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My furnace runs short cycles and blows warn air at best. Any ideas?

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Carrier Weathermaker 8000 - furnace does not ignite

having a problem with a weather maker 8000. It will not come on at all unless I shut down the switch on the side of the furnace. filters is clean. it will start to light then stop

Posted on Dec 20, 2008

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SOURCE: furnace blowing cold air


Posted on Jan 07, 2009

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SOURCE: furnace blowing 5 amp fuses

This is caused by a low voltage short. Most often it's the T-stat wires going to the condenser unit outside. Check to see if the insulation on the wires have degraded and replace them if necessary. Also, if the wire has been spliced before redue the joint and weather seal it so that it won't happen again. This is what I do for a living so if you have any more questions, please feel free to ask more questions.

Posted on Mar 21, 2009

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SOURCE: Blueway split system wall air conditioning doesn't work properly.

Hi,I have had problems with my Blueway A/C it was very cheap but NASTY,anyway I might be able to help, I made a website with my manual that includes the error codes that I could not find on the net anywhere ,I have also sourced a company in sydney who has spares and have the contact details listed and started a forum that we can help each other out with

Posted on Apr 05, 2009

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SOURCE: i have a tempstar combine air conditioner and

If the unit is around 6 years old then it could be the combustion air motor. If the unit is older then you need to inspect the heat exchanger for signs of cracks. Take the top off the unit to inspect. Check to see if the metal around the reset is hot and if it is then the switch is doing it's job. If the heat chamber is cracked then turn the gas off, because your home will have CO. This can kill you.

Posted on Jan 05, 2010

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Furnace keeps blowing fuse on the board that hosts low voltage wiring.. thats only when stat is operable. when stat is without batteries the fuse doesnt blow. furnace will try and run when i connect t

You may have multiple issues concerning the heat cycle, but the first that has to be resolved is the blowing fuse. The control circuit fuse blowing indicates a short somewhere in the low voltage wiring. IF the thermostat is newly installed, I would suggest first double checking ALL the low voltage wiring to make sure ALL the wires are connected correctly and to make sure the wire connected to the R terminal is not shorted to metal somewhere. If there is a C terminal, make sure R and C are not slightly bared and touching together.

Go to the furnace and note the location of the wires on the terminal strip. Remove them and install a TEMPORARY jumper across R and W. If the furnace comes on and begins the heat cycle without blowing the fuse, the problem is within the wiring or thermostat for sure. Remove the jumper and reinstall the wires. Go to the thermostat.

Remove the thermostat then take all the wires off of the sub base, taking note as to which wire went on which terminal. Take the R wire and the W wire and twist them together. The heater should come on indicating the problem is within the thermostat. Put the batteries in with a new fuse. If it blows, the sub base is the problem. If it doesn't blow, install the wire that goes to the R terminal. Check the fuse. Put the W wire on. Check the fuse. Put the G wire on. Check the fuse. Leave the thermostat on the chair, then turn the sub base 'fan on-auto' switch. Check the fuse. If its not blown by the time these three wires are installed, you inadvertently removed the 'short' by moving the wires around during this test. The remaining wires can be installed and the thermostat placed back on the sub base.

If you completed the above list and the fuse no longer blows and your furnace still only clicks, you obviously still have issues within the furnace of a mechanical nature. The clicking is the relays on the board initiating the combustion fan relay and attempting to initiate the pre-purge cycle. If the combustion fan hums and does not start, the fan could either be blocked (by a dead bird) or is mechanically shot and requires replacement. This fan HAS to start before the ignition process can begin. Solve that issue first after the blowing fuse issue is resolved. Its kinda rare that a system has so many issues at the same time. Usually when this is the case, someone replaced the thermostat and created that issue trying to resolve the underlying issue and the original cause for no heat.

This is NOT the professional way to troubleshoot it, but you are limited in your task without the proper analog or digital multimeter.

If you are unsure of your ability to systematically go through this process, abandon the idea and call a qualified service tech to bail you out.

Dec 31, 2014 | Heating & Cooling

1 Answer

Heil furnace blower motor stays on won't shut off at thermostat blows cold air continuously

Do you have t sat fan switch in on position??? If so blower will run continously set it to auto and it will cycle with heat call

Nov 12, 2012 | Heating & Cooling

1 Answer

The red light won't stay solid and blinks. the furnace won't cycle more than once or twice before it just won't go and it is not warming up to what the thermostat is set on. we have to flip the actual...

if it is three blinks then it should be the pressure switch, you can blow through the tube(both ways) and it should work. here is a thread I found:

here is a best site:

hopefully this will help you out, Good Luck Tim

Jan 16, 2011 | Goodman GDS80904BNA Open Flame Heater

1 Answer

My philco heater will short cycle and then sometimes just blow cold air


Here is a tip that will help you try to figure out why your furnace is not working.

Basic Furnace or Heating System Troubleshooting


Jan 04, 2011 | Heating & Cooling

1 Answer

Brand new furnace, transformer opens on primary side. also seems that transformer is hotter than normal. I have checked all componets for short to ground and have replaced control board.

The short is on the 24V side...I would put a 3 amp fuse in series with the Hot 24v line before it gets to the circuit board from the transformer you will have to replace again....have a few spare fuses....after having done that./...turn the power on and call for heat...Observe what happens and what stage of the cycle you're in when the fuse blows...Exhaust fan starts...Ignitor starts to warn up....etc...I need more info...shorts are hard enough to find as it is.......does it blow the fuse immediately...usually it will go through a few stages before you get to the problem piece....Make and Model of the furnace could also be helpful to me

Oct 31, 2009 | Heating & Cooling

1 Answer

Furnace wont run

First of all when you flip the switch, it goes thru a startup sequence. THEN it turns on the Igniter (notice the red glow). Then the gas turns on.

Now at this point check the idiot light and it should be giving you a code of 34. That 34 (3 shorts 4 longs) says that there was a problem igniting the furnace. After it cycles thru at least 4 times and fails to ignite all the blowers, then is when you get a code 14 (1 short 3 longs)

NOTICE what's happening with ALL the burner Tubes each time it attempts to ignite. If only one or two are running....then this is your problem.
To fix all you do is take out the burner Tubes, look for debris, blow them out (blow from the front where all the jets are), and replace them in sequence from left to right (the tabs overlap).

Jan 23, 2009 | Carrier XHB123D X/Y Series Heat/Cool Air...

1 Answer

Ruud achiever 90 plus gas furnace not blowing any heat

These new furnaces are trouble. Ive been in the htg trade for 25 yrs. The fan is running because they are now controlled by a timer instead of a temperature control. Rather than sensing a preset temperature and turning on the fan, it comes on by a preset time. Couple of things, does either of the doors have an inspection window? most newer furnaces have what is called a smart board. The board will flash a trouble code. ie: 1 long 2 short etc. #1 turn your thermostat to off, youll need 2 people for this! Go to the furnace, If it has the above mentioned inspection window ( usually about 2" round) while peering through the window have someone turn the thermostat to about 80 degrees. Let the furnace cycle and see if it flashes a code. If it does the codes are usually on the bottom door, May be on the inside. The most common cause is either a bad transformer, bad hot surface ignitor or pressure switch failure. Further questions feel free to ask. Steve

Dec 21, 2008 | LG LW1200ER Air Conditioner

1 Answer

Carrier Weathermaker 8000 - furnace does not ignite

having a problem with a weather maker 8000. It will not come on at all unless I shut down the switch on the side of the furnace. filters is clean. it will start to light then stop

Dec 10, 2008 | Heating & Cooling

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