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9. TROUBLESHOOTING
Both the indoor unit and outdoor unit include electronic control circuits. Be sure to
pay attention to the following before inspecting or repairing the outdoor-side
electronic circuits.
High-capacity electrolytic capacitors are used inside the outdoor unit controller (inverter). They retain an
electrical charge (charging voltage DC 311 V) even after the power is turned OFF, and some time is required
for the charge to dissipate.
Be careful not to touch any electrified parts before the control circuit board LED (red) turns OFF.
If the outdoor control circuit board is normal, approximately 60 seconds will be required for the charge to
dissipate. However, allow at least 30 minutes for the charge to dissipate if it is thought there might be trouble
with the outdoor control circuit board.
(If the outdoor control circuit board fuse has blown, approximately 30 minutes will be required to discharge
the high-capacity electrolytic capacitors.)
Trouble diagnostics contents
1 Conditions that do not represent trouble
2 Outdoor unit trouble diagnostics
3 Checking the outdoor unit
4 Unit problems and inspection points
Inspection points for each part
5 Explanation of functions
9-1. Conditions That Do Not Represent Trouble
Inquiry from customer
1 When the room temperature
reaches the desired
temperature
When HEAT operation is in progress in other rooms, HEAT
operation occurs at a "LL" (very low) fan speed even after the
desired room temperature has been reached.
27
Explanation
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