That would be "CS", which means low current sense.
CS Current Sense
Current Sense - Indicates control is sensing low current
(Amp) draw. Check components which would allow unit
to run but produce no heat or low heat. Current sense
circuit is active only when using pre-programmed pads.
Time Entry feature will by-pass current sense circuit.
Red wire from cavity T.C.O. must be routed through
current sense loop on H.V. Board.
Possible Causes:
1.
Interlock switch (contacts 2 & 3).
2. Open thermal cut-out (magnetron).
3. Open/loose wire.
4. Power relay.
5. H.V. Board.
6. Magnetron.
7. Diode.
8. Capacitor.
9. Transformer.
10.Triac.
See the full service manual
here.
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