Hello Jacqueline. Welcome! We were discussing this electric mower service problem in another thread. The problem is probably more related to finding an electrical technician within the Cub Cadet network than it is related to your location. There are tons of techs who have been tinkering with small engines since they were kids, and can be easily trained to be service technicians for gasoline powered mowers. The number of potential techs who have been tinkering with electric or electronic machines who want to work on mowers instead of computers, or robots is in short supply.
When was the last time the tractor started and operated properly?
From the Cub Cadet website, there is a 3 year residential-use warranty, so at 10 months, let's hope you will be covered.
From what I have been able to learn from the few details online, that light might mean to read the fine manual. (The bold is not directed at you, it is a reminiscence of days gone by on this forum, or a past incarnation anyway.) Or that light might indicate that mowing in reverse is enabled. Have you read the mower manual carefully to see if it includes details on anything that you may have done in error? Possibly charging or not charging the battery incorrectly? The battery charger supposedly came with a manual that I have not found online. Read that one too.
I see a notation in the manual that the machine cannot be started unless the key is fully inserted. Could it be getting stuck partially in?
The next item of interest is the Safety Interlock System.
From the manual:
• The safety interlock system prevents the operator from turning the tractor
ON unless the operator is in the seat with the parking brake engaged or
brake pedal fully depressed and the drive pedal in the neutral position.
• The tractor will not operate with the charger cord plugged into the charging
port and/or the charging port cover open or removed.
• The tractor will automatically shut off the blade(s) and drive motors if the
operator leaves the seat.
Are you meeting the criteria they set forth here?
1)Seated on the mower
2)Parking brake engaged
3)Brake pedal fully depressed
4)Drive pedal in neutral
5) Charger disconnected from tractor
6)Charging port cover in place and closed
7) Not mentioned in the manual is likely that the blade PTO be disengaged (press yellow PTO button , hold for one second, light goes on-PTO is engaged. Press and hold for one second again, light goes out, and PTO is disengaged.
The triangle light's primary purpose is to indicate when the tractor is in Reverse Caution Mode which allows backing while blades are engaged. Press and hold the triangle button for three seconds, the light comes on, and RCM is enabled. Press, and hold triangle for another three seconds and RCM is disabled and light goes out. Similar criteria to starting must also be met to enable RCM.
Is there an image of a blade cutting grass with the flashing triangle? If so, the tractor thinks there is a blockage at a blade motor that needs to be cleared.
Has the battery become fully discharged?
Suggestions:
-Hold the triangle button for three seconds to see if it stops flashing.
-There may be a "secret" reset if you hold the triangle button for longer than three seconds. Try.
-Do you have a way to fully remove power to the tractor, like a disconnect, or a battery connector that could be separated? If so, try opening the connection to cycle power (think computer reboot). Try for at least 15 minutes, possibly an hour or even a few.
These require an electrical meter and testing which might void whatever warranty remains:
-Test the switch that determines the parking brake is on
-Test the switch that determines if the operator is in the seat
-Test the PTO on/off switch
-Test the RCM switch
-Test the forward/NEUTRAL/reverse pedal potentiometer- it may not see neutral
Items noticed in the manual:
They do not want the operator to leave the seat with the blade PTO engaged, so I suspect it might cause confusion in the electrical components in addition to being a safety hazard.
Nowhere do they mention a flashing RCM light. It may be a troubleshooting feature that they are keeping to themselves.