Gas and Oil Home Heating Furnaces - Blower works, but doesn't fire up = no heat
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jegusa
12-01-05, 09:27 PM
Turning on the thermostat, I got no furnace reaction (it has worked before but I haven't tested it in a while). Followed operating furnace instructions which is gas-fired. No reaction. I followed the thermostat wire from the panel to the joists and saw that the nonmetallic sheathed wire coming out of the panel was spliced to an old cloth insulation wire which ran up to the thermostat. A wire nut had been knocked loose (no junction box) of the splice and so there were loose wires.
I spliced them back together but am not sure I did the right ones. The nonmetallic sheathed wire had a green, red and white wire and the cloth insulation has a drk. brown, drk. blue and grey sheathed wire.
When I put the panel back on momentarily, the plastic extension, when pushed on by the panel fired up the gas and the blower came on. However, I had to mess w/ the panel a wee bit to get it on correctly causing the plastic extension to get pushed and bounced back several times (when bouncing back, the blower stops). Since then, the heat will not come on but the blower is working. When stopping and starting the furnace via the metal toggle switch on the side, no flames ignite. The blower does not respond to the thermostat (an old Honeywell). I ended up shutting off the blower. Meanwhile we're freezing!!!
Any ideas on what could be happening??
I spliced them back together but am not sure I did the right ones. The nonmetallic sheathed wire had a green, red and white wire and the cloth insulation has a drk. brown, drk. blue and grey sheathed wire.
When I put the panel back on momentarily, the plastic extension, when pushed on by the panel fired up the gas and the blower came on. However, I had to mess w/ the panel a wee bit to get it on correctly causing the plastic extension to get pushed and bounced back several times (when bouncing back, the blower stops). Since then, the heat will not come on but the blower is working. When stopping and starting the furnace via the metal toggle switch on the side, no flames ignite. The blower does not respond to the thermostat (an old Honeywell). I ended up shutting off the blower. Meanwhile we're freezing!!!
Any ideas on what could be happening??
Jay11J
12-02-05, 04:07 PM
You may want to make note on what wire is to what letter at the t-stat sub base. then make sure it's the same (color to color at your splice) t the furnace.. (Example R to Red to brown to R at furnace)
I am not sure what you mean by the plastic thing.. Is it the door safty switch ? Make sure the door/panel is in place all the way.
I am not sure what you mean by the plastic thing.. Is it the door safty switch ? Make sure the door/panel is in place all the way.
ecman1
12-02-05, 04:32 PM
Do you have a 'heat only' furnace and an ordinary thermostat?
Tell us more about the furnace: Age, type, kind of ignition/pilot system.
You can easily check to see if you have continuity running through the circuit of the thermostat . Do you own a voltmeter? If not, you could take a small piece of wire and jumper the terminals on the furnace where your thermostat wires come into the furnace. That way you would know you have thermostat function to at least see if that or the thermosat wiring/splices is your problem.
Tell us more about the furnace: Age, type, kind of ignition/pilot system.
You can easily check to see if you have continuity running through the circuit of the thermostat . Do you own a voltmeter? If not, you could take a small piece of wire and jumper the terminals on the furnace where your thermostat wires come into the furnace. That way you would know you have thermostat function to at least see if that or the thermosat wiring/splices is your problem.