Mine is turning off and on every 2-3 min???

Programing:
Set Time
Press and hold OK for 2 sec.
When the Day flashes, press + or - to set the day.
Press OK - it moves to the hour.
Do the same for hour, min.
When done, press Menu.
Set Timer
there are 16 different times you can set. Most people will use 1.
Press Menu, the 1 on flashes. We will set that setting.
Press OK to select 1 On, the week day flashes. The first selection is ALL days. Use the + or - to set day.
Press OK, the hour flashes. Use the + or - to set hour.
Do the same for min. The 1 off flashes.
Set the off time.
When done, press menu.
Rcl button
Press Menu and select the on/off setting you want to delete.
Press Rcl. It clears it
Press Rcl. again, and it will restore the old setting.
Turn on manually
Press + to change from
Auto OFF (timer is on, light off)
ON (light is ON)
Auto ON (timer is on, light on)
OFF (it's off)
Daylight Savings Time
Press Rcl to activate DST. +1H displays.
RND Random
Turns lights on and off within 30 min of your time - for a "random" appearance.
Press RND to turn it on/off.
There is a countdown setting too - not sure why anyone would use it.
Press Menu twice. CTD displays.
You can set the time interval from 99hrs out.
Click OK to confirm. The CTD flashes during countdown.
You can set it to turn on or off.

Assuming it is not hardware but soft settings...
1) Check and make sure that your TV does not have the timer set.
The Timer feature allows you to set a day and time for the TV to turn on automatically and the device and channel to display when it switches on. If the TV is already on at the requested time, the TV automatically tunes to the channel you designated in the Timer menu.
When the Timer turns on the TV, the following message is displayed: "Press a button for the TV to stay on." Press any button on the remote control within five minutes if you wish the TV to remain on.
Note: The TV clock must be set before you can use the
Timer feature (see preceding page to set the clock).
On/Off
Press down arrow / up arrow to enable or disable the Timer.
2) If not working, try SYSTEM RESET. Press SYSTEM RESET button on the front panel with pointed object (e.g. straight paperclip). TV turns off, green LED flashes for about 1 minute. When it stops flashing turn the TV on again. All settings other than Parental Lock need to be set again using the manual.
3) TV RESET. If all else fails for soft error. Your manual describes this last resort for soft type error. It could be hardware problem needing more expertise.
Manual can be viewed on a computer at
http://www.audiolabga.com/pdf/V32-V32L_Service_Manual.pdf

To set the time;
Press and hold the TIME button during the time setting procedure. While holding the time button press DAY to set the correct day and HR to set the correct hour (make sure the am/pm is correct) and then MIN to set the correct minutes. (If you hold down the Day/Hr/Min button for more than 2 seconds it will give a fast run-through)

Omron:
https://www.ia.omron.com/support/
http://waterheatertimer.org/pdf/h5cx_sell-sheet-wiring.pdf

I believe you have 230Volt 50 Hz electric power.
Omron is rated 50-60 hz
US timers are rated 60 Hz.
Maximum load on Omron timer is 5amp at 230 volt
Timer should be connected to 2-pole contactor (relay) instead of directly connected to pump.
http://waterheatertimer.org/images/contactor-drawing.gif

Does Amazon sell percentage cycle timer in your country?
A cycle timer makes one full revolution each hour, or 4-hours, or 12 hours. Then percentage is set for 8% for 1 hour cycle.
Contact Intermatic and ask if they have 50 cycle percentage cycle timer, or ordinary cycle timer in 50 Hz.

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

Merry Bright digital looks same as GE 15057 and Westek TE55WHB timers

To identify your timer see following two links:
http://compare.ebay.com/like/260679690470?
http://waterheatertimer.org/Woods-timers-and-manuals.html#6-24

Add a comment if this is not your timer.

Here is Westek TE55WHB manual.
Read manual for full information.
http://waterheatertimer.org/pdf/WESTEK-TE55WHB-manual.pdf

Here are instructions taken from manual.
To set current time:
Hold down CLK button and then push day hour and min button until current time shows.

To program:
Press PRG button until 1 and ON display.
Press day hour and min button to set program1 ON
Press PRG button until 1 and OFF display.
Press day hour and min button to set program1 OFF
Press PRG button until 2 and ON display.
Repeat steps to set more programs.
Set up to 7 programs
Programs repeat each 24 hours
When finished, press CLK button and current time displays.

To operate timer: press MODE button.
AUTO to run timer functions.
RDM and timer turns on-off at random times.
Manual to override timer functions.

Utilitec makes 2 different plug-in timers.
Utilitec 0155671 is about size of baseball and has 5 buttons and two outlets. Programming is shown on link below.
http://waterheatertimer.org/How-to-program-Utilitec-0155671.html

Utilitec 0144506 timer is small and rectangular with 5 buttons and slide switch located on top of timer. This timer can turn lights on-off once a day and has 1 outlet. 0144506 Instructions are given in steps shown below.
Also see:
http://waterheatertimer.org/How-to-program-Utilitec-0144506.html

Steps:
-Plug timer into wall for 1 hour until rechargeable battery is charged and display shows.
-If battery will not charge, then check electricity to wall outlet, if electricity is good and battery will not charge, then timer is no good.
-Lamp has to be turned on for timer to work. Check bulb if timer stops working.

-Unplug timer to set program.
-Press reset button with paper clip to remove any programming.

-Slide switch on top of timer to 'Timer'
1) Set current time
Hold down Time button
Press HOUR until current hour am-pm shows in display.
Hold down Time button
Press MIN button until current minute shows
Since this is a one-day repeat timer, no day program is available.

2) Program ON > this is when you want lamp to turn ON
Hold down ON button.
Press HOUR until ON hour with am-pm displays.
Hold down ON button.
Press MIN until ON minute displays.

2) Program OFF > this is when you want lamp to turn OFF
Hold down OFF button.
Press HOUR until OFF hour with am-pm displays.
Hold down OFF button.
Press MIN until OFF minute displays.

3) Set timer to operate
Make sure slide-switch on top of timer is set to 'Timer' to run program
Plug lamp into timer, and then plug timer into wall outlet
For manual override, move slide-switch to 'On' and light will stay ON

The timer is the "on" switch.
Things that can stop it starting.
Door switch- is the depresser pin contacting.
Broken main belt.

Faulty - motor- timer- door switch- belt switch ( if fitted) wireing.

i had prob where my sony would switch off for a few secs thenh come back on . The solution was in menu / tv settings / sleep timer . Go into that and make sure its set to off. there are opions for off , 5 min 20 min 30 min etc... mine was set to nothing just blank.

Setting the Sleep Timer The sleep timer allows your LCD TV to automatically turn OFF after a given amount of time. You can set the sleep timer using your remote control or through the onscreen display (OSD).
TO SET THE SLEEP TIMER USING THE REMOTE CONTROL
1. Press the SLEEP button on the remote control. The sleep timer appears at
the top of your screen.
2. Press the SLEEP button one or more times to select the time you want.
3. Press the EXIT button to hide the sleep timer display. Your sleep timer is now running in the background. The sleep timer will be hidden after 10 seconds.
Turning On the LCD TV.
1. Press the MAIN POWER switch in the back of the unit (see Back Connectors for location). The Status LED on the front turns orange
and your LCD TV is ready to turn on.
2. Press the POWER button on the front of your LCD TV or on your
remote control. The Status LED on the front turns green.

timer set in menu options. Mine did the very same thing until I cleared the timer