Almost every large repair bill we write started life as a small, easily ignored symptom. The pattern is consistent enough that it’s worth writing down.
Below are the signals we most often wish someone had called about sooner, grouped by system. Three of them are urgent. The rest are “book it this month.”
Plumbing
Drains slowing across more than one fixture. A single slow sink is a local clog. Two or more fixtures slowing at the same time usually means the problem is further down the line — the branch drain or the main sewer. A camera inspection settles it in minutes and is far cheaper than the emergency you get by waiting.
Water stains, warm spots on a slab floor, or a bill that climbed for no reason. These are the classic hidden-leak signs. On a slab foundation the water often surfaces a long way from where it’s actually leaking, which is why guessing at the location is a bad idea.
Gurgling drains or a persistent sewer odour. Gurgling means air is being pulled through the trap because something downstream is restricted. The smell means a trap has dried out or a vent is blocked. Neither fixes itself.
Heating and cooling
A furnace or heat pump that short-cycles. Turning on and off every few minutes usually points to airflow restriction, a failing sensor, or a system badly oversized for the house. All three cost you efficiency and shorten the equipment’s life.
Rooms that never match the thermostat. Usually duct leakage or poor balancing rather than an undersized unit. Worth diagnosing before anyone sells you a bigger system you don’t need.
Rising energy bills with unchanged habits. The slow version of a fault. If the bill is climbing year over year in the same house with the same routine, something is degrading.
Electrical
Breakers that trip repeatedly on the same circuit. A breaker doing its job once is fine. A breaker doing it weekly is telling you the circuit is overloaded or something on it is faulty. Replacing the breaker with a larger one is not the fix — it removes the protection without removing the cause.
Warm outlets or switch plates, scorch marks, or a burning smell. Stop. This is one of the three urgent ones. Kill the circuit at the panel if you can do it safely and get an electrician out.
Lights that dim when large appliances start. Common on older 100A panels carrying modern loads. Not immediately dangerous, but it’s the signal that the service is at its limit — worth knowing before you add an EV charger or a heat pump to it.
The three that mean stop
To be explicit, because the list above blurs together:
- A gas smell — leave, then call 911 and PG&E at 1-800-743-5000.
- Burning smells, warm outlets, or scorching — kill the circuit, call an electrician.
- Water you cannot stop — find the main shutoff and close it. If you don’t know where yours is, go and find it now, before you need it in the dark.
Everything else on this list is a booking, not an emergency. But they’re all cheaper this month than next year.