No loop current

the timer control panel is getting bad.

Most microwaves will have a spring loaded latch on the door. The likely issue is the clip for the spring has broken. Unplug it, put it on the benchtop and pry open the inside of the door. It's usually a soft plastic cover that with a gentle persuasion from a flat screwdriver will come off. Start above the latch and pry open as much ad needed. Locate the spring at the bottom, open up one of the fixing loops on the ends with long nose pliers and attach it to a fixed spot around the inside of the door. There are usually metal ribs inside the door and attach the other loop to the base of the latch

If you would like to email them, they have a form on this page:
http://www.generalmills.com/ContactUs.aspx

Below is other contact information for General Mills
By Telephone: Please call us at 1-800-248-7310 between (7:30 a.m. - 5:30 p.m. CT, weekdays)By Fax:Please send your fax to1-763-764-8330.By Letter:You can send us a letter at our mailing address:General Mills, Inc.
P.O. Box 9452
Minneapolis, MN 55440

See if your line is poor

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.

You can find helpful exploded view diagrams and order parts by entering your full model number here.

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PF = Power failure. Try and push the clear or cancel button (or start, or clock etc) You may have missed one. If that doesn't work try and unplug it for 10 seconds or so and retry.

check the door latches inside the oven, open the housing and spray some lubricants on the latches.

need a solution

There is something on the secondary side which is drawing too much current. I would check all electrolytic capacitors, zener diodes, transistors, and voltage regulators.