Wednesday, 29 January 2014
Lance Waterbarger's Fall Maintenance Secrets - Furnace Burner

Nashville Interstate AC Service's technician, Lance Waterbarger, reveals three secrets as he completes a fall maintenance check on an 11-year-old York HVAC dual-fuel furnace in the basement of a customer's home. The unit is high efficiency and uses a heat pump and a gas furnace.  This video describes the maintenance checks Lance does on the burners for the gas furnace.  


1. Check the burners

Remove the cover from the metal housing around the burners.  There is a hot surface igniter on the left side and a flame sensor on the right side.  Fuel is ignited on the left and the flame will roll down the line towards the right.  If the flame sensor doesn’t sense a flame on the last burner, the burner will shut off and try again.  The flame sensor is one part of the safety equipment on a gas furnace.  Lance checks all the safeties.

2. Check the inducer motor and associated switches

Check the inducer motor and associated switches.  The inducer motor gets the air moving throughout the system, causing a "draft" (positive pressure), so that the combustion gases will travel up the flue.  If the inducer motor does not come on, the furnance will shut down as a safety mechanism.  There is a vacuum hose connected to a pressure switch or fan proofing switch to ensure that there is a draft for the flue.  The pressure switch sends a signal through two wires and tells the circuit board to initiate the heat sequence.  Check that the hose is not clogged up, and that the switch is closing.  Make sure the switch is sending a signal back to the main circuit board.

3. Check the air supply and flue

Be sure the air input pipe is not capped off or plugged up.  It needs to be pulling fresh air into the combustion chamber.  Check that the flue is exhausted to the outside.  If there are any breaks in either of these, or if they are plugged up, this would be a serious safety concern.

Posted on 01/29/2014 10:14 AM by Eddie Hutton
Thursday, 16 January 2014
Lance Waterbarger's Fall Maintenance Secrets - Condensate Drainage

Nashville Interstate AC Service's technician, Lance Waterbarger, reveals two secrets as he completes a fall maintenance check on an 11-year-old York HVAC dual-fuel furnace in the basement of a customer's home. The unit is high efficiency and uses a heat pump and a gas furnace. 


1. Check the condensate pump

Water that condenses during the operation of a heat pump or furnace needs to be pumped away, into a drain line.  The higher the efficiency of the unit, the more water will need to be pumped.  Check the pump to make sure it is working.  Make sure you have clean water and a clean reservoir in the pump.  If it is dirty, disassemble it and clean it.  Bacteria and algae can build up and prevent the condensate from draining.

2. Check the condensate drain line

Check to see where the condensate drain line goes.  The drain will freeze up if it goes out a window or is exposed in unprotected space.  If the line freezes, the water cannot drain out and the pump will back up and shut your unit off.  If your furnace quits during freezing weather, pipes in the house could freeze, causing them to burst, resulting in extensive water damage to your home.

Posted on 01/16/2014 8:00 AM by Eddie Hutton
Tuesday, 7 January 2014
Lance Waterbarger's Coil Cleaning Secrets


Nashville Interstate AC Service's technician, Lance Waterbarger, reveals six secrets as he completes a fall maintenance check on an 11-year-old York HVAC unit.  In this video, Lance demonstrates the six steps (listed below) he performed on the outside unit while cleaning the coils.  “If it was easy, everybody would be doing it,” he says!

  1. First, remove the screws holding the fan and fan guard assembly.

  2. Rest the fan guard with fan attached on the side of the unit out of the way so the coils can be reached from the inside. Remove any large debris like twigs and branches that may have gotten in the unit.

  3. Check all the wiring to make sure there aren’t any wires that touch the copper tubes. Make sure that anything that touches copper - like foam insulation or a wire strap – is secured out of the way. Over the life of the unit, the vibration from the unit will cause anything resting or hitting the copper to pop a hole in the copper pipe and cause a leak.

  4. Mix coil cleaner and water in a sprayer.If you’re doing the routine maintenance every six months as you should, you don’t need to make the coil cleaner mixture very strong.

  5. Spray the coil cleaner mixture onto the coils in the inside and wait for it to foam up. Then spray it on the outside of the coils.

  6. Using a garden hose, flush the coils from the inside to the outside with water.

Check out our other maintenance videos (click here) for more fall maintenance tips and secrets.

Posted on 01/07/2014 2:01 PM by Eddie Hutton

Important Tips & Advice



You often don't think about your heating or air-conditioning system until something goes wrong. But there is so much you can do to help keep your system from breaking down. We regularly post information to help you learn what you can do to keep your system running, to save money and energy.  Search our many posts, videos, and podcasts, for valuable information that is never a sales pitch. Subscribe to receive an email when something new is posted, so you won’t miss any important tips.

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Whether you’re talking about heating or cooling, repairing or replacing a system, you want a company that can advise you reliably based on what is in your best interest, not based on what is convenient or what earns them the most money (commissions). We'll help you choose the best solution to fit your needs. Check out our many posts at HVAC News You Can Use and our podcasts.

Going Green

We're concerned about the environment and know all the latest technologies - such as geothermal systems, LED lights, and smart thermostats - that can reduce energy and put more "green" in your pocket!  We've provided HVAC systems in certified LEED buildings and written many posts on ways to Go Green.

The Sign of Service

We are a repair company performing a full range of commercial and residential heating, air conditioning, energy management and comfort products service, maintenance, and installation. We are a locally-owned company serving Nashville-Davidson County and the surrounding counties including Williamson, Rutherford, Wilson, Sumner, Robertson, and Cheatham.

Who We Are

Our service technicians are fully trained and experienced.  We can tackle the most complicated system to the simplest of systems – from large commercial plants to single-family homes.  Our ownership group of Eddie Hutton, Tony Anderson, Roger Eldridge,  Swaney Powers and Alan Seilbeck have over 125 years combined experience as leaders in the HVAC industry.


We are proud of our dispatchers that respond to your telephone call. When your system is down they make things happen. Our trucks are loaded with most parts needed for a quick repair. You can call day and night 7 days a week. Our normal weekday hours are 7:00AM to 5:00PM. Click on the button below to schedule a service call online. Emails and forms can only be answered weekdays from 7-5.”  

615-832-8500 Online Service Call


Did you know you should service your HVAC on a regular schedule – just like you would your car?  We have specialized maintenance programs to ensure the clean, energy efficient and safe operation of your HVAC systems.  This helps minimize service interruptions/breakdowns and maximize your equipment's lifespan.  All maintenance contract customers are assigned a primary technician that will get to know your facility and equipment and will treat it like his own.  You’ll receive discounts on repairs or new installations, and get priority service when it is cold or hot outside and you need service promptly.  Plus, maintenance contract customers are never charged overtime rates for emergency services after-hours, weekends or holidays. We’ll teach you how to save on maintenance costs by showing you things you can do yourself and when you need a technician. Here are some good posts:  Repair vs. Replace, Things to Try Before Calling for Service, Springtime Tips that Pay Off.


Our team takes on HVAC projects for office, school, retail and industrial facilities. Check out these case studies:

Replacement of a 250-ton Cooling Tower

Ductless HVAC at Brentwood Middle School