I bought the heavy duty appliance timer SA110, 15 amps for my hotwater solar heater. I followed the instuctions and the timer never worked. I bought this timer for the pump the pumps the water from the heater to the solar panel to only work during the day (on at 8am) and to shut off in the evening (off at 6pm) to conserve electric. I did this because there is no reason for the pump to be running when the sun is not out. I used to just unplug it at night, but would always forget to replug before leaving to work the next day. A friend talked me into buying this timer. Now I come home from work to cold water. What am I doing wrong? Is this timer not made for hotwater heaters? The pump plugs into a regular wall socket. Timer pins are up at night, down for daytime, switch is turned to timer. What am I doing wrong? Thank you very much for your time, Aloha, Lori

It sounds like you have the timer set correctly.
Manual says to set Master switch to ON position to make settings
Timer has lifetime warranty

Open following link to identify timer and download manual:
http://waterheatertimer.org/Sylvania-timers-and-manuals.html

This timer is rated 120Volt 1800W incandescent 1/2 HP
If your pump rating plate shows excess of 1/2 HP, then this timer is not heavy enough.
Timer comes with lifetime warranty against workmanship, which is far superior than any other timer I've seen on the market, and I test and research timers each day.

Manual says to set Master switch to ON position to make settings.
After settings are made, manual says to move Master switch to Timer for timed functions, as you have done

Next thing to look for: if timer dial rotates as time passes, and keeps correct time.

The timer dial is a clock. The segments located around dial are pushed down or pushed up to control on-off operation.
As the dial rotates, the segments push a switch that turns Load on-off.
If you want timer ON for 2 hours, then you push down 8 consecutive segments.
If you want timer ON for 8 hours, then you push down 32 consecutive segments.

Plug ordinary lamp into timer, and turn lamp ON, and then manually rotate timer dial to see if lamp turns on-off. This will give you a baseline for timer operation, and then you can assess if the motor has suddenly malfunctioned, or breaker is tripped, etc.

Intermatic makes a heavy-duty plug-in timer, and the ratings are identical to your Sylvania SA110
http://www.intermatic.com/products/timers/consumer%20outdoor%20timers/electromechanical%20timers/hb31r.aspx