Resetting outdoor light timer

Yes. Must keep switch turned ON.
Outdoor lights will only come on when motion is detected, otherwise light bulb does not come on. So the indoor wall switch does not work as override since the motion sensor takes over as the sole switch.
Copy following link for wiring illustrations:
http://waterheatertimer.org/How-to-wire-occupancy-switch.html#motion
Other solutions include adding separate motion sensor light nearby and keep porch light so you can turn on-off when desired.
Another option is to add photocell to outdoor light so it turns on automatically at dusk.
Another option is to use outdoor yard timer with dawn-dusk capability:
http://waterheatertimer.org/Woods-timers-and-manuals.html#outdoor
Another option is to replace indoor wall switch with with dawn-dusk timer, that can also be used as ordinary on-off switch so you can turn porch light on-off when desired. Timer such as Intermatic ST01C offers simple 2-wire connection.:
http://waterheatertimer.org/ST01C-program.html
Gene
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If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

T51211BC is 120Volt timer that can be wired many different ways because there are two internal relays, and each relay has NO and NC terminals. One relay is controlled by timer dial trippers, and other relay controlled by dawn-dusk photo eye

Timer wiring cannot be fully explained with words.
Below is basic hook-up for your 120Volt wiring application, and then you can use a tester and experiment with the knob settings, and tripper settings.
http://www.intermatic.com/products/ec%204%20layer/mechanical%20time%20switches/24%20hour%207%20day/t50000%20series%207-day%20time%20switch.aspx

1) You have 4 cables:
one cable from circuit breaker box;
one cable going to photo control;
one cable going to outdoor Load (lite);
one cable going to indoor Load (lite).

2) Cable from circuit breaker has 2 wires:
Black Hot wire connects to terminal 1
White Neutral connects to terminal 2
This will power the clock motor and timer relays.

3) Photocell has 3 wires:
Black connects to terminal 1
White to terminal 2
Red to terminal 3.
Photocell turns relay on-off for Circuit B
Do not mix different size wires under same screw terminal, or smaller wire will come loose over time. Also do not mix stranded wire and solid copper under same screw terminal for same reason.

4) Terminals 4 thru 12 are 'dry'.
Dry terminals receive no power when power is applied to terminals 1 and 2.
To put power on dry terminals, so that Load will have power, attach Black hot wire from breaker to terminals 9 and 12.
So add a jumper wire from terminal 1 to terminal 9 and another jumper wire from terminal 9 to terminal 12.
120Volt power is now connected to terminals 1, 9 and 12

5) Circuit B is dawn to dusk for outdoor Load.
Outdoor load cable has Black and White wire.
Connect outdoor Black wire to either terminal 10 or 11.
To test which is correct for your application, set switch to Auto, and then test across terminals 12 and 11, and across terminal 12 and 10. Repeat test after dark. Rotate knob B to each position and repeat test.
Connect outdoor White wire to terminal 2, and this will complete the circuit.

6) Circuit A is Dusk ON and timer OFF
Indoor cable has Black and White wire.
Connect indoor Black wire to either terminal 7 or 8.
To test which is correct for application, set switch to Auto, and then test across terminals 9 and 8, and across terminal 9 and 7. Repeat test after dark. Rotate knob B and repeat test.
Connect outdoor White wire to terminal 2, and this will complete the circuit.

If outdoor timer is programmable, and does not turn ON automatically at dusk, then timer can be used indoors.
If outdoor timer is activated by photo eye, and turns ON automatically at dusk, then it cannot be used indoors, because the timer turns ON when it senses darkness.
http://waterheatertimer.org/Intermatic-timers-and-manuals.html#HB51

Intermatic make HB51 timer.

If this is not your timer, then add a comment.
To set for ON at dusk, and off 8 hours later, rotate dial to the number 8.
Timer turns on automatically at dusk.
Timer set to 8 hours will start countdown when timer turns ON > and 8 hours later timer will turn off.

Make sure timer is turned away from lights so photo-eye doesn't receive feedback.
Feedback is when the photo eye gets too much light, and then timer thinks it's dawn, so lights turn off, and a moment later photo eye thinks it's dusk again and lights turn on again.
Feedback from lights will cause timer to reset the 8 hour countdown.
A car pulling in the driveway can cause feedback.
If the timer resets because of feedback, it begins the 8 hour countdown again, so the lights will not turn off until dawn.

You can test timer by putting black tape over photo eye, and then timer will turn on.
Set timer for 2 hours for example and then check if timer turned off 2 hours later.

If timer is not functioning correctly, then timer is defective.

manual for HB51RC
http://www.intermatic.com/%7E/media/files/intermatic/products/instructions/timers/hb61rc%20-%20english.ashx
See timer at Amazon
http://www.amazon.com/Intermatic-HB61RC-Digital-Outdoor-Control/dp/B00004W4X5


Plug timer into outlet
Plug lights into timer
Timer turns on automatically at dusk + override lets timer run during daylight hours
Timing cycle repeats each 24 hours
Use selector button to set timer
Timer must be reset after power outage or after unplugging timer.
Rotate selector button and choose one of following

F > Lights are OFF
O > Constant ON
1 through 9 > timer turns ON at dusk and turns OFF 1 to 9 hours later
d > timer turns ON at dusk and OFF at Dawn
1. through 9. > timer turns ON immediately and then turns OFF 1 to 9 hours later
Maximum wattage 1000
50 mini-bulb-string of Christmas lights is 25 watts

I see nothing in the manual that says 'outdoor use only' EXCEPT timer runs on photoelectric eye.
Timer turns ON automatically at dusk, so if timer is inside, and indoor lights are ON, then timer stays OFF.

http://www.intermatic.com/~/media/files/intermatic/products/instructions/timers/hb51rc%20-%20english.ashx

http://www.intermatic.com/products/timers/consumer%20outdoor%20timers/electromechanical%20timers/hb51rc.aspx


To use timer outdoors.
Plug timer into wall.
Timer turns ON automaically at Dusk.
Rotate dial to set how long timer will stay ON.
Set timer to turn OFF 2 4 6 8 Hours after dusk
Set timer to turn off at dawn
Set timer to ON so lights are ON full time
Set timer to OFF so lights are off full time.

http://www.intermatic.com/products/timers/consumer%20outdoor%20timers/electromechanical%20timers/hb51rc.aspx


1. Turn dial selector to the "off" position and
plug timer into three conductor outdoor outlet.
2. Turn dial selector to timing interval
desired (i.e., 2 Hrs, 4 Hrs, 6 Hrs, 8 Hrs,
dusk to dawn, etc.).
3. Plug outdoor lights into Easy-Set™ Timer -
lights will turn on automatically at dusk.
4. Lights turn off 2 4 6 or 8 hours later
depending on dial selection

http://www.intermatic.com/products/timers/consumer%20outdoor%20timers/electromechanical%20timers/hb51rc.aspx

HB51 appears to be an automatic timer
Capacity is 1000Watts
Your lights are on so the circuit has power
I don't see any troubleshooting steps
It gives you a choice how many hours your lights stay on after dusk

You might try changing the selector to a different stay-on hour.
Turn timer off and unplug and then re-plug timer to see if it re-sets.

Otherwise, it looks like the photocell or 'timer brain' stopped functioning.

manual for HB51RC
http://www.intermatic.com/%7E/media/files/intermatic/products/instructions/timers/hb61rc%20-%20english.ashx
See timer at Amazon
http://www.amazon.com/Intermatic-HB61RC-Digital-Outdoor-Control/dp/B00004W4X5

Plug timer into outlet
Plug lights into timer
Timer turns on automatically at dusk unless you set override feature shown below

Timing cycle repeats each 24 hours
Use selector button to set timer
Timer must be reset after power outage or after unplugging timer.
Push selector button and choose one of following

F > Lights are OFF
O > Constant ON
1 through 9 > timer turns ON at dusk and turns OFF 1 to 9 hours later
d > timer turns ON at dusk and OFF at Dawn
1. through 9. > timer turns ON immediately and then turns OFF 1 to 9 hours later
Maximum wattage 1000
50 mini-bulb-string of Christmas lights is 25 watts

From these instructions, you should push button until 6 displays. Timer will turn ON at dusk and turn OFF 6 hours later
If timer.
If you want timer to turn ON immediately and turn OFF 6 hours later, push button until 6. shows in display.

If timer does not display or does not operate correctly, then timer is suspect. Return timer for another one.

manual for HB51RC
http://www.intermatic.com/%7E/media/files/intermatic/products/instructions/timers/hb61rc%20-%20english.ashx
See timer at Amazon
http://www.amazon.com/Intermatic-HB61RC-Digital-Outdoor-Control/dp/B00004W4X5

Plug timer into outlet
Plug lights into timer
Timer turns on automatically at dusk + override lets timer run during daylight hours
Timing cycle repeats each 24 hours
Use selector button to set timer
Timer must be reset after power outage or after unplugging timer.
Push selector button and choose one of following

F > Lights are OFF
O > Constant ON
1 through 9 > timer turns ON at dusk and turns OFF 1 to 9 hours later
d > timer turns ON at dusk and OFF at Dawn
1. through 9. > timer turns ON immediately and then turns OFF 1 to 9 hours later
Maximum wattage 1000
50 mini-bulb-string of Christmas lights is 25 watts