Re: unit will not fire off when switch is turned on (kero...
I had the same problem and removed the heat adjusting panel and removed the two wires from the knob terminels and spliced the wires together with a wire nut and electric tape and the unit worked fine
hope it works for you as well
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There are several limit switches in the unit there in various places in burner compartment. One on blower housing . One thing that I would try is replaceing your filter and turn the power off to the furnace and try starting the system after power is D/C for 5 minutes.
Hi, when the combustion motor comes on, it should or will have a poly type tube on this motor that runs over to a pressure switch. This switch is where the other end of the hose connects. These switches get stuck open at times and have to be broke free by removing one end of the tube and blowing through it. This is a silver looking switch, could be different, but the contact in this switch will stick open causing the unit not to fire up. There is a sequence of operation on these units, 1st the combustion motor will pressurize the box and send pressure to the switch which closes. Once the switch closes, it will send 24 volts to the ignitor module to open the main gas vale to fire the burners. This is just one of several safety switches. This will solve your problem. You can also check this switch by jumping across it with a piece of insulated wire from terminal to terminal. It will fire right up. Sincerely, Shastalaker7 A/C, & Heating Contractor
it sounds like the low temp limit switch, the one that cools the furnace down with the burner off and the thermostat open, when it cools to a point the fan stops, the other switch in burner area turns burner off/on, hope this helps
Turn your gas valve on, but leave your unit unplugged for a few days. You can light your burners in the meantime with a lighter so you can cook. Usually this problem is caused by moisture getting into one of your ignitor switches which are under your burner knobs. Most of the time the switch dries out and you can plug your unit back in after a few days. If it still keeps firing then you will have to replace one or more of your ignitor switches. Usually a very difficult job as most gas cooktops are now sealed burner units which means the top of your cooktop is bolted down to the burners with several screws or nuts that heat up with usage and become almost impossible to remove, without having to drill out the screws, or chiseling off the nuts. Be careful of boilovers or cleaning around the knobs with too much water to prevent this from happening again. Also get a surge protector at least 2000 joules or higher to prevent damage to you spark module. Good Luck, Appliance Specialists
Make sure the exhaust fan is running.You say it fires up and then cut off.Does the main burner come on just the pilot?If it's just the pilot then I would say you need to replace sense that senser the pilot lite.Because onces that senser the flame the main gas vavle should open.for give me for my mis spelling.
unit needs photo cell,or cell is dirty.to check photo cell disconnect the two blue wires from reset switch nad put a wire between where the blue wires were connected.that takes the photo cell out of system.fire unit up.if it stays running photo cell is bad,change it and all will be right again