Trane 4TVH0086FE000AA Service Manual page 108

Procedure
Number of indoor units set on main PCB
not same as actual number of indoor
Some indoor units are powered off
After re-starting the ODUs and IDUs and
then waiting 2 minutes, an IDU displays
Two or more indoor units are assigned
Setting the indoor units' addresses
uniquely resolves the error
Notes:
1. The number of indoor units can be set on switches EN3 and S12 on the main PCB.
2. Indoor unit error code E1 indicates a communication error between indoor and outdoor unit. Indoor unit error code FE indicates that an indoor unit has not
been assigned an address.
3. Indoor unit addresses can be checked and manually assigned using indoor unit remote/wired controllers. Alternatively, indoor unit addresses can be
automatically assigned by the outdoor unit.
H7
units 1
No
No
an E1 or FE error
2
No
the same address
3
Yes
Change the setting on the PCB to be the
Yes
same as the actual number of indoor
Yes
Power on all indoor units
Refer to indoor unit troubleshooting
Yes
guide. Resolving the indoor unit error
resolves the outdoor unit error
No
Replace outdoor main PCB
107
units
No