A furnace that won’t heat can have several causes. Explore the symptoms below, learn what a diagnosis should cover, and prepare for your repair visit.
Help for a furnace that won’t heat.
Repair support for gas & electric.
Know what happens next.
COMMON FURNACE REPAIRS
REPAIR PROBLEM 01
When the thermostat calls for heat but the house stays cold, the fault may involve ignition, power, controls, or the safety circuit.
Start by checking the thermostat mode and set temperature. A technician can then trace the furnace’s startup sequence and identify where the call for heat stops.
Discuss this furnace problemREPAIR PROBLEM 02
A failed igniter, dirty flame sensor, or interrupted ignition sequence can leave a gas furnace unable to establish a steady flame.
A proper diagnosis checks ignition components and verifies flame sensing. Repeated resets can hide a fault; stop resetting a furnace that repeatedly locks out.
Discuss this furnace problemREPAIR PROBLEM 03
Weak airflow, a fan that won’t run, or a blower that keeps running may point to a motor, capacitor, control, or airflow restriction.
Inspect the filter and keep supply and return grilles unobstructed. Internal blower and electrical checks should be performed by a qualified professional.
Discuss this furnace problemREPAIR PROBLEM 04
A furnace that starts and stops frequently needs a check of airflow, thermostat operation, temperature limits, and control signals.
Frequent cycling can have more than one cause. Note how long the furnace runs and whether it stops before the room reaches the thermostat setting.
Discuss this furnace problemREPAIR PROBLEM 05
Unresponsive controls and inaccurate temperatures can interrupt heating even when the furnace itself still has working components.
Check the thermostat display, batteries if fitted, and selected schedule. A technician can test low-voltage control signals and wiring before recommending parts.
Discuss this furnace problemREPAIR PROBLEM 06
New rattling, scraping, or squealing can indicate a loose component or worn moving part. Describe when the sound begins.
Avoid operating a furnace that makes a new scraping sound or repeated loud bangs. Describe the sound and its timing during the heating cycle when requesting a diagnosis.
Discuss this furnace problemYOUR QUESTIONS, ANSWERED
Know what to check, what to ask, and what comes next.
Possible causes include an ignition fault, a flame-sensing problem, an airflow restriction, or a thermostat/control issue. The exact cause needs diagnosis; the same symptom can come from different components.
Check that the thermostat is set to heat and above the room temperature. Look for a blocked or very dirty filter, check that vents are open, and note any displayed error code. Do not open gas fittings or bypass safety switches.
Many faults in either type can be repaired, depending on the failed component, system condition, and availability of the correct parts. A service professional should assess the specific furnace.
The fault, replacement parts, diagnostic charge, labor, access, and appointment timing can affect the price. Ask for the diagnostic fee first and an itemized repair estimate before authorizing work.
Your city and ZIP code, furnace make and model if accessible, whether it is gas or electric, the symptoms, and any fault code are useful. Mention recent changes or previous repairs.
No. Appointment availability and job suitability must be confirmed with the participating provider. A location page is not a booking confirmation.
FIND YOUR LOCATION
Explore furnace repair by state, then find your city. Local service and appointment availability are confirmed when you contact a provider.
AL · 592 cities
AZ · 461 cities
AR · 620 cities
CA · 1,591 cities
CO · 477 cities
CT · 184 cities
DE · 79 cities
DC · 1 city
FL · 943 cities
GA · 669 cities
ID · 236 cities
IL · 1,454 cities
IN · 970 cities
IA · 1,024 cities
KS · 738 cities
KY · 552 cities
LA · 489 cities
ME · 66 cities
MD · 532 cities
MA · 125 cities
MI · 740 cities
MN · 904 cities
MS · 426 cities
MO · 1,081 cities
MT · 495 cities
NE · 593 cities
NV · 132 cities
NH · 41 cities
NJ · 654 cities
NM · 515 cities
NY · 968 cities
NC · 771 cities
ND · 401 cities
OH · 1,247 cities
OK · 838 cities
OR · 424 cities
PA · 1,861 cities
RI · 31 cities
SC · 472 cities
SD · 481 cities
TN · 500 cities
TX · 1,832 cities
UT · 332 cities
VT · 107 cities
VA · 679 cities
WA · 633 cities
WV · 439 cities
WI · 792 cities
WY · 204 cities
Start with the symptoms. Get clarity on your next step toward a warmer home.
Call (844) 985-4255