A cold basement with no hot water, radiators that won’t heat, or a furnace that won’t fire signals an immediate problem—and on a winter night, an emergency. J&G Heating & Air Conditioning dispatches NATE-certified technicians during emergency hours (Mon–Sun, 6:00 AM–10:00 PM, after-hours fee applies) to diagnose and repair boiler failures across Lancaster County. We’ve spent nearly three decades repairing hydronic heating systems, and we know exactly how to identify whether the problem is a failed pressure relief valve, a stuck flow control valve, a broken pump, or a control board malfunction—and how to restore your heat quickly.
Don’t freeze. Get expert boiler repair now. When you’re dealing with a heating emergency, the contractor matters as much as the diagnosis. Our experience, manufacturer certifications, and family-owned service all add up to one thing: a boiler repair done right the first time, backed by people who’ll be here for maintenance and future repairs when you need them.
J&G Heating & Air Conditioning provides boiler repair across Lancaster County. Emergency service is available Mon–Sun, 6:00 AM–10:00 PM (after-hours fee applies). When your heating system fails on a winter night, our emergency team dispatches a technician equipped with diagnostic tools and common replacement parts. We’ve spent nearly 30 years building expertise in the hydronic heating challenges of our region’s climate and homes.
Your thermostat is calling for heat, but the boiler doesn’t ignite or power down within seconds. Causes include a failed electronic igniter, a tripped high-limit safety switch, a stuck gas valve blocking fuel flow, or a control board failure.
Your boiler is running but radiators stay cold, or hot water never reaches your taps. This signals a failed circulator pump, a stuck zone valve blocking water flow, or low water pressure in the system.
Water pooling around the boiler signals a failing pressure relief valve, a cracked connection, or corrosion on pipe joints. A slowly leaking system loses water pressure gradually, which eventually triggers a low-water shutoff.
Boilers should operate quietly with a soft hum of the circulator pump. Loud banging signals water hammer, gurgling means air is trapped in the system’s water lines, and squealing from the pump means bearing wear.
Normal boiler pressure is 12–20 PSI. If pressure climbs above 20 PSI, water is overheating or the expansion tank is failing. If pressure drops below 10 PSI, the low-water cutoff shuts down the boiler as a safety measure.
A burning smell during startup is normal as dust burns off. But persistent burning or visible soot around the burner area signals incomplete combustion—a carbon monoxide hazard that requires immediate attention.
Every boiler repair we do follows the same proven process — designed to deliver rapid diagnosis, professional workmanship, and a system that performs from day one. Tap any step below to see exactly what happens.
You describe your boiler problem (no heat, won’t start, low pressure, leaking, strange noises). Our dispatcher logs the call and dispatches the nearest available technician with a fully equipped service vehicle. The technician arrives, observes the boiler and distribution system visually: checking for visible water leaks, inspecting gas connections, looking for discoloration or corrosion around seams, listening for unusual sounds, and feeling water temperature at radiators or pipes. This rapid triage indicates whether the problem is electrical, pressure-related, circulation-based, or combustion-related.
The technician checks the pressure gauge on your boiler. If pressure is low (below 12 PSI), the system has a leak or lost water during a previous repair. If pressure is high (above 20 PSI), the expansion tank or thermostat may be faulty. They listen to the circulator pump—it should hum steadily—and feel the pump housing. A vibrating pump or silent pump indicates pump failure. They also measure water temperature at the boiler outlet and at one or more radiators. If the boiler heats but radiators stay cold, circulation is blocked by a failed pump, a stuck zone valve, or an air lock.
If the boiler is not firing, the technician tests gas pressure at the gas valve inlet using a manometer. Low pressure signals an upstream issue—a clogged meter regulator, a kinked gas line, or utility-side problem. Normal pressure means the gas is reaching the boiler. They then test the igniter for proper spark output using an igniter tester or multimeter. A weak or absent spark explains failed ignition. They also verify the thermostat signal is reaching the boiler—using a multimeter to confirm 24V AC voltage at the control board when the thermostat calls for heat.
If the boiler is starting, the technician performs a combustion test using a flue gas analyzer inserted into the vent pipe. The readings reveal whether fuel and air are mixing correctly and whether combustion is complete. They also visually inspect the heat exchanger for visible cracks, corrosion, or separation of seams. A cracked heat exchanger is a serious problem and a carbon monoxide hazard—if found, the boiler should not operate until the heat exchanger is replaced.
If combustion is normal but the boiler still won’t heat properly, the technician tests individual safety components: the high-limit switch (prevents overheating by shutting burner off if water gets too hot), the low-water cutoff (shuts down if pressure drops dangerously low), pressure relief valve (opens if pressure climbs above safe limits), and flow control valve. A malfunctioning safety component can block normal operation. They use a multimeter to test for electrical continuity and proper operation.
Once the problem is identified, the technician performs the repair: replacing a failed igniter (30 minutes), replacing a failed pressure relief valve (45 minutes to 1 hour), replacing a failed circulator pump (1–2 hours), replacing a zone valve or expansion tank (1–2 hours), cleaning or replacing the burner assembly (1–2 hours), replacing the gas valve (1–2 hours), replacing the control board (1–2 hours), or replacing a cracked heat exchanger (4–6 hours, major repair). After repair, the system is restarted and monitored.
Before leaving, water pressure is adjusted to the correct operating point (typically 15 PSI cold), circulation is verified flowing steadily to all radiators, and the boiler is cycled through multiple on/off sequences. The technician explains what failed, why it failed, what the repair involved, and any maintenance recommendations to prevent recurrence. You receive documentation: service receipt with repair description, parts replaced, labor hours, and any warranty terms.
The pump moves heated water through your radiators. A failed pump means the boiler heats but radiators stay cold. Replacement typically takes 1–2 hours and restores circulation immediately. We carry replacement pumps for all major boiler brands.
Schedule Pump ReplacementThis safety device opens if internal pressure climbs too high, venting water to prevent system damage. A stuck or leaking relief valve causes pressure problems and water loss. Replacement takes 30–45 minutes and we have parts in stock.
Get Pressure Valve ServiceZone valves direct hot water to specific radiators or rooms. A stuck valve blocks flow to an entire zone, leaving those radiators cold. We test, clean, and replace zone valves to restore multi-zone heating. Repair typically takes 1–2 hours.
Schedule Zone Valve ServiceElectronic igniters spark the burner flame. A failed igniter means no combustion and no heat. We stock replacement igniters for all major brands and can usually complete replacement same-day within 30 minutes.
Book Igniter ServiceGas valves regulate fuel flow; faulty valves prevent ignition or cause weak flames. Thermostats signal the boiler to start and stop. We test and replace both components. Diagnosis and replacement typically take 1–2 hours.
Get Gas Valve or Thermostat ServiceThis tank absorbs water expansion as the boiler heats, preventing dangerous pressure buildup. A failed tank causes pressure spikes and relief valve leaking. Replacement takes 1–2 hours and stabilizes pressure immediately.
Schedule Expansion Tank ServiceThe heat exchanger transfers combustion heat to water. Small surface cracks can sometimes be sealed; larger cracks require replacement. This is a major repair (4–6 hours) and is performed only when justified economically.
Schedule Heat Exchanger InspectionModern boilers rely on circuit boards to manage ignition, circulation, and safety controls. A failed board stops the entire system. We carry replacement boards and test communication with your thermostat before leaving.
Get Control Board Service
We believe every homeowner in Lancaster County deserves access to reliable heating and cooling — regardless of budget. That’s why J&G Heating & Air Conditioning partners with trusted financing providers to offer flexible payment plans that fit your financial situation. Whether you’re replacing an aging boiler, upgrading to a high-efficiency air conditioning system, installing a high-efficiency heat pump, or investing in a new generator system, financing allows you to enjoy the comfort you need today while spreading payments over time.
Our team will walk you through every available option during your free estimate, helping you understand monthly payment amounts, interest rates, and approval requirements. We want the financial side of your project to feel just as comfortable as the temperature in your home.
As an authorized Wells Fargo financing partner, J&G Heating & Air Conditioning offers a range of credit options to help you manage the cost of your new heating or cooling system. With competitive rates and flexible terms, qualifying homeowners can enjoy convenient monthly payments that fit comfortably into their household budget.
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Through our partnership with PowerPay, we provide another trusted financing pathway for Lancaster County homeowners ready to upgrade their home comfort. PowerPay’s streamlined application process and flexible repayment plans make it easy to get started on your project without delay.
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GoodLeap offers flexible financing options and competitive rates, making it easy for homeowners to invest in high-efficiency heating, cooling, and generator systems. With a simple application process and a variety of repayment terms, upgrading your home comfort doesn’t have to mean a large upfront cost.
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When you join one of our maintenance programs, you’ll receive scheduled tune-ups performed by our NATE-certified technicians who know your system inside and out. We’ll clean critical components, check refrigerant levels, inspect electrical connections, test safety controls, and ensure everything is operating as it should.
Regular maintenance doesn’t just prevent breakdowns — it also helps lower your energy bills and protects your manufacturer warranty coverage. It’s one of the smartest investments you can make in your home’s comfort and your family’s safety.
When your boiler fails on a winter night, a rapid, expert repair is the difference between a warm home and a freezing emergency. J&G Heating & Air Conditioning specializes in boiler diagnosis and repair. We’ve spent nearly three decades fixing hydronic heating systems across Lancaster County. When you call us, you’re getting technicians with deep hydronic knowledge, diagnostic discipline, and the parts and tools needed to fix your system fast.
After repair, maintenance prevents future emergencies. Join our maintenance plan for annual fall tune-ups before heating season. Preventive maintenance catches developing problems early, extends your boiler’s life, and gives you confidence heading into winter. Explore our maintenance plans to protect your investment.
After repair, schedule fall maintenance to prevent future emergencies and keep your system running efficiently.
Boiler MaintenancePair your boiler’s radiant heating with efficient air conditioning for year-round comfort.
AC Repair ServicesIf you have a separate water heater, keep it maintained to prevent cold-water emergencies.
Tankless Water Heater RepairAdd UV lights or whole-home air filters to complement your boiler heating.
Indoor Air Quality SolutionsIf repair costs are significant, flexible payment plans make it affordable.
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