Hitachi Utopia PAS-3HVRG, Руководство по обслуживанию

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TROUBLESHOOTING
“RUN” light flickers and “ALARM” is indicated on the remote control switch.
The unit No., alarm code and the unit code is alternately indicated on the set temperature section,
and the alarm code is indicated on the display of the outdoor unit PCB.
ISPM have detecting function of abnormality.
This alarm is indicated when the any alarm code of 51, 52, 53 and 54 occurs the abnormality 3 times
in 30 minutes including 3. Retry operation is performed up to the occurrence of 2 times.
Conditions: Abnormal Current to the ISPM such as Short Circuited or Grounded
or
Abnormal Temperature of the ISPM
or
Control Voltage Decrease
1*): Before replacing the ISPM, refer to item 1.3.3 (1) regarding electrical discharge.
2*): Regarding the checking of the ISPM, refer to item 1.3.3 (2).
3*): Turn ON the No.1 switch of the dip switch DSW1 on ISPM when restarting with disconnecting the terminals of
the compressor. After troubleshooting, turn OFF the No.1 switch of the dip switch DSW1 on ISPM.
4*): Silicone grease (P22760) is available as a spare parts.
Alarm
Code
Protection Activation of ISPM
Yes
Yes
Yes
Turn off power, disconnect
U, V, W from compressor
terminals and restart.
Does the protecting function
activate? *3)
Check the ISPM. *1) *2)
Is the silicon grease coated
securely between ISPM and
fin? Is the fixing screw of
ISPM loosen?
Good
No
Is the heat exchanger of
outdoor unit clogged?
No
No
Faulty
Check the compressor.
(If there is a short-circuit
between phase lines,
replace the compressor.)
Apply the silicon grease
between ISPM and fin
securely. *4)
Replace the ISPM.
Remove clogging.
Replace the ISPM.