Top Generator Problems in Heavy Snow and How to Prevent Them

Generator problems in heavy snow are not random. After enough winters in the Sierra, the same handful of failures show up again and again — and nearly all of them are preventable with work done before the first storm.

Here are the ones we get called for most across Truckee, Donner Lake, Tahoe City and the Grass Valley–Nevada City corridor, and what to do about each.

Snow blocking generator air intakes and exhaust

A standby generator needs to breathe. Drifting snow can pack against an enclosure in a single storm and block the intake louvers or the exhaust outlet.

When that happens the unit either overheats and shuts down, or worse, exhaust gases have nowhere safe to go. This is the one snow problem with a safety dimension, not just a reliability one.

Prevention: clear a working perimeter around the enclosure before winter, and check it after big storms. If your generator sits where snow slides off a roof onto it, that placement needs to be addressed — we can advise on relocation or a snow shield.

Dead generator batteries in deep cold

Cold weather reduces battery capacity at the same time the engine gets harder to turn over. A battery that seemed healthy in autumn can fail on the first genuinely cold night.

This is the single most common reason a standby generator fails to start when it is finally needed.

Prevention: replace the battery on a schedule rather than waiting for failure, and have it load-tested during your annual service. A battery is a small line item compared to a house without heat.

Fuel supply problems

Propane systems have their own cold-weather behavior. Vaporization slows in extreme cold, and an undersized tank or regulator can struggle to deliver the volume a generator demands under full load. Buried lines and connections are also harder to inspect once everything is under snow.

Prevention: have your fuel supply checked as part of pre-winter service, and keep tanks well filled going into storm season. A delivery truck may not reach you for days after a major storm.

Rodent damage inside the generator enclosure

A warm, sheltered generator enclosure is attractive to mice and squirrels through autumn. They nest, and they chew wiring and insulation. We find this every spring, and the owner rarely had any idea.

Prevention: inspect the enclosure in autumn and again in spring. Look for nesting material and droppings, and get any chewed wiring replaced properly rather than taped.

Generator problems in heavy snow start with the AUTO switch

This one is entirely human, and it is more common than you would expect. Someone services or inspects the unit, switches it to OFF or MANUAL, and never switches it back. The generator then sits through the entire winter unable to start automatically.

Prevention: after any work on the unit — ours or anyone’s — confirm it is back in AUTO. It takes five seconds and it is worth doing every time you walk past.

Snow-season problems specific to second homes

Many properties around Truckee and North Lake Tahoe sit empty for weeks at a stretch. Nobody hears the weekly exercise cycle, nobody notices the AUTO switch, nobody clears the drift against the intake.

That is precisely when an automatic system earns its cost — a house that loses heat in January loses pipes too, and that repair dwarfs any generator service bill. If your property sits unoccupied, an annual service plus a mid-winter check by someone local is a reasonable insurance policy.

What to do if your generator fails during a storm

Check three things before calling: is it switched to AUTO, is there fuel, and is the enclosure clear of snow. Those three account for a large share of the calls we take.

If it cranks but will not run, starts and then drops out under load, or throws an error code, that is a diagnosis for us. Our generator repair service covers every major brand across the region, including Generac units, Kohler equipment, Cummins, Briggs & Stratton and more.

Book the pre-storm inspection now

Every problem on this list is cheaper to prevent in September than to fix in January.

Call Empire Energy at 530-575-5462 or request a pre-storm inspection and go into winter knowing your generator will start.