If you have a pilot light but no hot air, you'd likely smell gas, the gas not getting to your pilot light to ignite the thing-a-ma-gig that sends out the heat. I'll ask someone about this.
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Gas furnace blows cold air continuously
I have a natural gas furnace made by Heil. The model number is NTC6075FBA1. The serial number is L984120332.
A few times over the past year, I've noticed the furnace blowing cold air constantly. I "solved" the problem by shutting off the furnace via the circuit breaker, and then turning it on again a few hours later. Unfortunately, this method doesn't work anymore.
The furnace constantly blows cold air, and the heat never comes on. The thermostat was an old-fashioned dial-type model. I replaced it with a modern electronic thermostat made by Honeywell. Didn't make any difference. Changing the temperature-setting on the thermostat has no effect.
When I take off the upper panel of the furnace while it's blowing, it looks to me like there is a pilot light burning. But I don't know anything about furnaces, so I don't know what else to look for.
The house is getting cold, and I can't really afford to get a repairman right now. Thanks in advance for considering this question.
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Answers
http://www.heatpro.us/serv
Flame sensors or pressure sensor's could be your problem source.
Thanks for the suggestions. I opened the panel, jiggled all the wires around, cleaned the area a bit, and reseated some of the connections. After I did that, the furnace started working properly.
However, I'm still concerned that this problem will recur in the middle of February during sub-arctic temperatures, so I think I'll have to bring in a repairman at some point, anyway.
It sounds like the electrical contacts may need to be cleaned or re-seated. The thermostat makes the decision to turn on the feed to the furnace, and sends the signal to the unit. By your description, you have loose contacts at the furnace. Follow the thermostat wires to where they connect on the unit. They may be rusty or worn. Depending on the type of connection, they could be soldered, or be connected via a clip of some sort. You can clean contacts with a pencil eraser, and you can crimp contacts with a needle-nose plier to make the connections seat tighter.
If it's soldered, you may have broken solder balls, which you'd need to remove the old solder and reconnect with a soldering iron and new solder.
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by: chernavskyPosted on 2009-11-01 at 07:57:09ID: 25714118
Increased point value