Highwood HVAC: Reset Your Heating System Quickly

Estimated Read Time: 10 minutes

Your heater stopped working right when Chicago’s North Shore temps dropped. Before you panic, try this safe guide on how to reset your heating system. We will walk you through quick checks for furnaces, boilers, and heat pumps, then help you decide when to call American Vintage Home for fast, professional help. Bonus: keep an eye out for a free installation estimate if you end up needing an upgrade.

Start Here: Safety First

Heat is essential, but safety comes first. If you smell gas, hear hissing, or suspect a carbon monoxide issue, evacuate and call your utility and emergency services. Install a working carbon monoxide detector on every level.

Run these universal checks before any reset:

1. Thermostat:
2. • Set to Heat and Auto, not Fan Only.
   • Raise setpoint 5 degrees above room temperature.
   • Replace batteries if you see a low-battery icon or dim screen.
2. Power:
3. • Confirm the furnace or boiler switch is On. It often looks like a light switch near the unit.
   • Check the breaker panel for a tripped breaker. Fully turn it Off, then On.
   • Look for a GFCI outlet trip near the equipment and press Reset if tripped.
3. Filter and airflow:
4. • A clogged filter can lock out a furnace. Replace if dirty.
   • Open at least 80% of supply registers to avoid overheating and short cycling.
4. Fuel supply:
5. • For gas heat, ensure the gas valve handle is parallel to the pipe.
   • For radiators, make sure valves are open and not painted shut.

If you pass these checks and the system still will not heat, try a system-specific reset below.

How To Reset a Gas Furnace Safely

Many furnaces protect themselves by locking out after failed starts. Reset the right way to avoid damage.

Step-by-step:

1. Power cycle correctly:
2. • Turn the furnace power switch Off.
   • At the thermostat, set the system to Off.
   • Wait 60 seconds. Turn the furnace switch back On. Then set the thermostat to Heat and raise the setpoint.
2. Check the furnace door switch:
3. • If the blower panel is not seated, the unit will not run. Reseat and ensure it clicks.
3. Inspect the condensate safety switch:
4. • High-efficiency furnaces produce condensate. A full drain line can trigger a float switch. If you see standing water, call for service to clear the trap and line.
4. Flame sensor and ignition clues:
5. • If you hear clicking and a brief flame that goes out, the flame sensor may be dirty. Do not sand it unless you are trained. Call a pro to clean and test safely.
5. Red reset button myth:
6. • Gas furnaces do not use a push-to-reset button like oil burners. Use the power cycle method only.

If the furnace still locks out after one restart, stop and call a professional. Repeated restarts can flood the heat exchanger with unburned gas.

How To Reset a Hot Water or Steam Boiler

Boilers heat radiators or baseboards and often have safeties that shut down after faults.

Do this first:

1. Confirm water pressure:
2. • On a typical hydronic system, the cold pressure reads around 12–15 psi. If it is near zero, do not reset. Call for service.
2. Thermostat and power:
3. • Make sure the thermostat calls for heat.
   • Verify the service switch is On and the breaker is not tripped.
3. Pilot and ignition:
4. • Most modern boilers have electronic ignition. If your older unit uses a standing pilot and it is out, follow the manufacturer lighting instructions on the unit or call for service. If you smell gas, do not attempt to relight.
4. Reset with care:
5. • Some boilers have a burner control with a reset button. Press once only. If the burner does not fire and lockout returns, stop. Repeated resets can be unsafe.
5. Air in system:
6. • Radiators cold at the top may be air bound. Bleeding requires care. If unsure, call a pro to avoid water spills and burns.

Pro tip for North Shore homes: steam systems in Evanston and Wilmette often need radiator vent maintenance and proper main vent sizing. If you hear hammering or see uneven heat, reset will not fix venting issues. Schedule a tune-up.

How To Reset a Heat Pump or Ductless Mini Split

Chicago winters push heat pumps hard. Incorrect settings or a recent power outage can confuse the defrost cycle.

Follow these steps:

1. Mode check:
2. • Set mode to Heat, not Auto, to prevent cooling during shoulder seasons.
2. Hard reset:
3. • Turn the system Off at the thermostat or handheld remote.
   • Cut power at the indoor disconnect or breaker for 3 minutes. Restore power and set to Heat.
3. Outdoor unit status:
4. • If the outdoor fan and coil are encased in ice, do not chip it. Give it a full defrost cycle. If icing persists, call for service to test sensors and refrigerant charge.
4. Airflow matters:
5. • Clean washable mini split filters monthly during heavy use.

If the heat pump trips the breaker again after restart, stop and call. That points to a shorted component or seized compressor.

Thermostat Resets: Wi‑Fi and Programmable Models

Many no-heat calls trace back to thermostat settings.

• Program override: press Hold or Temporary Hold to force a fixed setpoint.
• Battery swap: replace AA or AAA batteries yearly. Low voltage can misread room temperature.
• Factory reset: if schedules are scrambled after a power outage, use the Reset option in the menu. Rejoin your home Wi‑Fi after the reset.
• Smart home checks: confirm your thermostat is in the correct Home or Heat mode. Disable Eco mode if the home feels cold.

If you have a two-stage furnace or a heat pump with auxiliary heat, incorrect thermostat wiring can stop the second stage or backup heat. Professional commissioning prevents this.

Common Reasons a Reset Does Not Work

When a reset fails, there is usually an underlying fault that needs diagnostics.

Likely causes:

1. Safety lockouts:
2. • Limit switch trips from clogged filters or closed vents.
   • Pressure switch faults from blocked intake or exhaust piping.
2. Ignition failures:
3. • Weak hot surface igniter or dirty flame sensor.
   • Gas valve or control board failure.
3. Condensate failures:
4. • Frozen or clogged condensate drain on high-efficiency furnaces.
4. Boiler issues:
5. • Failed circulator pump, stuck zone valve, or low water cut-off trip.
5. Heat pump issues:
6. • Failed defrost sensor, low refrigerant, or fan motor failure.

These problems need tools, meters, and training to solve. The right fix protects your home and warranty.

When To Stop Troubleshooting and Call a Pro

Call American Vintage Home if you notice any of the following:

• You smell gas or receive a carbon monoxide alarm.
• The system locks out again after one safe reset.
• Breakers keep tripping or wires look burned.
• The boiler pressure is low or you see leaks.
• The outdoor heat pump is a block of ice.

Why call us:

• We are the Older Home Experts for Chicago’s North Shore. We solve heating problems without harming your home’s original character.
• Our team services furnaces, steam and hot water boilers, radiant floors, heat pumps, and high-velocity SpacePak and Unico systems.
• We provide 24/7 emergency heating repairs and use advanced diagnostics for faster, safer fixes.
• We install high-efficiency equipment from Carrier, Bryant, York, and Weil‑McLain, with many models over 90% efficient.

Hard facts you can trust:

• BBB A+ rating since 2009 and an EPA Lead‑Safe Certified Firm under TSCA Section 402.
• Nation’s largest SpacePak installer with annual national awards since 2011.

Prevent the Next No‑Heat Event: Maintenance That Works

A proper tune-up prevents lockouts and keeps warranties valid. Our Heating Maintenance Plan includes critical safety and performance checks, such as:

• Clean and adjust gas burners.
• Inspect for proper operation of igniter or pilot light.
• Inspect the heat exchanger for cracks and leaks.
• Check flue pipe.
• Check and record CO/CO2 levels in exhaust to ensure proper combustion.
• Check all safety and operational controls.
• Inspect flame operation for safety and performance.
• Lubricate all moving parts.
• Examine air filter and replace if you have one on hand.
• Check bearings of blower or pump.
• Check expansion tanks.

Every plan starts with a 50-point inspection across heating, cooling, and plumbing. We send scheduling reminders, waive the standard $79 diagnostic in our immediate service area for covered equipment after the initial visit, and provide priority emergency service.

Plan options that fit older homes and busy lives:

• Heating only: $12 per month.
• Pick 2: Heating, Cooling, or Plumbing for $20 per month. Save $48 per year.
• Pick 3: Heating, Cooling, and Plumbing for $30 per month. Save $72 per year.

Member discounts help you save more:

• 10% off HVAC maintenance and repairs on individual heating or cooling plans.
• 15% off HVAC maintenance and repairs on combined heating and cooling plans.
• 7% off new installations and contracted work.

Special Notes for Older Homes in Chicago’s North Shore

Vintage bungalows in Skokie, brick two‑flats in Rogers Park, and Evanston Victorians often have:

• Limited ductwork or none at all.
• Steam or hot water radiators with unique venting needs.
• Plaster walls and trim that deserve protection.

We specialize in solutions that preserve original details:

• High‑velocity SpacePak or Unico systems for homes without conventional ducts.
• Boiler and radiator upgrades that improve comfort and efficiency.
• Ductless mini splits for targeted rooms or additions.

If your older home heater stops working, a simple reset might restore heat. If not, our retrofit expertise prevents invasive work and keeps your home’s character intact.

Quick Reference: Reset Checklists by System

Use these brief lists when you need a fast answer.

1. Gas furnace checklist:
2. • Thermostat set to Heat and batteries fresh.
   • Power switch On and breaker reset.
   • Filter clean and vents open.
   • Power cycle Off for 60 seconds, then On.
   • Stop after one failed restart and call.
2. Boiler checklist:
3. • Thermostat calling for heat.
   • Service switch On and breaker reset.
   • Pressure around 12–15 psi when cold.
   • One reset on burner control. Do not repeat.
   • Stop if pilot will not light or if you smell gas.
3. Heat pump checklist:
4. • Mode set to Heat, not Auto.
   • Breaker Off for 3 minutes, then On.
   • Clear snow and debris from outdoor unit.
   • Do not chip ice. Call if icing persists.

Why Your Heater Fails After Power Outages

After outages or brownouts, control boards can enter fault mode.

• Surges can trip breakers or damage transformers.
• Thermostats can lose schedules and time settings.
• Smart thermostats may default to energy saver modes that cut heat.

A controlled power cycle often restores operation. If lockouts remain, diagnostic testing of voltage, safeties, and sensors is needed.

When Resetting Turns Into Replacing

If your system is old, oversized, or failing core parts, replacement can cut bills and stress.

Consider an upgrade if you notice:

• Frequent lockouts or repeated repair visits.
• Rooms out of balance, drafts, or dry air despite constant running.
• A cracked heat exchanger warning.
• Boiler leaks, corrosion, or failed pumps.

Our team sizes and installs high‑efficiency furnaces and boilers, plus modern heat pumps that can pair with existing systems. We handle SpacePak and Unico retrofits that protect your home’s original features. Financing and free estimates make planning easier.

The Bottom Line on Resets

A safe reset is a good first step when the heater stops. If heat does not return after one attempt, or if there are safety signs, schedule service. Our 24/7 team restores heat fast and protects your home and warranty.

Special Offers for North Shore Homeowners

• Free, no‑obligation estimates on heating system and heat pump installations. Call (847) 440-5642 or request service at americanvintagehome.com to claim your free estimate.
• No Lemon Guarantee on furnace replacements: if your heat exchanger fails in the first 10 years, we install a new furnace at no charge for the original owner. Call for details.
• Maintenance Plan savings: up to 15% off HVAC maintenance and repairs for combined heating and cooling plans, plus 7% off new installations.

Special Offer: Schedule today and mention this article to receive your free estimate on heating or heat pump installation. Call (847) 440-5642.

What Homeowners Are Saying

"AVH did a wonderful job replacing our furnace. Professional, respectful, efficient. All the things you want in these kinds of services..."
–Robert K., Furnace Replacement

"Very timely! Was able to arrive and resolve the issue with our furnace within hours of the initial call!"
–Matthew R., Furnace Repair

"He listened to our concerns. Was professional did a thorough job flushing the air out of our radiant heating system. Everything is heating much more evenly... Would definitely recommend this company to other people"
–L. M., Radiant Heating Service

"I recently had them come out and do a full upgrade to the HVAC system... the attention to detail displayed was outstanding... I have full confidence that no corners were cut."
–Max B., Full HVAC Upgrade

Frequently Asked Questions

How long should I cut power when resetting my furnace?

Wait at least 60 seconds with the furnace switch Off before restoring power. This clears most control board faults without risking damage.

Is it safe to press the reset button on my boiler more than once?

No. Press it once only. If lockout returns, stop and call a professional. Multiple resets can be unsafe and may damage the burner.

Why does my heat pump blow cool air during winter?

It may be in defrost mode or set to Auto. Set mode to Heat and allow a full defrost cycle. If icing persists, schedule service.

Can a dirty filter really stop a furnace from heating?

Yes. A clogged filter can trip the limit switch and cause repeated lockouts. Replace standard filters every 1 to 3 months.

Do maintenance plans really help with older homes?

Yes. Regular tune-ups catch safety issues early, improve comfort, and help keep manufacturer warranties valid, which matters for vintage homes.

Conclusion

If your heater stopped working, a careful reset can bring back heat fast. Use the steps above for furnaces, boilers, and heat pumps, then call American Vintage Home if the system locks out again or shows safety warnings. We serve Chicago’s North Shore with 24/7 support and older home expertise.

Call, Schedule, or Chat Now

Get your heat back today. Call (847) 440-5642, visit americanvintagehome.com, or schedule online. Ask for your free installation estimate and mention our Maintenance Plan savings when you book.

Call (847) 440-5642 or schedule at americanvintagehome.com. Mention this article for a free estimate on heating or heat pump installation and ask about our No Lemon Guarantee.

About American Vintage Home

American Vintage Home Heating, Cooling & Plumbing is Chicago’s Older Home Expert. We install and service furnaces, boilers, radiant heat, heat pumps, and high‑velocity SpacePak and Unico systems. BBB A+ since 2009. NATE‑certified, EPA Lead‑Safe Certified Firm, and the nation’s largest SpacePak installer with awards every year since 2011. We offer free estimates, no‑surprise pricing, 24/7 emergency service, and a 100% satisfaction guarantee.