Boiler Troubleshooting & No-Heat Diagnostics in Chicago
If your boiler isn't heating, is leaking, making noise, or showing pressure problems — we can help. We troubleshoot steam boilers, hot water boilers, combi-boilers, and high-efficiency systems.
Fast response. Licensed & insured. Same-day service available.
Boiler Diagnostic Pricing
Upfront pricing — know the cost before we start.
$95.36
Includes full boiler inspection, pressure check, pump evaluation, electrical testing, and repair options.
Top Boiler Problems & What They Mean
Common symptoms, likely causes, and what to do next.
Possible causes:
- Faulty circulator pump
- Air in system
- Zone valve failure
- Low pressure
- Ignition failure
Possible causes:
- Pressure relief valve failure
- Expansion tank failure
- Corroded fittings
- Over-pressurization
Possible causes:
- Leaking system
- Faulty expansion tank
- Air in system
- Sediment buildup
Possible causes:
- Faulty pressure relief valve
- Expansion tank failure
- Blocked piping
Possible causes:
- Air in system
- Poor circulation
- Sediment buildup
- Steam boiler water level issues
Possible causes:
- Dirty flame sensor
- Faulty ignitor
- Bad gas valve
- Blocked venting
Quick Troubleshooting Checklist for Homeowners
A few things you can safely check before calling — and clear signs to stop and call us.
- Thermostat set to "Heat"
- Thermostat batteries
- Boiler power switch
- Boiler water pressure (12–20 PSI normal for hot water systems)
- Radiators (listen for air or cold spots)
- Leaking water
- Smell of gas
- Burning smell
- Pressure over 25 PSI
- No ignition
- Loud banging
- Boiler shutting off repeatedly
Common Boiler Repairs We Perform
Boiler Troubleshooting Checklist (Technician)
When Troubleshooting Leads to Replacement
If repair isn't cost-effective, we provide upfront replacement options on the spot.
What to Expect from a Boiler Diagnostic
Boiler troubleshooting requires proper pressure testing, pump evaluation, ignition diagnostics, and safety checks. We service all boiler types and provide clear repair options with upfront pricing. If a repair isn't safe or cost-effective, we offer replacement options immediately.
What Chicago Says
Boiler Service Reviews — D's Air & Heating
"D's Air & Heating diagnosed our boiler problem in under an hour. Clear explanation, fair price, and fixed right the first time."
Verified Customer
Uptown, Chicago
"Our boiler was making a strange noise and losing pressure. D's Air & Heating found the issue immediately and had it running perfectly."
Verified Customer
Lakeview, Chicago
"Darryl walked us through every step of the diagnosis. D's Air & Heating is the most transparent HVAC company we've ever worked with."
Verified Customer
Lincoln Square, Chicago
Boiler Not Working? We Can Help.
Same-day and emergency appointments available across Chicago. Upfront pricing — no surprises.