Question about Heating & Cooling
Ignitor does not always come on
Ignitor could be breaking down and need replacing or it could be your pressure switch ,
Posted on Feb 18, 2012
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Posted on Jan 02, 2017
If the room air fan is always on you could have the thermostat in the On position rather than in the Auto position, You could have a bad fan relay or the furnace is a "Lock-out" mode. A Lock-out occurs when the furnace attempted to start but could not for some reason. The computer board logs an error code and blinks a number of times. There should be an error code chart where ever the wiring diagram is located in the furnace. It may give you an idea where to start looking if in Lock-out. Good luck.
Posted on Dec 03, 2009
Maybe, look for bad wiring connections and retighten the ground wires from circuit board to cabinet. Take a can of air and clean the burner tubes being careful not to blow on the igniter. Are ther any error codes blinking when it does not light? Read on for some more tips.
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).
Posted on Dec 29, 2009
May have a dirty flame rod. Look in the burner box at either the far right or far left for a probe that sticks in the flame of a burner. There will be only one wire going to it. This rod is a safety sensor that shuts off the gas if it does not sense flame within a few seconds. If you brush off the rod with a toothbrush or Scotch Brite pad it may take care of your problem. If not, make sure the flame travels from burner to burner quickly. The burner tray may need to be brushed off.
Posted on Jan 06, 2010
check air filter is clean and all floor vents are open and not blocked see what room stat is set at this could not be working at the temp you need , furnace might need servicing
Posted on Nov 27, 2010
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