Hitachi YUTAKI Series - Page 210

Troubleshooting
Service Manual
208
Troubleshooting procedure
SMGB0066 rev.0 - 12/2009
 


– IPM or Dip IPM have detecting function of abnormality.
This alarm is indicated when the transistor module detect the abnormality 3 times in 30 minutes including 3. Retry
operation is performed up to the occurrence of 2 times. (The compressor restarts automatically in 3 min.)
Conditions:
Abnormal current to the transistor module such as
Short circuited or grounded
or
Abnormal temperature of the IPM or Dip IPM
or
Control voltage decrease

*1)Performthehighvoltagedischargeworkbyreferringtothesection"Checkingprocedureformainparts".beforechecking
and replacing the inverter components.
*2)TurnONtheNo.1switchofthedipswitchDSW1onInverterPCBwhenrestartingwithdisconnectingtheterminalsofthe
compressor.Aftertroubleshooting,turnOFFtheNo.1switchofthedipswitchDSW1onInverterPCB.
*3)Usethesilicongreaseprovidedasaccessory(ServicepartsNo.P22760).

note
When alarm code “53” is indicated, the fan motor (DC motor) ensure that DC fan motor is checked according to -
the section "Fault diagnosis of DC fan motor".
Turnoffpower,disconnect
U,V,Wfromcompressor
terminals and restart.
Does the protecting function
activate?*2)
No
Check the ISPM or Dip
IPM.*1)
Check the compressor.
(If there is a short-circuit
betweenphaselines,replace
the compressor.)
Yes
Yes
Faulty
No
No
Replace ISPM or Dip IPM
Coat the silicon grease to all
the touched face between
the ISPM or DIP-IPM and the
radiatednfully.*3)
Is the silicon grease coated all
over between the ISPM or Dip
IPMandtheradiatedn?
Good
Yes
Is the air side heat
exchanger of outdoor unit
clogged?
Remove clogging.
Replace the ISPM or Dip IPM