8 Troubleshooting
265
SMGB0087 rev.0 - 12/2013
8
Alarm code
53
Activation of transistor module (RAS-(2-2.5)HVNP1 / RAS-3HVNC1)
- 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.
Remove clogging
Turn off power,
disconnect U, V, W
from compressor
terminals and restart.
Does the protecting
function activate? *2)
Is the heat
exchanger of outdoor
unit clogged?
Yes
No
Check the compressor.
(If there is a short-circuit between
phase lines, replace the compressor)
Yes
Replace electrical box
No
N O T E
• *1) Regarding replacing or checking method for ISPM, refer to item Procedure of checking other main parts.
• *2) Set the nubmer 1 pin of DIP switch on ISPM to ON when you are restarting with the terminals of the compressor
disconnected. After the troubleshooting, set number 1 pin of DIP switch DSW1 on ISPM to OFF.
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