Mitsubishi Electric PUHY-HP144TSHMU-A Service Handbook page 141

[ IX Troubleshooting ]
1. Error Code
4102
Open phase
2. Error definition and error detection method
An open phase of the power supply (L1 phase, L2 phase) was detected at power on.
The L3 phase current is outside of the specified range.
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
(1) Power supply problem
Open phase voltage of the power supply
Power supply voltage drop
(2) Noise filter problem
Coil (L1 - L3) problem
Circuit board failure
(3) Wiring failure
(4) Blown fuse
(5) CT3 failure
(6) Control board failure
HWE0716A
Check method and remedy
Check the input voltage to the power supply terminal block TB1.
Check the coil connections.
Check for coil burnout.
Confirm that the voltage at the CN02 connector is 188 V or
above.
Confirm that the voltage at the control board connector CNAC is
188 V or above.
If the voltage is below 188V, check the wiring connection between
the noise filter board CN02 and control board CNAC.
Confirm that the wiring between the coil L3 and TB23 is put
through ACCT3.
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.
Replace the inverter if this problem is detected after the compres-
sor has gone into operation.
Replace the control board if none of the above is causing the
problem.
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