Hitachi RAS-25SX8 Service Manual page 197

Checking the indoor unit electrical installation
Introduction
First check the failure phenomenon and status, and then move on to elaborate diagnosis.
Initiating troubleshooting
Is the "timer lamp" (orange) of the indoor unit blinking?
Is the "monitoring lamp" (yellow) of the indoor unit
blinking?
Turn off the power, wait at least 5 seconds, turn it back on, and observe the way the horizontal vanes move for about
30 seconds.
Check 1: Have the horizontal vanes moved? (Yes/No)
Set the remote control unit to cooling mode, temperature setting 16
32 (winter) and operate the product.
Check 2: Has the product received the remote control signal and has the "operation lamp" gone on? (Yes/No)
If you responded "Yes" to Check 2:
Check 3: Is the compressor of the outdoor unit running? (Yes/No)
If you responded "No" to Check 2:
Check 4: Does the "emergency operation switch" work? (Yes/No)
Check results and next check items
Check 1 Check 2
No No
Yes No
Yes Yes
No
No
Check 3 Check 4
No
Yes
No
Yes
Move on to "the timer lamp blinks."
(Pages 250 and subsequent.)
Yes
Go on to "checking the electrical installation
of the outdoor unit." (page 262.)
(summer), heating mode, temperature setting
Go on to "The power will not become turned on."
(page 232)
Go on to "The product will not receive the remote
control signal." (page 234)
Go on to "The compressor will not run." (page 240)
– 230 –
Next check item