24/7 Furnace Repair in Woodstock, IL and Chicagoland — Same-Day Service
No heat? GSHA Services repairs every furnace brand, 24 hours a day, 7 days a week, with same-day service across McHenry, Lake, Kane, Cook and DuPage counties and southern Wisconsin. Our technicians arrive in GPS-dispatched trucks stocked with the ignitors, flame sensors, pressure switches, inducer motors, capacitors and control boards that cause most winter breakdowns, so the majority of repairs are finished in one visit. You get a written, upfront price before any work starts — and if a repair does not make sense, we will say so.
Furnace problems we fix every day
These are the calls we get most from Woodstock, Crystal Lake, McHenry, Lake Bluff, Libertyville and the surrounding towns every winter — and what usually causes them:
| What you notice | Likely cause | What to check before you call |
|---|---|---|
| Furnace will not turn on at all | Tripped breaker, blown fuse or door switch, thermostat, failed control board | Thermostat set to Heat and above room temp; furnace switch on; breaker; furnace door fully closed |
| Blower runs but air is cold | Failed hot-surface ignitor, dirty flame sensor, gas valve, open limit switch | Filter clean? Gas supply on? Count the LED flash code on the board and tell us |
| Clicks or lights, then shuts off (short cycling) | Dirty flame sensor, pressure switch or blocked condensate drain, overheating from a clogged filter | Replace the filter; make sure PVC intake/exhaust pipes outside are clear of snow, ice and leaves |
| Loud humming, squealing or grinding | Blower motor, capacitor, inducer motor bearings | Turn the furnace off at the switch to avoid further damage and call |
| Water around the furnace | Clogged condensate trap or drain line, failed condensate pump, humidifier leak | Unplug the condensate pump if it is overflowing; we clear and test the drain |
| Rooms uneven, furnace runs constantly | Undersized or aging furnace, duct leaks, failed blower speed tap, stuck damper | Note which rooms are cold; we measure airflow and temperature rise |
| CO detector alarms, soot, or a strong smell | Cracked heat exchanger, blocked flue, back-drafting | Leave the house, call 911 / Nicor at 888-642-6748, then call us. We never restart a furnace that fails a CO test |
How much does furnace repair cost?
Every repair starts with a diagnostic visit. The technician tests the furnace, finds the fault and gives you a written, flat price for the repair — you approve it before any work begins, and the diagnostic covers the whole visit, not per-problem. Typical GSHA repair prices in the Chicago suburbs, parts and labor included:
| Repair | Typical installed price | Notes |
|---|---|---|
| Flame sensor cleaning / replacement | $120 – $280 | The #1 cause of “lights then shuts off” |
| Hot-surface ignitor | $180 – $400 | Common on furnaces 7+ years old |
| Capacitor | $150 – $350 | Blower hums but will not start |
| Pressure switch or draft inducer motor | $220 – $950 | Inducer motors are the higher end |
| Condensate drain / pump service | $150 – $450 | High-efficiency furnaces |
| Gas valve | $450 – $1,000 | Includes leak test and combustion set-up |
| Blower motor (ECM / variable-speed) | $600 – $1,600 | Often covered by a 10-year parts warranty |
| Control board | $450 – $1,200 | Communicating boards are the higher end |
| Heat exchanger | $1,500 – $3,500 | Usually a warranty part-only job or a reason to replace the furnace — get our free second opinion |
Ranges reflect typical GSHA jobs; your exact price is quoted in writing on site. If your furnace is under a manufacturer parts warranty (most Carrier and Lennox furnaces carry 10 years when registered), you pay labor only. Repairs after hours may carry an emergency rate — we tell you before we dispatch.
Repair or replace?
Our rule of thumb: if the furnace is over 15 years old and the repair costs more than a third of a new furnace — or it is the second big repair in two winters — replacement usually wins, especially with 2026 Nicor, Carrier and Lennox rebates. We will show you both numbers. See furnace installation prices or our guide to repairing vs. replacing a furnace in Chicagoland.
Why call GSHA for furnace repair?
- Open 24/7 — a real person answers; emergency no-heat calls are dispatched first.
- Factory-authorized Carrier Factory Authorized Dealer and Lennox Premier Dealer — we handle warranty parts for those brands and repair every other brand too.
- Upfront pricing — flat-rate repair prices approved by you before we start; no hourly surprises.
- Stocked trucks and GPS dispatch — the nearest technician with the right parts, so most repairs are done in one visit.
- Safety first — every visit includes a carbon-monoxide check and a heat-exchanger inspection with a camera when warranted.
- Local and accountable — family-owned, BBB Accredited since 2015, offices in Woodstock and Lake Bluff, technicians background-checked and NATE-certified.
Furnace repair by brand
We repair all brands. These pages cover common faults, error codes and warranty details for the furnaces we see most:
Carrier furnace repair
Lennox furnace repair
Goodman furnace repair
Amana furnace repair
Trane furnace repair
Carrier furnace error codes & troubleshooting
Avoid the next breakdown
Most winter no-heat calls trace back to a dirty flame sensor, a clogged filter or a blocked condensate drain — all caught by an annual tune-up. A furnace tune-up before the first cold snap, or a GSHA PROTECT membership with priority service and repair discounts, is the cheapest furnace repair you will ever buy.
Frequently asked questions
Do you offer emergency furnace repair at night and on weekends?
How much is a furnace repair service call?
My furnace turns on and then shuts off after a few seconds. What is wrong?
What furnace brands do you repair?
Is my furnace repair covered by warranty?
Should I repair or replace a 15-year-old furnace?
Another company says my heat exchanger is cracked. Do I have to replace the furnace?
Do you service furnaces in Wisconsin?
Last updated September 16, 2026 by the GSHA Services team. Repair price ranges are typical for GSHA jobs; your exact price is quoted in writing on site before work begins.