Question about Honeywell CT87B ROUND HEATING&COOLING MECHANICAL THERMOSTAT - WHITE Heater

1 Answer

Ruud furnace starts up burners shut down after 30 60 seconds

The furnace ignites and the burners work for various times, the first time was a bout 20 seconds, I cleaned the thermo coupler and the burners stayed on for almost a minute before shutting down.

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 148 Answers

Check the flame sensor it could be carboned up

Posted on May 02, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Furnace continues to short cycle over and over and over...


It could be two things flame sencor needs cleaning of conections not tight or the pressure switch is not working try jumping it out and see if it lights

Jan 15, 2013 | Heaters

1 Answer

Goodman furnace gmh95090cxac wont stay lit keeps clicking will lite then clicks back off what would be the problem


Hello, if the burners light but do not stay on for more than 10 seconds, I would clean the flame sensor. The flame sensor is a metal rod that is on the opposite side of the Igniter, sometimes it gets coated by oxidation and does not sense the burner flame and shuts the Furnace down. To clean to kill power to tje furnace, remove flame sensor and clean with a steel wool, then reinstall and start Furnce back up. If this does not work then most likely the Igniter is too weak to ignite the gas and will have ro be replaced.

Oct 29, 2012 | Heaters

1 Answer

Ruud 90 Plus Achiever furnace starts, ignites, runs for 30 seconds, goes out, then does it again and again.


Hi,
It would seem as though you have a bad flame sensor or the ground from the burner to the ignition control is bad...

Could be the ignition control also but not nearly as likely...

Pressure switch can also cause these problems...

Bottom line is that you will need to grab a meter and try to figure out what is causing the flame to cutout...

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

Basic Furnace or Heating System Troubleshooting

heatman101



Jan 14, 2011 | Heaters

1 Answer

Ruud Silhouette II Gas Furnace, purges, lights burners and burns until the blower starts and then burner stops and does not really blow very warm air. Once blower shuts off, it starts the process all over...


I would be looking at the heat exchanger. They are designed to have the heat from burnt fuel flow thru them. Cracking or pin holes will let the super heated air into the furnace interior and in there you have some over heating protection some look like buttons, older they look like an external thermostat, and these get the hot gas from the burners and trip then the furnace shuts down. When the furnace comes on again some times the blower will come right on because the sensor says hey this thing is hot when in fact it isn't. This also can and if bad enough will cause carbon monoxide poisoning, please inspect this closely or have a professional look at this. There is no price ever to great to replace a human life.Sorry probably not the answer you wanted but better safe than sorry!

Dec 20, 2010 | Heaters

1 Answer

Rheem Highboy Oil Furnace runs, then shuts down. I throw in a lit paper to burn off oil residual from failed start. Hit 'Reset' button and furnace starts up. It may start up by itself for the next 3...


Oil furnaces have certain items that routinely go bad or need adjusted to work properly.Some of the common things are nozzle, then gap and location of the igniter,then last is the fire eye. You can see all of these items by pulling the burner tray out. The nozzle delivers the fuel in two ways more or less, first is spray angle then second is the rate or GPH. Nozzles are to spray an atomized mist this means no heavy droplets of fuel. If you have large drops of oil chances are a new nozzle can help you out, please pay attention to spray angle and GPH. The igniter is next, after time they will wear and you can clean the rods and reset the gap to specified distance, that being said it also needs to be a certain distance from the atomized fuel to ignite properly all very important. Then last is the fire eye it tells the furnace that a flame is established and to deliver fuel or flame out and shuts fuel down. These will build carbon deposits at times so simply clean off the deposit and clean the lens with a soft cloth and windex reposition put the burner tray back in hook up the fuel line and off you go.

Dec 20, 2010 | Heaters

1 Answer

The Goodman Heater was installed in 2004. Thermostat set at 75F, the fan that blows CO2 out was on for about 1 minute, then I could hear the sound of the gas blowing into the furnace, but the ignitor...


Problem: Your furnace will not ignite the gas to produce heat for your home. When a furnace has a bad ignitor what I see most of the time is the following sequence of operation:


1. Thermostat calls for heat. 2. Draft inducer motor starts. 3. Pressure switch attached by a small plastic or rubber tube senses the negative pressure produced by the draft inducer and closes. 4. Draft inducer runs for 30 seconds to a minute before you hear a gas hissing sound. The ignitor did not glow, the flame sensor (a small metal probe about 1/8" in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the hissing sounds stops with no ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. Then the sequence starts all over again with no ignition of the gas. Solution:You probably need to purchase and install a new ignitor. I would suggest that you inspect your ignitor closely for cracks. Make sure you do not touch the ignitor with your bare hands. If you do not visually see a crack, then you could have a furnace control board problem or a limit, rollout switch problem. The furnace's control board might not be supplying the voltage to the ignitor. If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.

Nov 30, 2010 | Goodman GMS80903BNA Heater

2 Answers

Ruud Silhouette II Gas Furnace, purges, lights burners and burns until the blower starts and then burner stops and does not really blow very warm air. Once blower shuts off, it starts the process all over...


Flame sensor needs to be cleaned. turn off the furnace power switch or breaker. pull the flame sensor located in the burner runner section of the furnace. It will be easy to locate because it has 1 wire running to it. pull the screw being very careful not to harm anything else. get the sensor out. inspect it for cleanliness. clean the sensor with light grade sand paper gently. re-install the sensor plug the wire back on. restart your furnace and this should fix the problem.
CookHVACR

Nov 19, 2010 | Heaters

2 Answers

Lennox furnace 17 yeanrs old. flame comes on and the shuts down sometimes right away some times in a few minutes. We have the furnace go down to 58 at night. It takes all day to get back to 67.


Sounds like a dirty flame sensor.
Also 9 degrees is a large swing to recover. Most specialist will advise no more than a 5 degree set back, otherwise recovery time eliminates any savings you may achieve.

Dec 05, 2009 | Dayton (3E407) Heater

2 Answers

Ruud furnace Model URKA A030jK08 Code opt 589


Flip the lower panel over and look for a wiring diagram. On that diagram there will be a diagnostic chart. Let me know what 5 blinks represent. Then I want you to read on.

On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Nov 23, 2009 | Heaters

2 Answers

FURNACE COMES ON AND SHUTS DOWN WITHIN 15 SECONDS


On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control). When all else fails, check the ground connection for corrosion.

Nov 23, 2009 | Heaters

Not finding what you are looking for?
Heaters Logo

169 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honeywell Heaters Experts

Sean

Level 2 Expert

77 Answers

Gareth Cockram
Gareth Cockram

Level 3 Expert

657 Answers

yadayada
yadayada

Level 3 Expert

61037 Answers

Are you a Honeywell Heater Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...