Trane A5HL5036A1000A - Page 47

A5HL5-SF-1A-EN
47
F8 - 4-Way Value Reversing Abnormal
On heating mode, if the IDU Coil temperature is lower than Room temperature 41°F or more after compressor is on for 8 minutes, the unit will
show F8 code.
The 4-way valve
wiring connection
correct?
No
Yes
No
F8 disappear?
Yes
Is there over 187V
voltage on the 4-
way valve?
No
Test the valve coil
resistance with a
multimeter, does it
open or short circuit?
No
Yes
Yes
No
F8 disappear?
Yes
End
Replace ODU PCB
Replace 4-way valve coil
Re-connect
Display F8