Why your washer won't fill in summer
Here's the short version: your washer stopped filling, and it happens to be summer. The season is a clue, not a coincidence.
In July and August, cities flush hydrants and everyone's running sprinklers. That stirs up sediment and drops water pressure across the neighborhood. Both problems land right at your washer's water supply.
The good news is this is usually one of the cheapest appliance fixes there is. Most of the time it's a clogged screen or a valve that isn't all the way open.
Before you spend a dime, you'll want to rule out the free fixes. in most cases summer fill problems never make it past the hose connections.
What's actually causing it
The single most common cause is a clogged inlet screen. These are tiny mesh filters right where the fill hoses screw into the machine. They exist to catch debris, and in summer they catch a lot of it.
Techs have pulled screens packed so tight with rust and grit they looked like little coffee filters. Water can't get through, so the machine sits there and never fills.
Right behind that on the list: a supply valve that got bumped half-closed, or was never opened fully after a move. It's embarrassing how often that's the whole problem (don't feel bad, it happens to everyone).
Low water pressure is the sneaky one. Your washer needs a certain push to start filling, and summer demand can drop it below that line in the late afternoon.
Further down the list are the actual part failures: a bad water inlet valve or a faulty level sensor. These are real, but they're not seasonal, so they're less likely to be your summer culprit.