Seaward Supernova - Manual (Page 70)

Power -On Self tests:
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Chapter 4 Tips & Troubleshooting
Power -On Self tests:
When the tester is powered on, a number of messages can possibly
appear as the tester performs safety tests on itself and the mains
power supply.
If a voltage greater than 30V is detected on the neutral input line or
the earth is missing then the following message will be displayed.
LIVE & NEUTRAL INPUT REVERSED REVERSING INTERNALLY
Check for incorrect wiring on supply.
The next test will check for an earth connection. If there is no Earth
connection, the following message will appear.
EARTH CHECK FAILED !!
PRESS THE ENTER
BUTTON IF SAFE
Check for incorrect wiring on supply.
The Tester will fail the earth check if it is being supplied with a
balanced supply (e.g. 55V - 0 - 55V ) since it will detect phase voltage
on both L and N supply connections. Only continue if certain that the
supply is balanced and the earth on the Tester connection is secure.
If all the above is checked the Supernova maybe faulty contact
Seaward for repair
The unit then completes an internal check. If any faults are found
then the following message will be displayed:-
1INTERNAL RELAY FAULT
CANNOT PROCEED !!