Hitachi RAC-18SX8 Service Manual page 221

11. Timer lamp blinking: blinking 5 times
[Situation] The timer lamp blinks 5 times while the product was stopped.
[Estimated failure location] ・Fused contact in the power relay
[Caution] ・The failure display is given if the power relay contact has refused to be turned off for 24
consecutive hours while the product is stopped.
[Diagnosis flow]
Initiating troubleshooting
Turn off the power and check for continuity
between power relay contacts.
Is the resistance almost 0
Replace the "indoor electrical installation."
Ω ?
Yes
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