Input Overcurrent Detection - Daikin H Series Service Manual

Troubleshooting

4.12 Input Overcurrent Detection

E8
Remote
Controller
Display
Method of
An input overcurrent is detected by checking the input current value with the compressor running.
Malfunction
Detection
 The current exceeds 20 A for 2.5 seconds with the compressor running.
Malfunction
Decision
Conditions
 Defective compressor
Supposed
 Defective power module
Causes
 Defective outdoor unit PCB
 Short circuit
Troubleshooting
Check No.15
Refer to P.114
Check No.17
Refer to P.117
Check No.18
Refer to P.118
Service Diagnosis
(The upper limit of the current decreases when the outdoor temperature exceeds a certain
level.)
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
∗ An input overcurrent may result from incorrect internal wiring. If the system is interrupted by an input
overcurrent after the wires have been disconnected and reconnected for part replacement, check the
wiring again.
Check No. 17
Check the installation condition.
Start operation and measure the
input current.
Input current flowing
above its stop level?
YES
Turn off the power and disconnect
the harnesses U, V, and W.
Check No. 15
Check with the inverter checker (∗).
Any LED off?
NO
Turn off the power, and reconnect
the harnesses. Turn on the power
again and start operation.
Check No. 18
Check the discharge pressure.
NO
∗ Inverter checker
Part No.: 1225477
YES
SiUS04-924_A
Replace the outdoor unit
PCB.
Correct the power supply or
replace the PM1.
(Replace the outdoor unit
PCB.)
(R14701)
85