No Heat

A complete outage in this weather gets moved ahead of routine work, so call and say when the heat quit and how cold the house is now.

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When this becomes an emergency

The setpoint is well above the room and nothing at the equipment stirs.
A breaker labeled for the furnace or boiler has tripped again after being reset.
The temperature inside has fallen steadily since the wind picked up.
The equipment attempts to start, then goes silent and stays that way.

What a pro does

Power comes first, always. A tech confirms the breaker, the disconnect switch, the service switch mounted near the equipment, and the door interlock, because a panel that isn't fully seated keeps the whole unit dark and it fools plenty of people. Fuel is next, then the thermostat circuit, then the ignition sequence step by step. Most outages end at a safety device that shut things down deliberately, and the real job's finding out what it was protecting against. On sealed-combustion units, that is often a blocked sidewall vent after a night of blowing snow. On older equipment it is more likely a limit switch reacting to poor airflow, or a control that has finally aged out. Replacing parts before the sequence has been walked is guesswork, and cold weather is an expensive time to guess.

Frequently asked questions

The furnace has no power at all. Where should I look before calling?

The breaker, the wall switch that looks like a light switch near the unit, and the blower door being latched fully shut. Any of the three will leave the equipment completely dead.

Is it safe to reset the breaker?

Once is reasonable. If it trips right back, something is drawing current it should not, and repeated resets can damage the board or the motor that is causing it.

Why would the system quit only when it is very cold out?

Deep cold exposes marginal parts. Longer run times heat components further, drafts change, and vent terminations ice over, so a fault that hid all fall shows up on the coldest night.

Should I run the fan in the meantime?

Setting the fan to run continuously will even out temperatures between rooms and slow down cold pockets forming on outside walls, though it cannot add any heat on its own.

No Heat?

Get connected with a local pro now.

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Keep going

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disclaimer: Green Bay Heating is a free service to assist homeowners in connecting with local service providers. All contractors/providers are independent and Green Bay Heating does not warrant or guarantee any work performed. It is the responsibility of the homeowner to verify that the hired contractor furnishes the necessary license and insurance required for the work being performed. All persons depicted in a photo or video are actors or models and not contractors listed on Green Bay Heating.

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