Hitachi UTOPIA RAS-4HVRP2E - Troubleshooting by Alarm Code

10 Troubleshooting
Troubleshooting procedure
SMGB0136 rev.0 - 07/2021
263
10
10.2.2.2 Troubleshooting by alarm code
Alarm code
01
ActivationoftheIndoorunitprotectiondevice(oatswitch)inindoorunit
• Thealarmcodeisashedonthe7-segmentdisplayoftheoutdoorunit.
• The alarm code is displayed on the wired controller of the indoor unit.
Example of 4-way Cassette Type
This alarm code is displayed when the contact between #1 and #2 of CN14 on the I.U. PCB is opened for more than
120 seconds during the cooling, dry, fan, or heating operation.
Phenomenon
Cause
Check Item
Action (Turn OFF
Main Switch)
Activationofoat
switch
High drain level
Clogging of
drainage
up-slope drain
piping
Check drain pan
Check drainage by pouring
water
Remove foreign particles
clogging the drainage
Replaceoatswitchiffailure
Replace looseness and
replace connector
Repair connection
Replace drain pump if faulty
Replace and tighten connector
Repair connection
Replace it if failure
Check conduction when drain
level is low
Measure resistance by tester
Check connections
Measure voltage between the
terminals for water pump.
Measure resistance by tester
Check connections
Check PCB by self-checking
(*)
Failureoatswitch
Failure drain pump
Failure indoor unit PCB
Incorrect connection
Incorrect connection
Contact failure
Contact failure
Failure
Failure
? NOTE
(*) Refer to the chapter “10.4.2 RSW, DSWs and LEDs functions RAS-(4-6)HV(R/N)(C/P)2E” or “10.4.3 RSW, DSWs and LEDs functions
RAS-(4-6)H(R/N)(C/P)2E”.