Trane TVR Pro CO Series Service Manual page 68

2.7 E8: Outdoor unit address error
Digital display output
Description
 Outdoor unit address error.
 All units stop running.
 Error code is only displayed on the unit with the error.
Trigger / recover condition
 Trigger condition: Outdoor unit address is set more than 2.
 Recover condition: Outdoor unit addresses are set from 0 to 2.
 Reset method: Manually restart.
Possible causes
 Invalid outdoor unit address.
 Main PCB damaged.
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