SERVICE MANUAL - Mitsubishi Heavy Industries Ltd.
SERVICE MANUAL - Mitsubishi Heavy Industries Ltd.
SERVICE MANUAL - Mitsubishi Heavy Industries Ltd.
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6 Error display : e8 [Heating overload]<br />
Indoor unit<br />
Outdoor unit<br />
Red LED<br />
1 time flash Red LED<br />
Stays OFF<br />
Green LED Keeps flashing Green LED Keeps flashing<br />
Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only.<br />
Is the air filter clogged?<br />
NO<br />
Are the connections to<br />
the indoor heat exchanger thermistor<br />
OK?<br />
Repair<br />
NO<br />
7 Error display : e9 [Drain trouble]<br />
Indoor unit<br />
Outdoor unit<br />
Red LED<br />
1 time flash Red LED<br />
Stays OFF<br />
Green LED Keeps flashing Green LED Keeps flashing<br />
Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only.<br />
Abnormal data check<br />
in remote controller<br />
Is there any<br />
overflow?<br />
YES<br />
Drain motor ON from<br />
remote controller.<br />
DM<br />
operation<br />
YES<br />
Is drain<br />
piping unclogged?<br />
Is the slop OK?<br />
YES<br />
DM check<br />
YES<br />
YES<br />
● Abnormal Temperature Detection<br />
Abnormal stop<br />
Heating is<br />
possible.<br />
56 63<br />
Indoor unit heat exchanger temp. (˚C)<br />
NO<br />
Are the characteristics of<br />
the indoor heat exchanger thermistor<br />
OK?<br />
NO<br />
NO<br />
Clean it.<br />
NO<br />
Defective indoor unit heat<br />
exchanger thermistor<br />
Replacement<br />
DC 12 V<br />
at both terminals<br />
of CNI?<br />
YES<br />
Float switch check<br />
Correction<br />
- 17 -<br />
NO<br />
Notes (1) Check if the overload state exists or not using the following check points.<br />
Is there a short circuit?<br />
Is the indoor heat exchanger dirty or clogged?<br />
Is the outdoor unit’s fan control normal?<br />
Is the indoor or outdoor air temperature too high?<br />
(2) See the figure page 142 for indoor heat exchanger thermistor characteristics.<br />
YES<br />
((<br />
Check the remote controller for abnormal data.<br />
Does the heating<br />
overload state exist?<br />
Replacement indoor<br />
unit PCB<br />
AC 220/240 V<br />
at both terminals<br />
of CNR?<br />
YES<br />
DM check of<br />
motor wiring<br />
NO<br />
Check the cooling system.<br />
NO<br />
YES<br />
Replacement indoor<br />
unit control PCB<br />
Adjust<br />
● Display condition<br />
An abnormal stop occurs if this state is detected 5 times within 60 minutes of the<br />
first detection, or if the overload state is detected continuously for 6 minutes.
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