Massachusetts no-heat guidance

What to Do When Your Heat Stops During a Massachusetts Freeze

A no-heat call becomes more urgent during prolonged freezing weather because indoor temperature can become unsafe and plumbing can freeze. Prioritize people and property safety first, then document the HVAC failure for rapid diagnosis.

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Leave and call emergency services for fire, smoke, sparking, a carbon-monoxide alarm, suspected gas leak, or a medical emergency. Do not stay in the building trying to troubleshoot an immediate safety hazard.

Safe first checks

Confirm the thermostat is in Heat mode and set above room temperature.
Check whether normal HVAC service switches were accidentally turned off.
Check a standard breaker once; if it trips again, leave it off.
For an accessible forced-air system, inspect the user-serviceable filter.
Record error codes, burner/boiler lockout messages, unusual odors and noises.
Determine whether all zones are cold or only one area has failed.

Protect occupants and plumbing

If indoor temperature is becoming unsafe, move vulnerable occupants to a safely heated location. During an extended outage, plumbing in exterior walls, crawlspaces and other cold areas can freeze before the entire home feels extremely cold.

Do not use an oven, charcoal grill, outdoor heater or other unvented combustion equipment to heat the home. Follow manufacturer instructions for any approved portable heater and keep it clear of combustibles.

What not to keep resetting

Do not repeatedly reset an oil burner, repeatedly reset a tripping electrical breaker, bypass a boiler/furnace safety, or force a heat pump to run when smoke/sparking/unsafe electrical conditions are present. Repeated resets can erase useful fault history or create additional risk.

Where to go next by system

Furnace repair · Boiler repair · Heat pump repair · Emergency HVAC guidance.

For heat-pump-specific winter behavior, use the Massachusetts Heat Pump Winter Guide.

When to request local help

If safe checks do not restore heat, request professional diagnosis and provide the system type, fuel, thermostat reading, error codes, when the failure began and whether plumbing or vulnerable occupants are at risk. Request Massachusetts HVAC help.

Massachusetts no-heat emergency planning

When Heat Stops During a Freeze, Protect People and Plumbing First

A heating failure becomes more urgent as outdoor temperature falls, especially in homes with infants, older adults, medical needs, vulnerable plumbing or sprinkler systems. Safe troubleshooting should be brief and should never delay emergency action when there is a fuel leak, carbon-monoxide alarm, smoke, electrical burning odor or other immediate hazard.

Leave and contact emergency services/utilities when appropriate for a carbon-monoxide alarm, suspected gas leak, fire/smoke or another immediate life-safety hazard. Do not remain inside trying to troubleshoot combustion equipment.

Furnace / boiler

Confirm thermostat mode/setpoint, check an accessible service switch/breaker once, and note any error display. Do not repeatedly reset a burner that will not stay running.

Heat pump

Check thermostat mode, filter/airflow, breaker status and whether the outdoor unit is blocked by snow or persistent heavy ice. Record auxiliary-heat or fault messages.

Protect pipes

Keep interior doors open where safe, allow warm air to reach plumbing areas and follow local/plumber guidance if indoor temperatures continue falling.

Information to Have Ready for an HVAC Professional

Town and outdoor temperature/conditions.
Heating-system type and fuel.
Thermostat reading and setpoint.
Error codes, lights, unusual noises or odors.
Whether hot water is also affected.
Whether the system stopped suddenly or had worsening symptoms first.
Any vulnerable occupants, frozen-pipe risk or areas already below normal temperature.

Avoid unsafe temporary heating. Never use an oven, grill or outdoor combustion appliance to heat the home. Portable electric heaters should be used only according to manufacturer safety instructions and without overloading extension cords or circuits.

After Heat Is Restored, Find the Root Cause

A one-time reset does not necessarily mean the problem is solved. Recurring lockouts, pressure loss, icing, burner faults, breaker trips or weak airflow deserve diagnosis before the next cold event.

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