I have 2 intermatic lamp & appliance programmable timers. On the package the model number says: TN811C and on the timer itself says: TN811. Anyways I have read the instructions and I can't figure out how to work the timer. What's the off/on dial for on the top of the timer. Do the things need to be pushed up to be on or pushed down to be on? I need help. Thanks

http://waterheatertimer.org/Programmable.html#module
http://waterheatertimer.org/Intermatic-timers-and-manuals.html#E1020
Heavy duty E1020 watt timer uses the WG230 clock motor

http://waterheatertimer.org/Programmable.html#st01
ST01 wall timer will handle heavy-amp loads

Gene
Water Heater Timers Save Money

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

http://waterheatertimer.org/Intermatic-timers-and-manuals.html#HB77

Link above has Intermatic manuals
Gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Intermatic TN300 timer is same as Woods 59200 timer
See timer at Amazon
http://www.amazon.com/Intermatic-TN300CL-Indoor-Mechanical-Timer/dp/B001KBZUK8
Timers are sold under different brands and numbers depending on who is packaging and marketing the product.
59300 manual:
http://waterheatertimer.org/pdf/Woods-59200.pdf

Rotate dial to set current time, when plugged in, dial rotates
48 segments located on dial; each segment is 1/2 hour. Push segment down like piano key.
Segment pulled up = lights OFF
Segment down = lights ON
Override switch on top of timer.
For programs to operate, move switch to Timer ON

Plug lamp into timer.
Turn lamp ON
Plug timer into wall

If instructions above don't match your timer, see following page to identify timer:
http://waterheatertimer.org/Woods-timers-and-manuals.html

Intermatic TN300 timer is same as Woods 59200 timer
Timers are sold under different brands and numbers depending on who is packaging and marketing the product.
59300 manual:
http://waterheatertimer.org/pdf/Woods-59200.pdf

Rotate dial to set current time, when plugged in, dial rotates
48 segments located on dial; each segment is 1/2 hour. Push segment down like piano key.
Segment pulled up = lights OFF
Segment down = lights ON
Override switch on top of timer.
For programs to operate, move switch to Timer ON

Plug lamp into timer.
Turn lamp ON
Plug timer into wall

If instructions above don't match your timer, see following page to identify timer:
http://waterheatertimer.org/Woods-timers-and-manuals.html

DT121 Manual
http://www.intermatic.com/~/media/files/intermatic/products/instructions/timers/dt121c%20-%20english.ashx

All Intermatic manuals
http://www.intermatic.com/customer%20service/instruction%20manuals.aspx

Intermatic does not show DT11
Intermatic shows the DT121 is no longer available

If the display shows and you can set programs, then the battery is good.
Does the manual override work? This indicates whether the timer on-off switch operates.
If manual override does not work, then I discovered that timers are no longer any good

Programming:
Set present time
Then set ON time for program 1
Set OFF time for program 1
Then set ON time for program 2
Set OFF time for program 2
Most timers will not function if there is a conflict in programming > for example Program 1 says ON at 6 and OFF at 7 and Program 2 says opposite or has overlapping times
When events are set, press SET once > this will put timer in RUN mode

If manual override works, and you set programming correctly, but timer does not carry out instructions, I guess the timer is no good.

Intermatic has 24 hour timers with 2 on-off per day
http://www.intermatic.com/products/timers/consumer%20indoor%20timers/lamp%20%20appliance%20timers.aspx
Intermatic has 7-day digital timers (all digital timers today are 7 day where you select the day that each program works)
http://www.intermatic.com/products/timers/consumer%20indoor%20timers/digital%20timers.aspx

Intermatic makes a number of programmable wall timers

ST01C & EJ500 & EJ351 programmable wall timers
http://www.intermatic.com/products/timers/consumer%20indoor%20timers/in-wall%20timers.aspx

EI600 sunset-sunrise astronomic
http://www.intermatic.com/products/timers/in-wall%20timers/electronic%207-day%20astro%20time%20switches.aspx

EI500 7 day 7 programs per week
http://www.intermatic.com/products/timers/in-wall%20timers/digital%207-day%20time%20switches.aspx

Go to www.intermatic.com Notice there is a recall for this model timer with codes 40z to 52z. Contact Intermatic for replacement. Here is link to the DT-17C probably same instructions.
http://www.intermatic.com/~/media/files/intermatic/products/instructions/timers/dt17c%20-%20english.ashx

intermatic makes a timer for window air conditioners its the same design and only a few bucks more is more robust . I just tested my 175 mh lamp and it draws 1.9 amps on start up the amps go down after it starts.. harbor freight has a cool timer also (cheap) But please try to buy the timer made in the good old USA ....Jay

http://www.intermatic.com/~/media/files/intermatic/products/instructions/timers/ej351c%20-%20english.ashx
Try this link

I have found the instructions for your model

http://www.intermatic.com/~/media/files/intermatic/products/instructions/timers/hb88rc%20-%20english.ashx

I hope that is this will help resolve your issue