Mitsubishi Electric PUHY-P1000, Service Handbook

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[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
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HWE14040 GB
7-6 Error Code Definitions and Solutions: Codes [4000 - 4999]
7-6-1 Error Code [4102]
1. Error code definition
Open phase
2. Error definition and error detection method

An open phase of the power supply (L1 phase, N phase) was detected at power on.

The L3 phase current is outside of the specified range.

When an open phase is detected (L2-phase or N-phase in the power supply) is detected at the start of operation.
The open phase of the power supply may not always be detected if a power voltage from another circuit is applied.
3. Cause, check method and remedy
Cause Check method and remedy
(1) Power supply problem

Open phase voltage of the power supply

Power supply voltage drop
Check the input voltage to the power supply terminal block TB1.
(2) Noise filter problem

Coil problem

Circuit board failure

Check the coil connections.

Check for coil burnout.

Confirm that the voltage at the CN3 connector is 198 V or
above.

Check that the voltage across pins 3 and 5 on the noise filter
CN4 connector is equal to or greater than 198 volts.
(3) Wiring failure Confirm that the voltage at the control board connector CNAC is
198 V or above.
If the voltage is below 198V, check the wiring connection between
the noise filter board CN3, noise filter board CN2 and control
board CNAC.
Confirm that the wiring between noise filter TB23 and INV board
SC-L3 is put through CT3.
Check the connections of the wire between capacitor board con-
nector CN102 and control board connector CN110.
(4) Blown fuse Check for a blown fuse (F01) on the control board.
→
If a blown fuse is found, check for a short-circuiting or earth fault
of the actuator.
Check that F1 and F2 on the noise filter are not blown.
→
If a blown fuse is found, check for a short-circuiting or earth fault
of the actuator.
(5) CT3 failure Replace the inverter board if this problem is detected after the
compressor has gone into operation.
(6) Control board failure Replace the control board if none of the above is causing the
problem.