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The most common is as follows: w-white is for heating, b-blue for common, R-RED 24 VOLT power, y-yellow for a/c, G-Green for indoor fan. You need to make sure the indoor air handler/furnace etc has...

TO all: HVAC1000 IS EXACTLY RIGHT. Temp. does effect pressure ,and it could have been overcharged but you cannot always go by the #amount on the name plate , that amount is the factory charge which...

HVAC1000 is right it would take way too much time to explain all you need to know about laying out your duct system here. Im sure all want to help anyway we can but sometimes things are just to...

Metal duct is great ! But flex duct is cheaper and easier to install . You will need 1-start collar, box of flex duct 6" or 8" panduit straps,mastic,tape panduit tension tool, for flex duct. And...

Anytime you change a motor you should change the capacitor. Cut the system off and change the capacitor before the new motor burns up

After your sure there are no more restrictions to airflow and a clean filter then try cutting power from furnace completely off (t-stat to off) for about 2-5 miniutes then back on this will reset the...

Check your air filter, a dirty air filter can cause it to over heat and kick off the high limit. Also check your duct work make sure there are no restrictions for air flow, no kinks or drooping,...

Thanks, T-top, I have went on line and printed the 100 sample test questions for study, Like I mentioned I have taken it privously but this time I want to be more prepared. Thanks for your input

Sounds like your being taken for a ride, Its true that if refrigerant was added then it is ether got a leak in the system or the unit was not properly charged to begin with. Most units come from...

Hi, have only been in the hvac field for about two years now. I have taken the Nate test about a year ago around May 2007 I passed the core but was unable to pass the specialty. I want to retake...

Just as hvac1000 said it would be very hard, or close to impossible to analyze your problem without looking at the furnace directly, but the way you described things it sounds like it could possibly...

GAS FURNACE? If so what type of ignition, Standing pilot which has an actual flame that stays lit all the time, a hot surface ignightor which is a plug lige device which glows cherry red and...

We have a lexmark wireless printer with a linksys router Our computer is a dell laptop w/xp home edition, MSOffice 2007. Sometimes it will print fine with no problems at all then the next thing I...

Just a recommendation that you might find helpful for future referance. You can go to "Angies list .com" and see a list of recommended contrators also check the company out by asking for referrals...

What type of system do you have? Heat pump, gas package unit, Split system? In a package unit its one big unilt and the heat and air is both in the same unit. In a split system you have a unit...

If your furnace does not have a pilot (small flame) but a hot surface ignightor or a high voltage spark across two electrodes check and make sure your gas valve is turned to on posistion as well as...

Are you saying that your pilot does not stay lit that it lights and then goes out, it could be that the thermocople is bad if that is the symptom your having, those are fairly simple to replace if...

The trane xl series is a pretty good unit, the XL1400 AND THE XL 1600 ARE BOTH GOOD UNITS the can also be purchased with a variable speed air handler. The xl16i is a two stage coolling

I am, what's your freaking problem! You're the one that seems to have developed an attitude just because you did not have the right sollution to the problem. And no i am not a seasoned veterian in...

Yes I did try the compressor by pushing in the contactor it was fine it would have started should there have been low voltage to pull in the contactor. And I know the transformer is good due to the...

I still have not heard what others may think the problem is It is not a grounded wire Ihave checked that.ge1223

What type of system is it (heat pump,gas heat, oil heat etc) SINCE YOU SAID IT ONLY HAS 4 wires I take it for granted its not a heat pump which would need a minimum of 5 wires and 6 if the t stat...

Take the cover of the t-stat off and plce a jumper between the R terminal and the y terminal if the compressor comes on remove the jumper relace the cover and turn the t -stat to cooling with the...

HVAC 1000 IS absolutely right it could be any nuber of things but first thing you need to check is the actual pressue itself and the temperature to verify you are getting an accurate code reading....

The only advice I can give is what I have found to be the only real help. Trust me I have been through some real bad sitiuations. My advice is found in the bible in proverbs 3:5,6 "Trust in the Lord...

The bible does say that "all of our rightousness is as filthy rags " and "ther is a way which seemth right unto a man but the end thereof is the way of death" WHY? Because "through the disobedience...

A lot of times some Evaporator coils smell when the heat pump goes into defrost the smell is the aluminum in the coil when the hot gas of the refigerant flows through the coil. The only way to rid...

You can do this but it will take away some of the cfms (air flow)from the main supply trunk how much depends on the stattic pressue of the blower. You can you can change the blower(indoor fan) speed...

Sometimes the pilot assembly can get carbon built up and will block the gas flow. If it has a themocouple then try replacing it. Or you may try taking the pilot assembly out and cleanning it with...

Troubleshooting a carrier air handler heat pump system . Outdoor unit is a goodman. No voltage between common and red outside as well as inside air handler Standing refrigerant pressure reading 75psi...