Error Code 4102 - Mitsubishi Electric PQHY-P72TYHMU-A Service Handbook

[ IX Troubleshooting ]
1. Error Code
4102 (THMU-A)
Open phase
2. Error definition and error detection method
ŒAn open phase of the power supply (L1 phase, L2 phase) was detected at power on.
ŒThe 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
ŒOpen phase voltage of the power supply
ŒPower supply voltage drop
(2) Noise filter problem
ŒCoil problem
ŒCircuit board failure
(3) Wiring failure
(4) Blown fuse
(5) CT3 failure
(6) Control board failure
HWE09080
Check method and remedy
Check the input voltage to the power supply terminal block TB1.
ŒCheck the coil connections.
ŒCheck for coil burnout.
ŒConfirm 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 TB23 and INV board SC-T is put
through CT3.
Check that F01 on the control board is not blown.
->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.
- 244 - GB