Saddleback Plumbing Heating & Air Blog: Posts Tagged ‘Heating Repair’

Heating Tip 4: How to Check a Gas Furnace Draft Pressure Switch

Monday, December 12th, 2011

There are many reasons why a furnace stops working and in many cases, a Woodbridge homeowner can perform some simple diagnostics to pinpoint the problem. Finding the problem is one thing – fixing it is another. When in doubt, don’t try it yourself. Call a heating contractor.

But let’s look at one possible problem and solution you may be able to perform yourself – testing the draft pressure switch. The draft pressure switch on a gas furnace allows an electrical current to pass through to ignite the furnace. The pressure switch monitors the draft conditions and won’t allow the furnace’s gas valve to open unless draft is correct.

If the switch is malfunctioning, so too will (or will not) the furnace.

The best way to locate the switch is by consulting with your owner’s manual or by going online and simply typing in the words “gas furnace draft switch.” It is identifiable by its round size and is bolted to the outside of the furnace. It should be nearby the draft inducer motor because the two are connected by a metal tube. The tube may sometimes be the culprit, too. A tube that is blocked with condensation may cause the switch to go bad.

To check for proper function, first turn off power to the furnace, either by shutting down the ‘on’ switch at the furnace or shutting off the circuit breaker.

Use a volt ohm meter to check if the switch is opening and closing properly. Start by zeroing out the meter’s probes by touching the tips together. Using the dial (could be analog or digital), set the meter to 24 volts. Ground the black probe by attaching it to any metal part of the furnace. Then place the end of the red probe on the metal tube connecting the draft pressure switch to the draft inducer motor.

If the switch is working properly the meter should read at least 24 volts, or very near that. If the reading is short of 24 volts, the switch is not working correctly. At that point you may decide to replace it or call a professional to do the task (recommended).

Always remember that there are many sources which will help you diagnose and repair a problem, especially those available through the Internet. If you search YouTube.com you will find many videos advising you on how to repair certain components. Use all of the resources available to you and keep the phone number of a qualified and professional heating and cooling contractor nearby.

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Why is My Furnace Turning On and Off? A Question from Laguna Beach

Friday, December 2nd, 2011

One of the most annoying things your furnace can do is to constantly keep turning on and off. This on-off cycling keeps your Laguna Beach home from heating up properly. This action – called short cycling – also requires more electricity and drives up utility bills.

Short cycling is caused by an overheated furnace, which triggers safety mechanisms and shuts down the furnace. After a brief interval and cooling down, the furnace starts up again the cycle keeps repeating itself. Not only is it an annoyance, it can also signal more serious problems. A leaking heat exchanger can cause a furnace to overheat – and produce deadly carbon monoxide gas.

If a furnace is working too hard and overheating, it is usually because of airflow in and out. Your home’s ventilation system needs to be clear of dirt, dust, and debris. The more blockage in your ductwork and vents, the more friction is created, slowing down airflow and ultimately ending with an overworked furnace that continues to cycle on and off. And a blocked exhaust vent, such as a chimney or dedicated exhaust vent, can also cause a furnace to work harder. Check for things like leaves or bird’s nests.

The blockage may also be coming from a clogged furnace filter. You should clean or replace your furnace filter after a visual inspection reveals any type of build-up of dust or dirt. Do this at least every three-six months.

If you have a two-speed fan on your furnace, it is recommended that you run the fan in low speed during the cold months and high speed in the warm months. The reason? Warm air is lighter and takes less force to move.

There are other measures to take to prevent short cycling but these usually require a professional heating and cooling service technician to correct the problem. If in doubt, call your local qualified heating and cooling contractor and schedule a furnace inspection. Don’t make your furnace work any harder than it was designed for – and keep your home’s occupants comfortable and safe.

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Warning Signs of a Broken Furnace: Some Pointers from Coto de Caza

Wednesday, November 9th, 2011

How do you know when your furnace is “on the fritz?” There are warning signs of a broken furnace and some are recognizable – but not all. A broken furnace not only deprives your Coto de Caza home of heat and comfort, it also can be deadly, too.

Let’s look at some of the warning signs.

Each year, hundreds of people die and many more are injured from the most common household poison: carbon monoxide. This colorless and odorless poisonous gas comes from several sources and the furnace is the most common source of all; more precisely a broken or malfunctioning furnace. Carbon monoxide is a result of incomplete combustion of a fossil fuel, which is when a fuel does not burn correctly or completely. In a furnace, carbon monoxide gas comes from a poorly operating burner or a cracked heat exchanger. A properly tuned and maintained furnace greatly reduces the risk of carbon monoxide poisoning.

Since carbon monoxide gas is colorless and odorless, it can go undetected. It can make people sleepy and create flu-like symptoms. Sometimes a person may fall asleep and never wake up. But there are warning signs. Drowsiness, vomiting, or flu-like symptoms are a warning sign. Regularly scheduled maintenance of your furnace by a qualified heating and cooling professional and installation of carbon monoxide detectors can reduce the risk of falling ill to carbon monoxide gas.

Another warning sign is a higher energy bill. Sometimes you can’t detect a problem right away because, like carbon monoxide, there may be no obvious signs. Higher utility bills can be a sure sign of a furnace that is working too hard and running more than usual. This may be a result of clogged or dirty air vents, or dirty filters. If your monthly bills are higher than those of the previous year, it may not just be because gas prices are higher.

There are other warning signs of a broken furnace, too. The most obvious is the failure of your furnace to bring your home up to the desired thermostat settings or to maintain an even temperature. Cold or uncomfortable houses are sure signs of a broken furnace. The furnace may cycle on or off, causing an uneven or inconsistent flow of heated air. This can be because of a poor blower or a clogged furnace filter. If you don’t feel any moving heated air or detect any unusual odors or smells coming from your heating vents, that’s a sure sign of a broken or malfunctioning furnace.

A broken or cracked gas line can emit odors and can cause a furnace to malfunction, too.

Don’t take a chance of losing heat and comfort this winter. At the first possible warning sign, call your local heating professional for a heating system tune-up.

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