Contact Failure Of Drain Float Switch - Mitsubishi Electric MXZ-4C36NAHZ Service Manual

Check code
5701
Abnormal points and detection methods
<Models equipped with the float switch>
Abnormal if the connector on the drain float switch side CN4F is detected
to be disconnected.
●Diagnosis of defectives
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards
<Models equipped with the float switch>
Disconnect and reconnect the
connector for float switch on
the indoor controller board side,
then turn the power back ON.
Is the check code <5701>
still displayed?
Yes
Check if it is short-circuited
between pins 3–4 of the
connector (CN4F) on the float
switch side.
Is it short-circuited?
OCH573
Models equipped with the float switch

Contact failure of drain float switch

Diagnosis
No
No
Yes
Causes and check points
Contact failure of connector CN4F
Defective indoor controller board
No abnormality.
A connector or wiring contact failure is
suspected.
Replace the connector for float switch.
Replace the indoor controller board.
81
Remedy