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Furnace fan causing static on phone, speakers, TV?
We have a forced-air furnace that we use year round to either heat or cool the house. In the summer months, it pumps cool air from a central air system. In the winter, it switches to heat by oil.
This year when we started the heating cycle, we noticed that we now get a hissing sound from our computer speakers, snow on one of the two TV screens, and noise on the home phone line. This only happens as the furnace fan cyles off (ie. as it is coming to the end of its blowing cycle).
Weird thing is the PC speakers are plugged into an isolated and protected circuit, so I am pretty sure it is not a surge or drain issue within the power lines. My first guess was some cabling is passing too close to the furnace and receiving electromagnetic interference.
Just wondering if anyone has had something similar and what they may have had to do to correct it. Thx.
3 Answers
- 1 decade agoFavorite Answer
Could be a couple of things: As mentioned, the motor is going bad, which is the most likely. It's also possible that there is a problem with a loose ground or neutral on the circuit that the furnace is on(but not very likely). Keep in mind that if your furnace is fairly new it might have a second electric motor, the induced draft blower, that only operates in heating that also may be the culprit. But this is only if it is a gas furnace.
I'd say it's the main blower motor, you may not notice the problems when it runs in cooling because it will have a multi-speed motor and the unit runs in different speeds for heating and cooling so the problem may be that you are losing one speed on the motor. either way you have to change the motor.
- ?Lv 44 years ago
hi Tabitha, I have a tendency to believe T C's answer. you need to be ok. see you later because the status water interior the basement is lengthy previous; i anticipate the capacity and sump pump got here decrease back on and also you wiped clean up the mess; you need to be ok. There should be a removeable panel at the front of the furnace. get rid of it and examine for status water. should be dry by now. honestly, get rid of the former clear out, probable shot, and replace it (very low-priced). you need to work out it protruding of the ductwork only earlier the furnace or, on older furnaces, only contained in the removeable panel. The previous clear out could have the size printed on it (16" x 25"; 14" x 22"; and so on.). examine the "Arrow" markings on the recent clear out to be confident you position in it properly (Arrow direcction in the route of the furnace). if you're uncomfortable doing this, ask round to acquaintances or kin and also you need to get some help with out calling a Heating agency $$$. it really is common... except you've by no skill done it earlier. 3" of water probable by no skill were given as a lot because the bright elements. provide it a attempt. If there is no water contained in the furnace, turn the thermostat to warmth, modify the temp placing more beneficial and word if it comes on. If it doesn't paintings then, yeah, call a specialist, yet from what you reported, you need to be good to bypass. so a thoughts as the different suggestion, Battery decrease back-up, mold, de-humidifier, perchance a decrease back-up generator, different precautions... convinced; yet i'm only searching on the instant problem. GL
- 1 decade ago
Did you try plugging your furnace blower's motor into an Isobar? (this is a product that will isolate your EMI from the electrical motor).
It's possible that your furnace's blower motor is nearing the end of its life cycle. Perhaps replacing it would be cheaper than the "Tripplite Isobar" device.