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B Contactor Failed to Open
Extra Bytes 2-0: B1 Contactor auxiliary contact indicates the B1 is energized (closed) when it
should be de-energized (open).
Extra Bytes 3-0: B2 Contactor auxiliary contact indicates the B2 is energized (closed) when it
should be de-energized (open).
Extra Bytes 2-0: Check that the B1 contactor de-energizes (opens) when there is no demand to
run.
Check the auxiliary contact on B1. Verify it is properly seated on the contactor and that no
wires have become loose or disconnected.
Check input terminal on Machine Room SRU board to verify that the wire has not become
loose or disconnected.
Check door data to see if all interlocks are being made.
Extra Bytes 3-0: Check that the B2 contactor de-energizes (opens) after relays RGM and DZM
de-energize.
Check the auxiliary contact on B2. Verify it is properly seated on the contactor and that no
wires have become loose or disconnected.
Check input terminal on Machine Room SRU board to verify that the wire has not become
loose or disconnected.
Check door data to see if all interlocks are being made.
M Contactor Failed to Open
The M contactor failed to open.
Check that the M contactor de-energizes (opens) when SF1 relay is de-energized.
Check the auxiliary contact on M contactor. Verify it is properly seated on the contactor and
that no wires have become loose or disconnected.
Check input terminal on Machine Room SRU board to verify that the wire has not become
loose or disconnected.
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