Question about Heaters

3 Answers

No ignition exaust fan comes on then blower comes on but does not ignite

Posted by on

3 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 110 Answers

Hiya! If your heater has a pilot, it may be out. If it has an electronic ignition, the issue could be one of a few things, including:

Low/no gas supply (Natural Gas or LP?)

Malfuntioning regulator - If you're having this issue often, it would pay to have the gas company come out and check your regulator to make sure it's not overpressurizing your house lines; the gas company usually owns the regulator, so the inspection and/or should be free

Malfunctioning electronic ignition - To check this, cut the power to your furnace and find a spot where you can get a clear point of view to the ignition tip. Turn on the heater and listen for the cycles as you watch; Fan, Blower, then you should hear the ignition start clicking as it lights the pilot. If you don't hear any clicking or don't see a small arc at the ignition tip at all, your ignition module is malfunctioning. If you do hear clicking/see arc, this probably isn't the culprit.

Good luck!

Posted on Feb 19, 2008

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Brigadier General:

    An expert that has over 10,000 points.

  • Heaters Master
  • 3,614 Answers

Hi Sir,

Posted on Feb 19, 2008


  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 19,396 Answers

Check this page its a discussion on your same problem. I think it can help.

regards

http://ask.metafilter.com/48886/Help-me-fix-my-heater

Posted on Feb 19, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

I have a coleman 7956c856 direct vent forced air furnace it ignites fine but the blower wont kick on


main fan should come on once furnace has heated up to supply hot air to the house. make sure proper voltage going to the fan. fan relay in board may be shot

Jan 29, 2014 | Goodman GMS90703BXA Heater

1 Answer

The heater will not ignite in order to heat our home. The fan is still working, however the flames that usually light up to heat the air are not turning on.


Check for a codeon the control board. Also while the system is trying to start up, do you see the ignighter glowing, If not prolem could be a bad igniter. Problem could also be an obstruction in the exaust pipe, if this is the first time of the season it is turned on, and it is not firing, check to see if a bird got into the exaust pipe that vents to the outside. You need to provide more information, such as a code to troubleshoot this problem.

Dec 15, 2010 | Goodman GMS90703BXA Heater

1 Answer

Fan comes one, should hear whooshing of ignition,


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).

Jan 27, 2010 | Goodman Heaters

1 Answer

The blower fan comes on several minutes before the


Bad fan switch. It may also be called a fan limit switch. If your furnace is less than 5 years old, the switch is part of the circuit board and you will need to replace the board.

Jan 11, 2010 | Heaters

2 Answers

The burner never ignites


the clicker, sends a small electric spark (like a little lightning) at the tip of the burner. if it doesn't hit the tip, it wont ignite. check and adjust.

May 10, 2009 | Heaters

1 Answer

Heater will not light,ignighter glows,fan comes on,wont light,then shuts off


If your igniter comes on but no ignition, that eliminates the possibility of a bad or clogged pressure switch, high limit or flame rollout switch. Sounds to me like you have a control board, or a gas valve going bad. Could even be some loose, corroded, or faulty wiring. Before the igniter comes on the furnace does a self diagnostics to ensure everything is working, or the furnace will not make it to the igniter sequence. Inducer motor, pressure switch/s, limit controls are closed…then comes on the ignitier, gas valve opens, pilot runners and burners ignite, flame sensor detects the flame, blower comes on and all operations are working.

Hope this helps

Nov 30, 2008 | Heaters

1 Answer

Blower on colman gas furnace will not come on. (have no gas yet)


I'm not a furnace technician. But I have worked on several Coleman trailer furnaces. So keep in mind that my terminology might not be exactly correct. But I think I can help you.

I don't know what model you are running, but most of them run pretty much the same. You have a four basic components to check. Thermostat; Ignition Control Module; Pressure Switch; and which ever of the following that you have (Glow plug, Electronic ignition, Pilot Light).

I'm assuming that you are referring to the blower as the "Rat wheel blower" (round wheel looking thing with fins on it). If my assumption is correct and if the power from the breaker box to the furnace junction box (Probably with a on and off switch on top or side), than when you give it power (from breaker box and turn thermostat up) the fan (not blower) comes on. If it doesn't there is a probably a problem with your Thermostat or Ignition Module. If it does come on and your glow plug or you igniter tries to work. Than yes, you are correct, you have to have gas pressure to let the pressure switch know that there is adequate gas supply pressure (gas- 5 to 7 W.C, propane 11 to 13 W.C). The reason for this is if the Pressure Switch doesn't feel the correct pressure. It thinks you have a leak and won't release gas for ignition. After you turn the gas on. If the furnace doesn't ignite. Make sure the Thermostat is definitely wired properly. Now we are down to one of three problems. If the Glow Plug, Electronic Ignition, or pilot light are working properly. Than we are down one of two problems. The Ignition Module or Pressure Switch. Check pressure on the Pressure Switch. If yuou don't smell gas it is probably OK. But it is best if you use a manometer. I have rarely found Pressure Switches bad. Normally if I get to that step. It is the Ignition Module. The Ignition Module kind of like the brain of the furnace. It is located behind one of your front panels. It will have approximately 10 wires going to it. Some will be going to the Thermostat, some to the Glow plug (Igniter), some to the Pressure Switch, and some going to the blower.

I have probably said more than you need to know. If I did I apologize. But to wrap it up. You were probably correct. You definitely need gas for the blower to kick on. The furnace has to light and heat up before the blower will Start. Not to keep rattling, but to check to see if the blower motor will run. Is to switch the Thermostat from "auto" to "run".

Good Luck

Nov 17, 2008 | Coleman Propane Forced Air Heater...

2 Answers

BLOWER FAN WONT SHUT OFF WHEN THERMOSTATE IS OFF


The compressor coming on when the contact is pushed is o.k. they all do that. As for the blower fan not shutting off, some brands (Payne for example) the heating fan relay is a n.c. (normally closed ) relay. so if the time delay relay or thermal link are bad or not connected, the fan will blow even when it is turned off.

Aug 19, 2007 | Honeywell CT87B ROUND HEATING&COOLING...

Not finding what you are looking for?
Heaters Logo

Related Topics:

162 people viewed this question

Ask a Question

Usually answered in minutes!

Top Heaters Experts

paulcarew

Level 3 Expert

1904 Answers

Dan Webster
Dan Webster

Level 3 Expert

8147 Answers

Mack Baxter

Level 3 Expert

379 Answers

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

Answer questions

Manuals & User Guides

Loading...