Troubleshooting Using Alarm Codes - York HIDS006B21S Service Manual

3.2.2

Troubleshooting Using Alarm Codes

Alarm
Code
l The RUN indicator (red) flashes.
l The indoor unit number (refrigerant cycle number - address number), the alarm code, the model code
1
the model name
number and the alarm code are displayed on the 7-segment display of the outdoor unit PCB.
Note 1: Except for some models.
This alarm code is displayed when the contact between #1 and #2 of CN14 on the I.U. PCB is opened for
over 120 seconds during the cooling, dry, fan, or heating operation.
Turn OFF power supply and remove
connectors CN36 and CN14 on I.U. PCB.
Then turn ON power supply. Is DC12.5~
13.5V applied between CN36 terminals?
Turn OFF power supply and connect
connector CN14 on I.U. PCB. Then
turn ON power supply. Is voltage applied
between CN36 terminals less than 12.5V?
Failure of Condensate Pump
SM-18001-rev.1
Activation of Protection Device (Float Switch) in Indoor Unit
and the number of connected indoor units are displayed on the LCD. The indoor unit
Make sure short circuit does not occur between CN36 terminals
Yes
when measuring the voltage. Short circuit leads to I.U. PCB
malfunction.
Yes
I.U. PCB: Indoor Unit PCB
No
Failure of I.U. PCB
No
Activation of Float Switch FS
or Failure of Float Switch.
Indication on Outdoor Unit PCB
TROUBLESHOOTING
1
Alarm Code
Unit No.
of Malfunctioning Indoor Unit
3-19
,