[3] Self-diagnosis and Countermeasures Depending on the Check Code Displayed

(1) Mechanical

Checking code

Meaning, detecting method

 

Cause

Checking method & Countermeasure

 

 

 

 

 

0403

Serial

If serial transmission cannot be

1)

Wiring is defective.

Check 1, the connections, 2, contact

 

transmission

established between the MAIN and

 

 

at the connectors and 3, for broken

 

abnormality

INV boards.

 

 

wires in the following wiring.

 

 

 

 

 

CNRS2 - CNRS3

 

 

 

 

 

CNAC2 - TB1B

 

 

 

2) Switches are set wrong on the INV

SW1-4 on the INV board should be

 

 

 

 

board.

OFF.

 

 

 

3)

A fuse (F01) on the INV board is

If the fuse is melted, (if the resistance

 

 

 

 

defective.

between the both ends of fuse is ∞ ),

 

 

 

 

 

replace the fuse.

 

 

 

4) The circuit board is defective.

If none of the items in 1) to 3) is appli-

 

 

 

 

 

cable, and if the trouble reappears even

 

 

 

 

 

after the power is switched on again,

 

 

 

 

 

replace the circuit board by the follow-

 

 

 

 

 

ing procedure (when replacing the cir-

 

 

 

 

 

cuit board, be sure to connect all the

 

 

 

 

 

connectors, ground wires, etc. se-

 

 

 

 

 

curely).

 

 

 

 

 

1 If serial transmission is restored af-

 

 

 

 

 

ter the INV board only is replaced,

 

 

 

 

 

then the INV board is defective.

 

 

 

 

 

2 If serial transmission is not restored,

 

 

 

 

 

reinstall the INV board and replace

 

 

 

 

 

the MAIN board. If serial transmis-

 

 

 

 

 

sion is restored, the MAIN board is

 

 

 

 

 

defective.

 

 

 

 

 

3 If serial transmission is not restored

 

 

 

 

 

by 1 and 2 above, replace both

 

 

 

 

 

boards.

 

 

 

 

 

 

–104–

Page 105 Page 107
Page 106
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Mitsubishi Electronics P500YMF-C, PURY-P400 specifications Mechanical, CNRS2 CNRS3, CNAC2 TB1B
Page 105 Page 107

PURY-P400, P500YMF-C specifications

Mitsubishi Electronics has long been a leader in the HVAC industry, known for its innovative technology and reliable performance. Among its notable offerings are the P500YMF-C and PURY-P400 models, designed to address the diverse needs of commercial and residential applications.

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