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7.0 Difficulty
7.2 Fault messages
The UPS displays one of the following screens when it detects an internal fault. See
Section 7.5 which covers obtaining service.

7.2.1 Replace Electronics Unit (EU)

A DC imbalance fault results in bypass operationload
power is lost during a mains failure.
Overheating of the EU results in bypass operationload
power is lost during a mains failure.
Failure of either EU fan while operating on-battery may
cause overheating within the EU. Overheating while on-
battery will result in the loss of load
power. Failure of either fan while operating on-line will
result in bypass operationload power may be lost
during a mains failure.
A battery charger fault results in bypass operationload
power is lost during a mains failure.
A main relay fault results in loss of load power. Remove
the EU to resume load power in bypass modeload
power is lost during a mains failure.

7.2.2 UPS requires service

The UPS may remain operating when this IU fan fault
message is encountered. Schedule UPS service when
convenient.
Do not attempt manual bypass operation when this fault
message is encountered as load power will be lost.
Schedule UPS service when convenient.
If the input voltage tap configuration has been changed, a
qualified technician should reinspect the connectionssee
Section 4.8. An output voltage select fault results in bypass
operationload power is lost during a mains failure.
A bypass relay fault will result in permanent bypass
operationload power is lost during a mains failure.