8 Troubleshooting
268
SMGB0064 rev.0 - 08/2011
Alarm code
53
Activation for protecting the ISPM (RAS-(3-6)HRNM2E for IVX Series
• The RUN LED ickers and “ALARM” is displayed on the remote control switch.
• The unit number, the alarm code and the unit code are alternately displayed on the set temperature section. The unit
number and the alarm code are displayed on the display of the outdoor unit PCB.
- ISPM has a detection function of the abnormal operation. This alarm is displayed when the ISPM module detects
the abnormal operation 7 times or more than 7 times in 30 minutes. The retry operation is performed six times.
Conditions:
• The abnormal current to the ISPM, such as short-circuited, grounded, overcurrent or control voltage decrease.
Turn off power, disconnect
U, V, W from compressor
terminals and restart.
Does the protecting function
activate? *2)
Check the transistor
module. *1)
Check the compressor.
(If there is a short-circuit
between phase lines, replace
the compressor)
Yes
Yes
Faulty
No
No
Replace the transistor
module
Good
Yes
Is the heat exchanger
of outdoor unit clogged?
Remove clogging.
Replace the ISPM
Is the fixed screw on
ISPM loosened?
Loosen
Tighten the screw correctly.
N O T E
• *1) Regarding replacing or checking method for ISPM, refer to item Procedure of checking other main parts for
ES Series, see on page 312.
• *2) Set the #1 pin of DIP switch on ISPM to ON when you are restarting with the terminals of the compressor
disconnected. After the troubleshooting, set #1 pin of DIP switch DSW1 on ISPM to OFF.
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