Troubleshooting By Alarm Code - Hitachi RAS-5HVRNM1E Service Manual

8 Troubleshooting
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Troubleshooting by alarm code

01
Alarm code
• The RUN LED flickers and "ALARM" is displayed on the remote control switch.
• The unit number, the alarm code and the unit code are alternately displayed on the set temperature section.
The unit number and the alarm code are displayed on the display of the outdoor unit PCB.
– This alarm code is displayed when the contact between #1 and #2 of CN14 is not closed over 120 seconds during
the cooling process, the heating process or the fan operation.
Phenomenon
Activation of the float switch
Faulty indoor unit PCB
N O T E
• *1): Refer to section 7.3.1, see on page 299 and
RPK), see on page 303.
• Alarm code "01" is not displayed at the RPK series.
207
SMGB0060 rev. 1- 12/2010
Activation of the safety device in the indoor unit
Cause
High Drain Level Clogging of the drainage
Faulty float switch
Faulty contacting
Faulty connection
Check item
Check the drain pan
Check the continuity when
Fault
the drain level is low
Measure the resistance by
means of the tester
Check the connections
Check PCB by means of the
self-check mode *1)
Self-Checking procedure of the Indoor Unit PCB (only for
Action
(Turn OFF the main
switch)
Remove the clogged foreign
particles
Replace the float switch if
faulty
Fix the looseness and
Replace the connector
8
Repair the connection
Replace PCB if faulty