For homes
We repair steam and hot water boilers in houses, two-flats, and greystones. You get a diagnosis, a quoted repair, and a tested system before we leave.
- Cold radiators upstairs
- Banging steam pipes
- Boiler losing pressure
Boiler repair Chicago IL that gets your heat back fast
When your boiler quits in October, you need boiler repair Chicago IL that actually shows up. We work on steam and hot water systems in greystones, two-flats, and high-rises from Lakeview to Logan Square. Our techs carry the parts to fix pressure loss, water hammer, and no-heat calls quickly.
Pressure checkBurner testLeak trace- We test before we leaveFull heating cycle, every time
- We show the failed partYou see what we replaced
- We log the readingsPressure and combustion numbers
- We protect the floorDrop cloths in the work area
What our boiler repair service includes
Every boiler repair visit starts with a full diagnostic and ends with a tested system. Here is what is covered in a standard repair, and what we quote separately if the job grows.
Full system diagnosis
We check water level, pressure, burner operation, flue draft, and all safety controls. You get a plain-language explanation of what failed and why. Diagnosis takes 30 to 45 minutes and is included when you approve the repair.
Failed part replacement
Thermocouples, flame sensors, hot surface igniters, gas valves, zone valves, and circulator pumps are common replacements. We use parts that meet ICC Mechanical Code Compliance and test the system through a full heating cycle before we leave.
Pressure and leak repair
If your boiler is losing pressure, we trace the leak at radiator valves, air vents, or the expansion tank. We repair or replace the failed component and refill the system to the correct cold-fill pressure for your setup.
Combustion and safety check
We test gas pressure with a manometer and check combustion with a flue gas analyzer. The relief valve, low-water cutoff, and spill switch all get tested. If anything fails a safety check, we tell you before we leave.
Written service log
You get a record of what failed, what we replaced, and the pressure readings we took.
Homes and businesses.
The approach is the same for a home and a business. What changes is the access, the schedule and who needs the paperwork.
For buildings
We work on boilers serving multi-unit buildings and small commercial spaces. Property managers get a written log and a clear repair-or-replace recommendation.
- Zone valve failures
- Circulator pump replacement
- Pressure control issues
Boiler repair Chicago IL: what the job actually involves
A plain-language look at what Boiler Repair involves and when it is needed.
See how it worksBoiler repair Chicago IL is the diagnostic and mechanical work that restores heat and hot water to a steam or hydronic system. We start by checking the obvious: water level in the sight glass, pressure on the gauge, and whether the burner fires at all. From there we test the thermocouple, flame sensor, gas valve, circulator pump, and zone valves with a digital multimeter and manometer. If the system is losing pressure, we trace the leak at radiator valves, air vents, or the expansion tank before we touch the burner.
Chicago winters hit hard, and most of the housing stock here runs on older steam or hot water systems. A boiler that ran fine in September can fail on the first 20-degree night. We see steam boiler not heating repair Chicago Illinois calls every week from October through March, plus boiler pressure loss repair Chicago in buildings with original 1920s piping. If you need a Chicago boiler company that knows these systems, we keep common parts on the truck so most repairs finish in one visit.
A boiler that fires is not the same as a boiler that heats evenly.
- What it is
- Diagnostic and mechanical work that restores heat to steam or hydronic boiler systems.
- When you need it
- No heat, low pressure, water hammer, or a burner that will not fire.
- What to expect
- A 30 to 45 minute diagnosis, a quoted repair, and a full-cycle test.
How our boiler repair process works
From the first call to the final pressure test, here is what you can expect when you book boiler repair service Chicago with us.
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Phone triage
We ask what you are seeing: no heat, low pressure, banging pipes, or water on the floor. That tells us whether to send a tech with a circulator pump or a combustion analyzer first. You get a two-hour arrival window, not a four-hour maybe.
- Phone triage
- Symptoms
- Arrival window
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On-site diagnosis
The tech walks the system: sight glass, pressure gauge, burner, flue, and zone valves. We use a digital multimeter on the controls and a manometer on gas pressure. Diagnosis usually takes 30 to 45 minutes, and we tell you the finding before any repair starts.
- On-site diagnosis
- Controls test
- Pressure check
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Upfront repair quote
You get the price for the fix before we open a toolbox. If there are two paths, like repairing a zone valve versus replacing it, we quote both. No surprise line items, no hourly meter running while we think.
- Upfront quote
- Two options
- Your approval
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Repair and test
We replace the failed part, then run the boiler through a full cycle. That means watching it fire, reach pressure, and shut down on the aquastat or pressuretrol. We check for gas leaks at every joint and confirm the flue is drafting correctly.
- Repair and test
- Part replaced
- Full cycle
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Walkthrough and log
Before we leave, we show you what failed, what we replaced, and what to watch for. You get a written service log with the parts used and the pressure readings. If a follow-up visit is needed, it is already scheduled.
- Walkthrough
- Service log
- Next steps
Tools and methods we use on boiler jobs
Move across a circle, or focus it and press Enter, for an illustrative thermal view of the photograph.
Flue gas analyzer
Measures combustion efficiency and carbon monoxide on every burner repair. If the flue is not drafting correctly, we find it before it becomes a safety issue.
Digital multimeter
Tests thermocouples, flame sensors, gas valves, and circulator pumps for continuity and voltage. This is how we confirm a failed part instead of replacing it on a hunch.
Manometer
Checks gas pressure at the valve and verifies draft in the flue. Correct gas pressure is the difference between a clean burn and a sooting boiler.
Thermal imaging camera
Finds cold spots in hydronic lines and hot spots at failing joints. It helps us trace a leak or a blocked zone without opening walls.
Combustion analyzer
Confirms the air-to-fuel ratio after any burner or gas valve work. We do not leave a boiler until the numbers are in range.
Thermal views are illustrative, generated from the photographs.
Methods
Vacuum pump and manifold gauge set
Used on the cooling side of dual-fuel systems and on refrigerant circuits tied to boiler controls. Standard equipment on every truck.
Anemometer
Measures airflow at registers and flue outlets. Useful when a boiler shares a mechanical room with other equipment.
Combustion analysis after every burner repair
We test flue gas with a combustion analyzer before we call a burner repair done. That confirms the air-to-fuel ratio is correct and the boiler is not producing excess carbon monoxide. It is a five-minute step that catches problems a visual inspection misses.
Hydronic balancing
On hot water systems, we balance zones so every radiator gets its share of flow. That means adjusting valves and checking circulator performance.
Steam pressure tuning
We set the pressuretrol to the correct cut-in and cut-out for your building, then verify the low-water cutoff works. This reduces water hammer and extends the life of the piping.
ACCA Manual J Load Calculation
When a repair turns into a replacement conversation, we size the new boiler with ACCA Manual J Load Calculation. That accounts for your building's insulation, windows, and square footage. An oversized boiler short cycles and wastes gas.
When Chicago homeowners call us
No-heat night call
Your steam boiler quits on the first 20-degree night in October and the house is dropping fast.
We triage the call, send a tech with a thermocouple, flame sensor, and circulator pump on the truck, and diagnose on arrival. Most no-heat calls get repaired quickly, and we test the system through a full cycle before leaving.
Outcome: Heat is back quickly, usually within two to four hours of your call. You get a written log of what failed and what we replaced.
Cold radiator
You own a greystone in Wicker Park with original 1920s steam piping and one radiator never heats.
We inspect the radiator valve, air vent, and supply line, then check the pressuretrol setting. Cold radiators on old steam systems are usually an air vent or balance issue, not a boiler failure. We fix the vent and balance the system.
Outcome: Every radiator heats evenly, and the boiler stops short cycling. Your gas bill often drops because the system is no longer running flat out.
Pressure loss
Your boiler is losing pressure every week and you keep adding water to the system.
We trace the leak at radiator valves, air vents, and the expansion tank. Constant fresh water is the fastest way to kill a boiler from the inside. We repair the failed component and refill to the correct cold-fill pressure.
Outcome: The system holds pressure for the season, and you stop topping it off. If the leak is in buried piping, we tell you what that repair involves before you commit.
Inspection flag
You are selling a two-flat and the inspection flagged the boiler's flue and gas valve.
We inspect the flue for proper draft and the gas valve for correct operation. If either fails ICC Mechanical Code Compliance, we repair or replace it and document the work. We can coordinate with your attorney or inspector.
Outcome: The boiler passes re-inspection, and you have a written service log to hand the buyer. That keeps the closing on schedule.
Old boiler decision
We diagnose the actual failure and quote both repair and replacement. If the heat exchanger is cracked, repair is not an option. If the failure is a circulator pump or gas valve, we give you the repair price and let you decide.
Outcome: You make the call with real numbers in front of you, not a sales pitch. If replacement makes sense, we size it with ACCA Manual J Load Calculation.
How boiler repair runs in Chicago
Chicago's housing stock is the biggest factor in how we approach boiler repair. Greystones, courtyard buildings, and two-flats often run original steam systems with piping that has been in the walls for a century. Those systems need low pressure and clean air vents, not high-pressure fixes.
Our winters swing from 40 degrees in November to single digits in January, and a boiler that short cycles in mild weather will fail when it gets cold. We also work in high-rises and newer construction where hydronic systems run at higher pressure with zone valves and circulator pumps. If you need hot water boiler repair Chicago, Illinois, we match the approach to the building.
Cook County inspectors want to see code-correct gas and flue work, so we document every safety check. For a boiler repair near me Chicago IL call in Lakeview or Portage Park, we are usually in the neighborhood already.
- Lakeview: Dense two-flats and greystones with original steam systems. Water hammer and cold radiators are the most common calls we get here.
- Logan Square: Many renovated two-flats with a mix of old steam piping and newer hydronic zones. Balancing those systems takes a different approach than a straight repair.
- Gold Coast: High-rises and older mansions with hydronic systems running at higher pressure. Zone valve failures and circulator pump issues are frequent.
- Portage Park: Bungalows and two-flats with boilers that often date to the 1980s. We see a lot of thermocouple and gas valve failures in this housing stock.
- Rogers Park: Large courtyard buildings with steam systems serving many units. A single failed air vent can leave a whole stack of radiators cold.
- Single-digit January cold snaps: Boilers run nonstop and small problems become failures. A circulator pump on its last legs will quit during a cold snap. We stock pumps on every truck for that reason.
We walk the system and ask what you have noticed. We set drop cloths and get tools in place. We test the repair and explain what we found.
From problem to finished result.
Cold radiators in a Logan Square two-flat
Before: The upstairs unit had cold radiators while the downstairs cooked. The boiler ran constantly and the gas bill was climbing. A previous company suggested replacing the boiler entirely.
After: We found a failed circulator pump and air trapped in the upstairs zone. We replaced the pump, purged the lines, and balanced the zones. Both units heated evenly, and the boiler stopped running nonstop.
Bleed the upstairs radiators each October and check the circulator for unusual noise. An annual tune-up catches a failing pump before it quits in January.
Water hammer in a Wicker Park greystone
Before: The banging in the steam pipes was loud enough to wake tenants at 5 a.m. Two air vents had failed and the pressuretrol was set too high. The building owner was worried about pipe damage inside the walls.
After: We replaced both air vents and reset the pressuretrol to the correct cut-in and cut-out. The banging stopped quickly. Pressure held steady through the season, and no pipes needed replacement.
Have the air vents checked every fall.
Pressure loss in a Gold Coast high-rise
Before: The boiler was losing pressure every week and the building engineer was adding water constantly. Two zones ran cold. The constant fresh water was corroding the system from the inside.
After: We traced the leak to a failed zone valve and a bad expansion tank. We replaced both, refilled to the correct cold-fill pressure, and verified the system held for 48 hours. All zones heated evenly.
Check the expansion tank and zone valves each fall. If you are adding water more than once a season, call us before the leak damages the boiler.
Boiler problems we fix in Chicago
Most boiler calls fall into a handful of categories. Here are the ones we see most often in Chicago buildings, and what happens if you let them go.
- Cold radiatorsBoiler fires but radiators stay coldYou pay for gas that heats water nobody feels. In a two-flat, that means one unit freezes while the other cooks. The cause is usually air trapped in hydronic lines or a failed circulator pump. We purge the air, test the circulator with a digital multimeter, and replace the pump if it has failed. Then we balance the zones so every radiator heats evenly. Most jobs finish in two to three hours.
- Water hammerLoud banging or water hammer in steam pipesWater hammer is not just noise. It stresses pipe joints and can crack a fitting inside a wall. We check the pressuretrol setting, clear the low spots, and replace failed air vents. Steam needs to move freely. Once the system is balanced, the banging stops and the radiators heat quietly.
- Pressure lossBoiler keeps losing pressureLow pressure means no heat upstairs and a boiler that short cycles. If the cause is a hidden leak, you are also adding fresh water constantly, which corrodes the system from the inside. We trace the leak at radiator valves, air vents, and the expansion tank. We repair the failed part, refill to the correct cold-fill pressure, and check that the system holds. If the leak is in buried piping, we tell you what that involves.
- Burner will not firePilot lights but burner will not fireA dirty flame sensor or failed thermocouple stops the burner from firing even when the pilot is lit. You get no heat and a boiler that runs its inducer motor without ever igniting. We test the flame sensor and thermocouple with a digital multimeter, clean or replace the failed part, and confirm the burner fires through a full cycle. This is one of the fastest repairs we do, usually under two hours.
Why homeowners call us for boiler work
Heat restored with the right part, tested before we leave.
prompt heat restored
Most no-heat calls get diagnosed and repaired in one visit. We stock thermocouples, flame sensors, and circulator pumps on every truck, so a failed part does not turn into a two-day wait. If we need a specialty part for a Weil-McLain or Burnham, we tell you the timeline before we leave.
Steam and hydronic experience
Steam systems are not the same as forced air. Water hammer, air trapped in hydronic lines, and low-water cutoff trips need a tech who understands pressuretrol settings and Hartford loops. We work on both, and we explain what failed in plain language instead of guessing.
Code-correct repairs
That matters when a flue pipe, gas valve, or relief valve is involved. We do not patch a safety device to get you through the week; we fix it right so the inspection passes.
Honest repair-or-replace call
If your boiler is 25 years old and the heat exchanger is cracked, we tell you. You get the cost to repair a boiler in Chicago IL and a replacement quote side by side, then you decide.
What you receive
Clear records you can keep and share.
Service log
Parts used and pressure readings
Photo report
Images of the failed part
Repair quote
Price before work starts
Test record
Combustion and cycle results
Steam and hydronic systems are not the same
Knowing which system you have changes what we check first and how we set it up.
Steam systems
Use low pressure and air vents to move heat
- Low pressuretrol settings
- Air vents at each radiator
- Water hammer is common
Hydronic systems
Use a circulator pump to move hot water
- Zone valves control flow
- Air must be purged
- Pressure stays steady
Dual-fuel setups
Pair a boiler with a heat pump or AC
- Two systems, one control
- Seasonal switchover
- Shared mechanical room
What we work with
- Thermocouples
- Flame sensors
- Circulator pumps
- Zone valves
- Gas valves
- Air vents
- Expansion tanks
- Pressuretrols
Service ZIP codes.
A list like this tells people straight away whether you cover their street. Not listed? Call and ask: it only takes a minute.
- 60018
- 60649
- 60641
- 60640
- 60643
- 60642
- 60645
- 60644
- 60647
- 60646
- 60616
- 60617
Towns we serve.
Based in Chicago and covering the places around it. Pick one for local details.
- Lincoln Park
- Lakeview
- Wrigleyville
- Lincoln Square
- Ravenswood
- North Center
- Roscoe Village
- Logan Square
- Bucktown
- Wicker Park
- Ukrainian Village
- Uptown
Boiler repair questions Chicago homeowners ask
A thermocouple or flame sensor replacement sits at the low end. A circulator pump, zone valve, or gas valve replacement sits higher. Diagnosis is included in the repair price when you approve the work. If you only want the diagnosis, we quote that separately before we start.
The three most common causes are a failed thermocouple, a dirty flame sensor, or low water pressure in the system. If the pilot lights but the burner never fires, start with the flame sensor. If the boiler fires but radiators stay cold, you likely have air trapped in hydronic lines or a failed circulator pump. We test all three in the first 30 minutes.
We do. Our techs work on steam and hot water systems across Cook County, including Weil-McLain and Burnham boilers in greystones and two-flats. We handle water hammer, pressuretrol issues, and low-water cutoff trips. If your steam boiler not heating repair Chicago Illinois call comes in before noon, we can usually be there quickly.
A well-maintained steam or hot water boiler lasts 15 to 25 years in Chicago. Hard water and short cycling shorten that. We also check the heat exchanger for cracks, because that is the one failure you cannot patch.
Other heating and cooling services we handle
Other services from the same team.
- Radiator Heat RepairSteam radiator water hammer, cold radiators, leaking valves and uneven heat floor to floor. We balance the system, replace failed vents and valves, and fix the banging that keeps you up at night. Common in greystones and vintage two-flats on the North Side.
- Heat Pump RepairHeat pumps that blow cold in heating mode, freeze up or fail to defrost. We test the reversing valve, defrost board and refrigerant charge, and repair or replace what's failed. We service Carrier, Trane, Lennox, Rheem, Goodman, Bryant and American Standard systems.
- Emergency HVAC ServiceNo heat at 2 a.m., no cooling during a 95-degree weekend, or water pooling around the furnace. Call (312) 638-0812 and we'll tell you what to check while a tech heads your way.
Need boiler repair Chicago IL today?
Call (312) 638-0812 and we will triage your no-heat call right now. We give you a two-hour arrival window, upfront pricing, and a tech who knows steam and hot water systems. If it is after hours, we tell you straight whether we can make it tonight.
Get in touch with us
Call (312) 638-0812 or email info@hvacchicagopro.com and tell us what your system is doing. If you leave a message after hours, we'll call you back with a plan.
- Phone
(312) 638-0812 - Email
info@hvacchicagopro.com - Address
Chicago, Illinois