New River, AZ Heating System Reset — HVAC Tips

Estimated Read Time: 11 minutes

Heater suddenly silent? Before you shiver through the night, this guide shows you how to reset your heating system safely and get warm again. You will learn how to reset your heating system step by step, what to check first, and when to call a pro. Phoenix homeowners will also see local tips, rebates, and a simple checklist to prevent the next breakdown.

Safety First: When Not to Reset

Your comfort matters, but safety comes first. Do not attempt a reset if you notice any of the following:

• A gas smell or rotten egg odor. Leave the home and call your gas utility or 911.
• Scorch marks on equipment, melted wiring, or smoke.
• Repeated breaker trips the moment power is restored.
• Standing water around equipment or the condensate pump overflowing.

If none of these apply, you can proceed.

Quick Wins Before You Dive Deeper

Start with the easy mistakes that cause 30 to 40 percent of no-heat calls:

1. Thermostat mode and setpoint

   • Confirm Heat mode. On heat pumps, choose Heat, not Emergency Heat, unless directed by a pro.
   • Set the temperature at least 3 degrees above the room reading.

2. Thermostat schedule and holds

   • Disable vacation or eco modes. Clear any schedule that drops temps overnight.

3. Fan setting

   • Use Auto, not On. Fan On can blow room-temperature air that feels like no heat.

4. Air filter

   • Replace a dirty filter. In Phoenix dust, this can be monthly in winter.

5. Vents and returns

   • Open supply registers fully and keep returns unblocked by furniture.

If your heater still will not start, move to a proper reset.

How to Power Cycle and Reset a Furnace or Heat Pump

Power cycling clears simple lockouts after a fault. Follow these steps in order:

1. Turn off the thermostat

   • Set it to Off. Wait 30 seconds.

2. Check the breaker

   • Find the HVAC or furnace breaker and switch it fully Off, then back On. If it trips immediately, stop and call a professional.

3. Shut off furnace power switch

   • Most furnaces have a light-switch style disconnect on or near the unit. Turn it Off. Wait 60 seconds.

4. For gas furnaces only: verify the gas shutoff valve

   • The handle should be parallel to the pipe for On. Perpendicular means Off. Do not force it.

5. Restore power

   • Turn the furnace switch On, then the breaker On, then turn the thermostat back to Heat.

6. Give it time

   • Many systems have a safety delay. Wait 3 to 5 minutes to see if the inducer fan and burners start, or if a heat pump outdoor unit engages.

If heat returns, great. If not, continue with the checks below.

Resetting a Smart Thermostat Correctly

Smart thermostats are amazing until a setting blocks heat. Try this:

• Confirm Wi-Fi outages are not forcing Eco or Away.
• Run the System Test or Equipment Test menu to command heat for 5 minutes.
• If you recently changed batteries or wiring, reseat the faceplate firmly.
• Perform a soft reset from the settings menu. Avoid factory reset unless you have your Wi-Fi and equipment info handy.
• In SRP territory, check your demand response or time-of-use program settings, which can lower setpoints during peak windows.

If the heat works in Test but not in normal operation, a schedule or sensor is fighting you. Delete and recreate the schedule.

Gas Furnace: Common Reset Points

Many lockouts are caused by safeties doing their job. After a safe power cycle, check:

1. Condensate safety switch

   • High-efficiency furnaces produce water. A full condensate trap or stuck float switch will shut burners off. Empty and clean the trap if accessible, then reattempt heat.

2. Flame sensor

   • A dirty flame sensor makes the burner light for a second, then shut down. If you are comfortable, lightly polish the sensor with a clean scouring pad and reinstall. Do not bend it.

3. Pressure switch tubing

   • Cracked or dislodged rubber tubing can cause a no-fire condition. Re-seat loose tubing. If it is brittle, call for service.

4. Door switch

   • The cabinet door must be fully latched or the furnace will not run.

5. Pilot and igniter

   • Modern systems use hot-surface igniters. If it is cracked or never glows, it likely needs replacement by a pro.

If the furnace attempts three ignition cycles and locks out again, avoid repeated retries. That can flood the chamber with unburned gas. Call a licensed technician.

Heat Pump: Outdoor Unit Reset and Airflow Checks

Phoenix homes often rely on heat pumps or rooftop package units. When heat stops:

• Clear the outdoor coil

  • Dust and lint can choke the coil. With power off, gently rinse debris from the fins. Do not bend them.

• Check the defrost cycle

  • On cold desert nights, a brief cool-air blast can be normal during defrost. If it never recovers, the defrost board or sensor may be faulty.

• Inspect the disconnect

  • The outdoor pull-out disconnect must be fully seated. Monsoon storms or roof work can jar it loose.

• Verify the thermostat wiring configuration

  • If you recently swapped thermostats, make sure the O/B reversing valve wire is correctly assigned.

If the outdoor fan runs but there is no heat, the reversing valve or compressor may need professional care.

Water Heaters: Quick Reset Notes

Many no-heat calls are actually no hot water. For tank or tankless systems:

• Electric tank

  • Press the high-limit reset button on the upper thermostat under the access panel. Replace tripped breakers. If it trips again, call a pro.

• Gas tank

  • Relight instructions are on the label. If the pilot will not stay lit, the thermocouple or gas control valve may be failing.

• Tankless

  • Power cycle the unit and clear error codes per the manual. Descale if it has been more than a year, since Phoenix hard water is tough on heat exchangers.

The Phoenix Factor: Local Reasons Heaters Lock Out

• Dust loads are higher, so filters clog fast and pressure switches trip.
• Rooftop units see more sun and wind, which loosens disconnects and weathers wiring.
• SRP and APS smart thermostat programs can curtail heating during peak demand if settings are aggressive.

Local incentives can ease the cost of fixes and upgrades:

• SRP duct repair and testing rebates up to $400 for qualifying work.
• SRP smart thermostat rebate up to $100 for purchase and installation.
• Up to $3125 in federal tax credits and rebates for eligible HVAC replacements. Program rules apply.

Step-by-Step Troubleshooting Flow

1. Confirm power and settings

   • Thermostat Heat mode, setpoint +3, schedule off.

2. Reset power safely

   • Thermostat Off, breaker Off and On, furnace switch Off and On, wait 3 to 5 minutes.

3. Check airflow

   • Replace filter. Open all vents. Clear returns.

4. Address common safeties

   • Empty condensate trap. Confirm door switch latched. Inspect pressure switch tubing.

5. Observe and listen

   • Note any error lights or blink codes inside the furnace panel. Count blinks to tell your tech.

6. Test heat again

   • If it runs, let it cycle. If it locks out, stop and schedule service.

Prevent the Next No-Heat: Maintenance That Works

A careful tune-up reduces breakdowns and lowers bills. Professional maintenance typically includes:

• Combustion analysis and gas pressure verification
• Flame sensor cleaning and ignition check
• Heat exchanger and inducer inspection
• Filter and blower cleaning
• Condensate drain flush and trap cleanout
• Thermostat calibration and control board scan
• For heat pumps: refrigerant charge, defrost check, outdoor coil wash

Why it pays off in Phoenix:

• Fewer emergency calls on chilly desert nights
• Lower utility bills when airflow is restored and sensors are clean
• Longer equipment life thanks to reduced heat stress

Deer Valley Plumbing & Air Conditioning backs tune-ups with a 100 percent satisfaction guarantee and offers Annual Service Plans that keep you on schedule.

When to Call a Licensed Pro Immediately

• You smell gas or see any scorch marks
• The breaker trips more than once
• There are flashing error codes you cannot clear
• You have repeated short cycles or the system overheats
• There is water around the furnace or in the condensate pan

Professional diagnostics are fast and precise. Our $89 HVAC Repair Diagnostic includes an in-home evaluation, clear options before work begins, and our Next Day Guarantee. If a repair makes more sense to defer, we will tell you straight.

Repair vs. Replace: Make the Right Call

Consider replacement when:

• The furnace or heat pump is over 12 to 15 years old
• The heat exchanger is cracked or the compressor is failing
• Repair costs exceed 25 to 40 percent of replacement cost
• You want modern comfort and rebates that offset the price

Today’s systems deliver safer operation, quieter runs, and smarter control. Qualifying installations may be eligible for up to $3125 in combined incentives. We also offer 10 percent off all installations and financing options, subject to approval.

Proof You Can Trust the Work

• Licensed in Arizona: AZROC 083357 C-37, AZROC 259942 CR77, and C-39 355345
• BBB Accredited, fully insured, and family operated since 1989
• Upfront pricing and a written 100 percent satisfaction guarantee
• We work with your insurance when applicable

Homeowner Checklist: Quick Reset Summary

1. Heat mode on thermostat and setpoint +3
2. Breaker Off and On, furnace switch Off and On
3. Replace filter and open all vents
4. Empty or clear condensate trap
5. Reseat furnace door and thermostat faceplate
6. Observe for codes, then test heat for 5 minutes

If it does not hold, schedule a technician to prevent damage and downtime.

Special Offers to Get You Warm Faster

• Special Offer: $89 HVAC Repair Diagnostic with Next Day Guarantee. Call (602) 899-0899 and mention the $89 diagnostic offer.
• Special Offer: $89 HVAC Tune-Up Diagnostic with Next Day Guarantee. Book online or call (602) 899-0899.
• Special Offer: 10% off all installations. Call (602) 899-0899 to schedule and redeem.
• Bonus Savings: Diagnostic charge waived with purchase of service. Ask your technician.
• Rebates: Up to $3125 in rebates and credits for qualifying HVAC replacements. Eligibility varies.
• Add-On Savings: 20% off normal insulation pricing when added to an installation.

What Homeowners Are Saying

"Angel Mendoza was my technician he is very knowledgeable and spent time checking all connection and reviewed the entire system!! He was not able to make the furnace work so he called for warranty technician to come out!! I was very satisfied with his work!! He was very good and I would recommend this company for any HVAC work!!"
–Angel M., Phoenix

"Another great job by the Deer Valley experts! Today was an all-day appointment to install a new tankless hot water system. Remington was awesome as usual, and he brought along Jared White for his specific expertise in tankless systems. Jared was very courteous, answered all my questions, and both he and Remington walked me through how the system works and what work they performed for the installation. It seemed the two of them worked very well together, and it was obvious they are proud of their work."
–Jared W., Scottsdale

"Egzon O. was great. He was patient explaining exactly what he was doing. He is professional and knowledgeable. If I could have rated him with a 10, I would have done so. Will ask for him again should we need your service in the future! We are very satisfied with the installation of our tankless water heater!!"
–Egzon O., Glendale

Frequently Asked Questions

How do I reset my heating system safely?

Turn thermostat Off, flip the HVAC breaker Off and On, switch the furnace power Off and On, then set Heat and wait 3 to 5 minutes. Stop if breakers trip or you smell gas.

Why does my furnace keep locking out after a reset?

Dirty flame sensors, clogged filters, full condensate traps, or pressure switch issues can cause lockouts. If it fails three times, call a licensed technician.

Should I press the red reset button on my furnace?

Only once after verifying airflow and power. Repeated presses can flood the chamber with gas. If it trips again, schedule service.

Can a thermostat cause no heat?

Yes. Wrong mode, bad schedule, weak batteries, or wiring errors can block heat. Run the thermostat’s equipment test and reseat the faceplate.

Are there rebates for heating repairs or upgrades in Phoenix?

Yes. SRP offers duct and smart thermostat rebates. Eligible replacements may qualify for up to $3125 in federal incentives. Ask for current programs.

Wrap-Up: Get Heat Back the Right Way

You now know how to reset your heating system safely, fix common blocks, and spot warning signs. If your heater still will not run, schedule a fast diagnostic to protect your system and your comfort. Phoenix homes face unique dust and rooftop challenges, and our licensed team solves them daily.

Ready for Reliable Heat?

Call Deer Valley Plumbing & Air Conditioning at (602) 899-0899 or visit https://www.deervalleyplumbing.com/ to schedule your $89 HVAC Repair Diagnostic with Next Day Guarantee. Mention the 10% off installation offer if you are considering replacement. Serving Phoenix, Mesa, Glendale, Scottsdale, Peoria, Tempe, Surprise, Goodyear, Avondale, and Sun City.

Deer Valley Plumbing & Air Conditioning is family owned and serving the Valley since 1989. We are BBB Accredited, fully licensed and insured (AZROC 083357 C-37; AZROC 259942 CR77; C-39 355345). Expect upfront pricing, financing options, and our 100 percent satisfaction guarantee. We offer heating repairs, installations, tune-ups, duct services, smart thermostat installs, and gas line work. Local insight, fast response, and a Next Day Guarantee on select diagnostics set us apart.