Midea MSE-18CR Technical & Service Manual

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8.3 Diagnostic Chart
8.3.1 After energizing, no indicator is lighted and the air conditioner can’t be operated.
Yes
Yes No
No Yes
Yes
No
8.3.2 Resetting phenomenon often occurs during operation. (That is automatically entering to the status when
power is on.)
The reason is that the instantaneous voltage of main chip is less than 4.5V. Check according to the following procedure:
Yes
No Yes
No
A
fter energizing, the air conditione
r
can’t be operated
Check if AC220V power supply outputs to Indoor PCB.
Check if AC220V exists at the primary coil of transformer.
Indoor PCB is defective
Check if AC14.5V exists at the secondary coil of transformer.
Take off the secondary plug of transformer, and then check i
f
A
C14.5V exists at the secondary coil of transformer.
The transformer is defective. Indoor PCB is defective
Resetting phenomenon often occurs during operation.
A
fter changing indoor fan motor, check if the failure releases.
Indoor PCB is defective
Power supply circuit has problems.
A
fter changing Indoor PCB, check if the failure releases.

Midea MSE-18CR Specifications

General

Brand	Midea
Model	MSE-18CR
Category	Air Conditioner
Language	English