GND
Check the connector of intake and pipe sensor(thermistors)
10KΩ/at 25°C).
5KΩ/at 25°C).
Check the DC voltage on the PWB ASSEMBLY
Comp ON
Comp OFF
DC 5V
DC 0V
Below DC 1V
About DC
12V
4 way ON
4 way OFF
DC 5V
DC 0V
Below DC 1V
About DC 12V
Turn ON Main Power
)" by setting the desired temperature of the
• Outdoor fan Relay
Check point
Between Micom
(NO.53) and GND
Between IC02M
(NO.12) and GND
-53-
Fan ON
Fan OFF
DC 5V
DC 0V
Below DC 1V
About DC 12V
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Troubleshooting
