If there is electrical noise (arcing) somewhere in your house or in the street supply (pole fuse perhaps) that might make a cheap clock run fast. Fixing a clock that runs too fast can be as easy as turning a screw. WHAT'S THE FIX FOR A STOVE DIGITAL CLOCK THAT RUNS FAST - Answered by a verified Appliance Technician We use cookies to give you the best possible experience on our website. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. Re: Digital bedside clocks gaining time rapidly! The most common wall clocks either run on a battery or are key-wound. All run fast, several seconds/day.
A clock that runs quickly still works fine; it just needs a simple adjustment. Clocks with an interior or exterior pendulum have adjustment screws either on the pendulum or through a hole in the top of the clock.

I use only typical home appliances and most of them were used in my previous homes (in other cities) where the older digital clocks that are now running fast kept almost perfect time. Winding wall clocks have gears and cogs that turn together in conjunction with each other to keep proper time. Some clocks regulate their time from the 50 Hz supply, but most use their own oscillator. I have no problems with brownouts, flickering lights, etc. It may take up to two weeks to properly set a clock that runs fast.
Battery-powered clocks, which feature quartz technology, use electrical pulses to keep proper time.