If your heater is not working and there are no safety warning signs, start with the thermostat settings, an accessible air filter, and blocked vents. Note whether the system stays off, runs without warming the house, or repeatedly shuts down. Those observations help you decide what to do next and describe the problem when you call.
You do not need to complete a checklist before asking for help. If you are unsure, uncomfortable, or the house is getting too cold, contact a professional. This guide covers central home heating in Houston, not water heaters, vehicle heaters, or portable-heater repair.
Stop troubleshooting if you notice these warning signs
Gas smell or a suspected leak
Leave immediately on foot. Do not operate switches, use a phone, start a vehicle, or do anything that could create a spark near the suspected leak. From a safe location, call 911 and your gas utility. CenterPoint Energy’s Houston gas-leak guidance lists 713-659-2111 for its Greater Houston customers. Do not try to find or repair the leak.
Carbon monoxide alarm
Get everyone outside to fresh air immediately and call 911. Do not look for the source or reenter until emergency responders say it is safe. Follow CPSC’s carbon monoxide alarm guidance. Carbon monoxide has no smell; the absence of an odor does not rule it out.
Smoke sparking or an electrical burning smell
Stop troubleshooting. If there is smoke or fire, leave and call 911. Do not touch damaged equipment or electrical components. A heater that repeatedly trips a breaker or shuts itself down also needs professional attention; do not keep resetting it.
Heater not working First identify the symptom
What you can observe is more useful than guessing which part failed. Start with the pattern that best matches your system.
| What you notice | What to check or record | When to seek help |
|---|---|---|
| Nothing starts | Thermostat mode, setpoint, display messages, and any known outage. | The system still does not respond after basic settings checks. |
| Air moves but the home stays cold | Fan setting, room temperature trend, and accessible airflow obstructions. | The home does not recover toward the set temperature. |
| Starts then repeatedly stops | How often it happens and any visible thermostat message. | Repeated shutdowns need diagnosis; do not keep restarting. |
| Only some rooms stay cold | Which rooms are affected and whether furniture blocks vents. | The difference persists after accessible obstructions are cleared. |
These patterns can have more than one cause. A thermostat message, unusual sound, or short operating cycle does not establish a failed component by itself.
Safe checks before calling for heating repair
Confirm the thermostat is requesting heat
Check that the thermostat is in Heat mode and that the desired temperature is above the current room temperature. Review any schedule, Away, or Eco setting that could change the setpoint. Trane’s furnace troubleshooting guidance identifies heating mode and setpoint as basic checks.
If the display is blank or shows a low-battery warning, replace batteries only if your thermostat has a user-accessible battery compartment and the owner’s instructions permit it. Do not remove wiring or assume every thermostat uses batteries.
Check the fan setting too. On many systems, Fan On can move air between heating cycles. Air coming from the vents does not necessarily mean the system is producing heat. Follow the thermostat instructions for the appropriate setting.
Check an accessible filter and clear blocked vents
If your filter is in a safely accessible homeowner-service location, inspect it according to your equipment instructions. If it needs replacement, use the specified size and type and follow the instructions for shutting the equipment off first. Do not open equipment compartments or climb into an unsafe space to reach it.
Move furniture or other accessible obstructions away from supply registers and return grilles. Restricted airflow can contribute to heating problems, but a dirty filter is not proof of the cause. Replacing it does not resolve every no-heat condition.
Record power information without opening equipment
Note a known power outage, a blank thermostat, or a clearly visible tripped breaker if you can observe it safely. Share that information when you call. Do not remove electrical covers, touch wiring, or cycle breakers to force the heater to restart.
If equipment appears switched off, do not assume it was accidental. It may have been shut down for service or a safety concern. Ask before turning it back on.
Stop when the checks do not restore normal operation
If the system remains off, the house stays cold, or shutdowns continue, leave further testing to a technician. Do not bypass safety controls, relight burners, clean internal sensors, or repeatedly reset the equipment.
Still without heat? Arrange heating repair in Houston so AirTeam can evaluate the cause and explain the next steps.
Why your heating system type matters
Gas furnace
A gas furnace produces heat through combustion and uses electrical controls and a blower to distribute warm air. Ignition, combustion, venting, and gas-related problems require professional evaluation. For the basics, read how a furnace works.
Heat pump
A heat pump moves heat and can deliver air that feels less hot than furnace air. The useful question is whether the home is reaching the set temperature. Defrost and auxiliary-heat operation can affect what you observe, but persistent loss of heating, heavy icing, or repeated shutdowns needs evaluation. Do not assume every change in airflow temperature is normal.
Central electric heating
Central electric heating uses electrical heating components and controls. A blower can move air even when heat is not being delivered as expected. Testing heating elements, relays, wiring, and related components belongs to a qualified professional.
When to call for heating repair in Houston
Request service when basic checks do not restore heat, the system repeatedly shuts down, or it cannot bring the home toward the set temperature. Report persistent unusual sounds, weak airflow, and any breaker trips. These observations help guide diagnosis; they do not tell you which part needs replacement.
How long you can wait also depends on indoor conditions and the people in the home. Falling temperatures may make a loss of heat more urgent for children, older adults, or people with health concerns. You do not need to wait until morning simply because there is no alarm.
For an after-hours breakdown, see AirTeam’s after-hours heating emergency guidance. For urgent HVAC help, call 713-956-8326, the emergency number listed on AirTeam’s contact page. Weekend website forms are reviewed on Monday, so call for urgent help. Gas leaks, CO alarms, smoke, and fire require emergency action first.
What to tell AirTeam when your heater stops working
If your heater stopped working, a few clear observations can help AirTeam understand the request. You do not need to identify the failed part.
- What happens when the thermostat requests heat: nothing, airflow without warmth, or repeated starts and stops.
- The thermostat setting, current room temperature, and any visible message or code.
- When the problem began and whether it affects the whole home or certain rooms.
- Recent maintenance, repairs, outages, or changes to the thermostat.
- Checks you already completed and the equipment type, if known without opening panels.
How professional diagnosis finds the cause
A technician uses your observations to choose relevant tests for the equipment and symptom. Depending on the system, evaluation may involve controls, electrical operation, airflow, furnace operation, or heat-pump performance. An initial observation may require further testing before the cause is confirmed.
Ask what was found, what evidence supports the recommendation, and whether additional testing or repair is needed. Understand the proposed work and cost before authorizing it. A no-heat symptom alone is not a reason to replace the system.
Prepare before the next heating season
Follow your equipment’s filter and maintenance instructions and respond to changes in operation. Before the next cold front, ask about pre-season heating maintenance appropriate to your system. Maintenance can help identify concerns, but it cannot guarantee that a future breakdown will not occur.
Contact AirTeam to discuss your heating problem or call 713-936-5346 for a routine service request. Describe what the system is doing so we can discuss the right appointment.
Heater not working FAQs
Why is my heater not working when the thermostat is on
A powered thermostat does not establish that the rest of the system is operating. Check heating mode and setpoint, then note whether the system starts. If it does not respond, professional testing can determine the cause.
What should I check if my heater stopped working suddenly
Check for safety warning signs first. If none are present, review thermostat settings, an accessible filter, and blocked vents. Note any known outage or thermostat message. Stop if the problem persists or the system repeatedly shuts down.
Why is air coming from the vents but the house staying cold
The fan may be running between heating cycles, or the system may not be delivering adequate heat. Equipment type and operating conditions matter. If the indoor temperature does not recover toward the setpoint, arrange diagnosis.
Can a dirty filter contribute to a heating problem
Yes, restricted airflow can contribute to poor performance or shutdowns. Check only a safely accessible filter and follow equipment instructions. A filter change does not prove or resolve every cause of a heating failure.
What should I do if the heater keeps shutting off
Do not repeatedly reset it or bypass a safety control. Record what happens and request professional diagnosis. Follow the immediate safety guidance above if there is a gas smell, CO alarm, smoke, or sparking.
