Troubleshooting
Service Manual
188
Troubleshooting procedure
SMGB0066 rev.0 - 12/2009
Alarm code
description
Excessively low voltage or excessively high voltage for the inverter
rHUE-(5/6)AHn
• The alarm code is displayed on the PCB´s display of the outdoor unit.
• The alarm appears after 3 retries during 30 minutes.
– This alarm code is displayed when the voltage between terminal "P" and "N" of ISPM is insufficient.
retry code: P-18
warning
Electrical hazard. Risk of electrical shock. Be extremely carefull because of the high voltage
-
.
*1): If the capacitor has a high voltage, perform the high-voltage discharge pocedure. Refer to section "RHUE-(5/6)AHN:
Procedure for checking the ISPM".
*2): Checking procedures of the diode module are displayed in item "RHUE-(5/6)AHN: Procedure for checking the ISPM".
*3): DC voltage measuring position: ISPM "P" terminal to "+" terminal of tester, "N" terminal to "-" terminal of tester
measuring position: DC 1000V.
Is the Power Supply voltage
400V ±10%?
No
Yes
No
Yes
Is connection correctly
between ISPM and reactor
(PCL) with capacitors (CB1,2)
or CMC?
No
No
Yes
Is the LED201 on ISPM ON?
Restart the operation
Is the voltage over 340V
during operation?
Yes
Does the voltage fall during
the operation because of the
operation of other apparatus?
Yes
No
No
Is the DC voltage over 460V?
Check the wiring and the
cable capacity
Check the wiring ISPM and
capacitors (CB1,2) *2).
In case the wiring is correct,
replace the ISPM
Faulty ISPM. Replace it.
Check capacitors (CB1,2).
Yes
Normal
Faulty
Replace the capacitors.
Capacitors have high voltage.
Be extremely careful *1)
.
Connect correctly.
How is the
compressor
operation?
Faulty ISPM.
Replace it.
Compressor stops when
frequency increases.
(Aprox. 30 Hz to 60 Hz)
Compressor stops
immediately.
(Lower than 30 Hz)
Frequency can increase
higher than 60 Hz
