ERROR CODES AND TROUBLESHOOTING
PAGE 38
ENGLISH
Error Codes and Troubleshooting
Yes
Yes
Yes
Start
No
No
No
No
No
Line voltage at AC-L & AC-N
on the PCB (CN2 & CN1)?
Line voltage at AC-L & AC-N
on the IPM (24K/30K/36K
CN1 & CN2)?
Module Power voltage -
CN22 on the PCB:
Across pins 1 & 2 = 5VDC
Across pins 2 & 3 = 15VDC?
Module Power voltage -
CN10 on the IPM
Across pins 1 & 2 = 5VDC
Across pins 2 & 3 = 15VDC?
Module Com voltage - CN23 on the PCB
With a call for Heating or Cooling,
Across pins 1 & 2 = 5VDC
Across pins 2 & 3 = 15VDC ?
Module Com voltage - CN11 on the IPM
With a call for Heating or Cooling,
Across pins 1 & 2 = 5VDC
Across pins 2 & 3 = 15VDC?
Yes
Yes
Yes
No
Yes
No
Yes
No
Check incoming power
from building
Replace PCB
Replace
PCB
Replace fuse
Replace CN9 and CN10
wiring harness
Replace module power
wiring harness
Replace
PCB
Replace
IPM
Fuse 1 is OK?
Line voltage at
AC-L OUT & AC-N
OUT on the PCB
(CN8 & CN9)?
Error Code
(Indoor/Outdoor)
F3/LED1: 4 Flash
Communication Fault Between IPM and
Outdoor PCB
Complete the “Check This First” Flow
Chart before continuing.
Models:
AW24TL2HFA
AW30TL2HFA
AW36TL2HFA
ASYW24TRDFA
ASYW30TRDFA
ASYW36TRDFA
1U24TL2HFA
1U3036TL2HFA
ASH124TRDFA
ASH3036TRDFA
Replace module COM
wiring harness
See following page
for wiring diagram and
relevant color-coded
test positions.
