Have defective timer and don't want to replace. how do I bypass the timer?

Defective timer seem far more likely.

I think this is how it should operate:
When the day skipper pin is pushed down on skipper-wheel....
... the day skipper pin pushes a lever away from trippers... so the trippers will not engage the lever ... and the day of watering is skipped.

Turn power OFF.
Take off plastic cover over the wiring terminals.
See if that is how it works, and look to see if something is missing.
Here is close up based on Intermatic image of 14-day skipper wheel, and you can see (what I assume) is the skipper pin pushing a lever.
http://waterheatertimer.org/images/Sprinkler-day-skipper.jpg

Attach close-up photo of your timer.
If you have digital camera, set to macro or tulip icon for close ups... otherwise phone cameras don't give clear view unless lighting is good.

Assuming the timer is defective... I am not certain of Intermatic's warranty policy... except they have 1 year full warranty, and could send just the timer mechanism so you do not have to replace the box... steps: take photo of wiring, disconnect wires, snap or screw new timer into existing box, reconnect wires, and then send defect back to Intermatic.com.

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

Just turn the defrost tmer clockwise to cause defrost or run conditions. If you bypass the defrost timer you will have problems like shorting of wiring or loss of the timed defrost. Why not replace the defrost timer if you know it is defective? What is the model number of your refrigerator? Thanks Sea Breeze

Unknown if this is new installation, or old installation that stopped working.
Clean waterway inside timer with white vinegar?
Change batteries?
Reset and reprogram timer
Most timers have 1 year limited warranty against defects in workmanship.
Expected lifespan for battery-operated water timer can be 6 months to 5 years.
There are no replacement parts.
Complicated digital timers can stop working for variety of reasons.
Buy another timer.
Copy following link to download manuals for several brands water timer.
http://waterheatertimer.org/Woods-timers-and-manuals.html#sprinkler

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

Always a good idea to check outlet with cheap circuit analyzer.
And move timer to different outlet to see if difficulties are outlet-specific.
Try timer at neighbor's house.
Having 3 defects in a row is unusual.

There are no repairs for defective timers.

Timer clock motors stop working for many reasons, bad manufacturing of plastic gears and power surge and dirt and reversed polarity among the causes.
Using household plug-in timer is typical solution since clock modules are not sold separately.

Following link gives tips for having low-voltage power pack last longer, in case you decide to buy Intermatic-Malibu from Home Depot:
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

I don't have a repair for defective timer.
Question posted under Woods 59377; Utilitec 155671, Westek TE06 7-day digital timer.

Open following link for written instructions
http://waterheatertimer.org/How-to-program-Utilitec-0155671.html

This is an incandescent timer, and is not rated for TV, CFL, motors etc.
If instructions are confusing, add a comment about specific part of instructions.

If timer has problems, then test outlet with circuit analyzer
If timer is defective, then buy another identical timer at Lowes or Target, and return defective timer in new package.
If you have different timer, then add a comment and describe the timer for possible help.

To permanently bypass the timer, you have to move wiring.
I don't have specific wiring diagram or programming manual for mtda8 timer, but am familiar with wiring din-rail mounted digital timers.

1) Wiring is typical across all din-rail timers, with variations of same theme depending on number of channels and purpose.
2) Open following illustration of wiring:
http://waterheatertimer.org/images/DIN-series-wiring-300.jpg
Same-similar illustration shows on side of timer.

3) Notice the mtda8 has 5 screw terminals.
4) Two screws are for incoming power. These terminals are usually labeled 1 and 2. These wires power the timer.

5) Three more screws are for the timing relay. These screws are usually labeled 3 4 and 5.
Typically the #4 center screw is common, and carries power. And when timer is ON, power is live between #4 and #3 terminal. When timer is OFF, power is live between #4 and #5 terminal.

6) Move #3 wire to #4 or #5 screw and then the timer function is bypassed.

The wire connections to the timer may have not been made correctly when it was replaced bypassing the OFF contact in the control circuit.  There should be a wiring diagram inside the front or back panel that you can check.

Check the cold control thermostat for continuity.(off/on switch)
When he bypasses the wires at the board ,he also bypasses the thermostat control.