Question about Heating & Cooling
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Posted on Jan 02, 2017
SOURCE: Furnace will not heat.
Most of the Lennox G-16s that I have repaired were having problems with the gray Penn-Johnson Piggyback igniton control module.
This is best repaired by replacing the spark module. Sometimes it may be neccesary to replace the gas valve also. Lennox updated to a ROBERTSHAW ignition system. Honeywell can also be used.
Also check that there is no water in the pressure switch or tube.
Hope this helps.
Posted on Jan 15, 2009
SOURCE: Air and heat not working!
check to see if thermostats take batteries pull the cover off and check and change them if they do. if they don't take batteries there will be a wire hooked to terminal C on the t stat. if they are new t stats they need to be programmed for your equiptment in order to work. some new digitals have a 5 minute delay after you set them. when it's in the delay HEAT or COOL will flash off and on, if it is actually calling for either one the words will be solid.
Test the thermostat: TURN POWSER OFF TO FURNACE. either at breaker box or switch mounted on furnace. make sure the door panels are all on furnace cause there is a door switch on the bottom panel that cuts power if it isn't pushed in.
while you have the cover off the t stat if the
batteries didn't fix it take wires from R and W and wire nut them together. the heat should come on after you return power to furnace
and/or making sure the power is back off
take wires off R G and Y terminals and wire nut them together AC should come on. if they do come on you have a bad t stat. if not you are losing voltage somewhere. either at the breaker box or furnace. a fuse could be blown on the circuit board on the furnace. if the fuse is blown you have a short in the stat wire. also check the fuse on that furnace switch we talked about earlier. if you have a volt meter take the bottom door panel off furnace making sure you push and hold that door switch in with a piece of tape. see if you have 120 volts going into the transformer the wires to test will be black and white. if so check to see if you have 24 volts accross the other two wires on the transformer if so see if you have 24 volts on the terminals R and C on furnace board. if so put a jumper wire on R and W heat should come on. if not it's the circuit board. any where you lose voltage is the part that is bad.
Posted on Aug 08, 2009
i personally would get an engineer to fix it , but this is the module you may need
Posted on Oct 21, 2009
You can sand the flame sensor but it sounds like another problem. Sounds like a limit switch or something in the control circuit, You need to have a service tech look at this. Ask for free estimate on repair. I have worked on hundreds of these units and they are sometimes tricky to work on. Lenox has come up with new controls for the whisper heat furnace to replace the old ones. If the flame sensor is bad the unit will try to light a few times and lock out and you ahve to kull power to the furnace to reset. If this is whats happening clean the sensor nd you should be ok If not you need help from a service tech.Rus
Posted on Nov 11, 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
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