A modern furnace runs a strict startup sequence, and knowing where the sequence breaks is most of the diagnosis. The thermostat calls, the inducer motor spins up to prove draft through a pressure switch, the hot surface igniter glows, the gas valve opens, the burners light, the flame sensor confirms fire, and only then does the blower deliver heat to the house. In Dover, NH, the failures cluster at predictable points: a flame sensor coated in oxide that can no longer prove the flame, a hot surface igniter cracked from years of thermal cycling, a pressure switch that will not close because the inducer is weak or the condensate trap on a high-efficiency model has clogged, or a control board with a burned relay. Each one stops the sequence cold, and each one mimics the others from the hallway.
Dover HVAC repairs furnaces by testing the sequence, not guessing at it. Our experienced technicians watch the startup step by step and measure at each stage: igniter resistance, flame signal in microamps, pressure switch operation against actual inducer draft, gas valve voltage, and blower and capacitor health. Every visit includes the safety fundamentals on a fuel-burning appliance: the heat exchanger inspected, connections leak-tested, and draft confirmed, because the difference between a furnace problem and a furnace hazard is not visible from the thermostat. We measure temperature rise against the data plate before we leave so the fire and the airflow are matched the way the manufacturer intended.
We work on gas, propane, and electric models from every major brand, both conventional 80 percent units and condensing high-efficiency models with their traps, drains, and dual pressure switches. The truck stock covers the parts that actually fail: igniters, flame sensors, pressure switches, capacitors, inducer assemblies, and blower motors, so most no-heat calls end with heat the same visit. For furnace repair anywhere in Dover, call (351) 345-9323 and we will get the burners lit today.
For air conditioning breakdowns, see AC Repair in Dover.
How Much Does Furnace Repair Cost in Dover?
The typical furnace repair in Dover lands between $150 and $600. Cleaning a flame sensor is a small job; replacing a blower motor or control board is a bigger one. Dover HVAC tests the system, finds the actual fault, and quotes the repair before any work begins.
| Repair | Typical cost | What it usually means |
|---|---|---|
| Flame sensor cleaning or replacementBurners light but cut out almost immediately | $80–$250 | Furnace lights, then shuts off within seconds |
| Hot surface igniter replacementFurnace clicks and tries to start but never lights | $150–$400 | Furnace clicks and tries to start but never lights |
| Draft inducer motorStartup fan fails, furnace won't fire | $400–$1,000 | Startup fan fails, furnace won't fire |
| Blower motorNo airflow, or the blower runs nonstop | $400–$1,500 | No airflow, or the blower runs nonstop |
| Control boardErratic behavior, error codes, or no response at all | $300–$700 | Furnace won't respond to the thermostat |
| Gas valve replacementValve fails to open, so the furnace never lights | $250–$700 | Valve fails to open, so the furnace never lights |
Typical ranges for common repairs. Your exact price is quoted after diagnosis.
Factors That Change the Price
- Furnace age and type, because 90%+ efficiency models have more specialized parts
- A cracked heat exchanger, which is a safety issue and usually points to replacement
- Timing, such as a no-heat call on a cold night versus a scheduled repair
- Access to the furnace in attics, closets, or crawlspaces
When a repair gets expensive on an aging furnace, you'll see both options before deciding. No heat right now? Call (351) 345-9323.
Signs You Need Furnace Repair in Dover
Spotting the early warning signs gives you the chance to act before the situation spirals into something far more expensive. Here are the most common indicators that it's time to call a professional:
- A bang or boom when the burners ignite late
- A flame that burns soft and yellow rather than steady blue
- Rust streaks, soot, or water around the cabinet or flue
- Frequent on-off cycling that never reaches the thermostat setting
- Grinding or high-pitched squeals from the blower
- The furnace clicks and glows but the burners never light
- Repeated shutdowns just seconds after the burners light
- A fan that keeps running while the registers blow cool air
Act Before It Gets Worse
What seems like a minor issue today can take out a compressor or heat exchanger tomorrow. At the first hint of a problem, reach out to Dover HVAC at (351) 345-9323 for a fast inspection.
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Call (351) 345-9323 NowFurnace Repair FAQ
Why Hire a Professional for Furnace Repair?
The most serious furnace problem is usually hidden. A cracked or corroded heat exchanger can let combustion gases into the airstream, and nothing about it is visible from the outside of the cabinet. Delayed ignition makes things worse, because each boom at light-off puts more stress on that metal. Add high voltage, a gas valve, and a flue to the same box, and there is little room for guesswork. Diagnosis is full of traps too. A high limit that keeps tripping could be a bad switch, or it could be doing exactly its job because a filter is clogged or the blower is dying, and swapping out a working switch only hides the real fault.
At Dover HVAC, no symptom gets treated in isolation. A meter tells us the flame signal, so we never condemn a good sensor while the real culprit, a cracked igniter or a weak gas valve, stays in place. We confirm draft at both the pressure switch and the flue, measure temperature rise against the data plate to flag airflow problems early, and test the gas side with a leak detector, not a guess. When we are done, the furnace has proven itself safe and correct through a full cycle, and if it is nearing the end of its useful life, we tell you honestly.
Our Furnace Repair Process
We follow a proven process to ensure every repair and installation is completed to the highest standards. Here's what you can expect when you choose Dover HVAC:
Startup Sequence Testing
The furnace is run through its startup while we measure inducer draft, pressure switch response, igniter resistance, flame signal, and gas valve operation. The goal is to pinpoint the exact step that fails.
Combustion Safety Check
Every repair includes a safety check: heat exchanger inspection, instrument leak testing on the gas side, and flue draft verification, because a furnace that runs is not the same as a furnace that runs safely.
Targeted Repair
Igniters, flame sensors, pressure switches, capacitors, and motors ride on the truck, so most furnaces are lit and heating again before we pack up.
Full Verification
We run complete cycles, measure temperature rise against the data plate, confirm clean ignition without booming, and verify every limit and safety control before we leave.
Want a Professional Opinion?
Call Dover HVAC to discuss your furnace repair needs with an experienced technician.
Get Help: (351) 345-9323How to Prevent Furnace Repair Problems
A few simple habits now, like regular filter changes and seasonal tune-ups, can add years to your system's life. Start with these practical measures our team relies on:
- Store laundry supplies, especially chlorine products, well away from the furnace closet
- Give the furnace room to breathe, since a crowded utility space starves the burners of air
- Replace the filter every month while the furnace is working hard, since it costs less than any other part
- On high-efficiency models, keep the condensate trap and drain line clear and draining
- Notice how the furnace sounds at startup, because a quiet light-off is healthy and a boom is not
- Schedule service each fall to catch worn igniters and dirty sensors before cold weather arrives
- Test your CO detectors monthly and make sure each floor has one
DIY vs. Professional Furnace Repair
A homeowner can swap a filter with ease, but diagnosing capacitors, refrigerant charge, control boards, and error codes calls for the equipment and know-how only a pro brings. Here's a comparison:
| Factor | DIY Attempt | Professional Service |
|---|---|---|
| Heat Exchanger | Damage hidden inside the cabinet | Inspected on every repair visit |
| Ignition Faults | New igniter installed on a hunch | Each ignition component tested |
| Gas Connections | Connections judged by smell | Every fitting checked with a detector |
| High-Limit Trips | Safety switch bypassed or swapped | Filter, blower, and ducts checked for the cause |
| Airflow Match | Fan speed never checked | Temperature rise set to the data plate |
| Final Check | One good start and done | Full cycles proven clean and safe |
Get Furnace Repair Help Today
The sooner you call, the sooner your comfort is back. Reach Dover HVAC for fast service.
Call (351) 345-9323 TodayWhere We Provide Furnace Repair
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