A lightning strike last night blew out a transformer in our
area. We didn't lose our power, but we must have gotten some kind of
surge damage. I have a gas furnace and an a/c. The fan will not turn
off now, even when I set the fan to "auto" and the thermostat to
"off". I replaced the thermostat, thinking it had gotten fried, but I
still have the same problem. Plus, the furnace is getting very hot to
the touch, even though the chiller is working and cool air is coming
out of the vents. What else could be the matter? Thanks.


--
bruce
The dignified don't even enter in the game.
-- The Jam

http://tinyurl.com/4sarw | http://www.cafepress.com/notdifficult
http://postingwillbelight.blogspot.com
http://atlantarofters.blogspot.com
http://is-3.blogspot.com

The Sanity Inspector wrote:
A lightning strike last night blew out a transformer in our
area. We didn't lose our power, but we must have gotten some kind of
surge damage. I have a gas furnace and an a/c. The fan will not turn
off now, even when I set the fan to "auto" and the thermostat to
"off". I replaced the thermostat, thinking it had gotten fried, but I
still have the same problem. Plus, the furnace is getting very hot to
the touch, even though the chiller is working and cool air is coming
out of the vents. What else could be the matter? Thanks.


--
bruce
The dignified don't even enter in the game.
-- The Jam

http://tinyurl.com/4sarw | http://www.cafepress.com/notdifficult
http://postingwillbelight.blogspot.com
http://atlantarofters.blogspot.com
http://is-3.blogspot.com
Hi,
First thing I'd do would be to turn off the circuit breaker to reset the
control logic board in the furnace. And see if everything comes back to
normal. Did you replace thermostat after turning off the breaker?
Think logic, first thing first in trouble-shooting.

The Sanity Inspector wrote:

A lightning strike last night blew out a transformer in our
area. We didn't lose our power, but we must have gotten some kind of
surge damage. I have a gas furnace and an a/c. The fan will not turn
off now, even when I set the fan to "auto" and the thermostat to
"off". I replaced the thermostat, thinking it had gotten fried, but I
still have the same problem. Plus, the furnace is getting very hot to
the touch, even though the chiller is working and cool air is coming
out of the vents. What else could be the matter? Thanks.


--
bruce
The dignified don't even enter in the game.
-- The Jam

http://tinyurl.com/4sarw | http://www.cafepress.com/notdifficult
http://postingwillbelight.blogspot.com
http://atlantarofters.blogspot.com
http://is-3.blogspot.com

It sounds like a fried furnace control to me. Probably the furnace
and AC are both running at the same time. I'd start by shutting off
the gas to the furnace.

--
The e-mail address in our reply-to line is reversed in an attempt to
minimize spam. Our true address is of the form .

CJT wrote:
The Sanity Inspector wrote:

A lightning strike last night blew out a transformer in our
area. We didn't lose our power, but we must have gotten some kind of
surge damage. I have a gas furnace and an a/c. The fan will not turn
off now, even when I set the fan to "auto" and the thermostat to
"off". I replaced the thermostat, thinking it had gotten fried, but I
still have the same problem. Plus, the furnace is getting very hot to
the touch, even though the chiller is working and cool air is coming
out of the vents. What else could be the matter? Thanks.


--
bruce
The dignified don't even enter in the game.
-- The Jam

http://tinyurl.com/4sarw |
http://www.cafepress.com/notdifficult
http://postingwillbelight.blogspot.com
http://atlantarofters.blogspot.com
http://is-3.blogspot.com


It sounds like a fried furnace control to me. Probably the furnace
and AC are both running at the same time. I'd start by shutting off
the gas to the furnace.

Hi,
Actually, by shutting off the circuit breaker and turning it back on
will reset(master clear)the logic board. Then most likely it'll flash
trouble code if there is something wrong. OP did not mention the model
of his system.

Tony Hwang wrote:

CJT wrote:

The Sanity Inspector wrote:

A lightning strike last night blew out a transformer in our
area. We didn't lose our power, but we must have gotten some kind of
surge damage. I have a gas furnace and an a/c. The fan will not turn
off now, even when I set the fan to "auto" and the thermostat to
"off". I replaced the thermostat, thinking it had gotten fried, but I
still have the same problem. Plus, the furnace is getting very hot to
the touch, even though the chiller is working and cool air is coming
out of the vents. What else could be the matter? Thanks.


--
bruce
The dignified don't even enter in the game.
-- The Jam

http://tinyurl.com/4sarw |
http://www.cafepress.com/notdifficult
http://postingwillbelight.blogspot.com
http://atlantarofters.blogspot.com
http://is-3.blogspot.com



It sounds like a fried furnace control to me. Probably the furnace
and AC are both running at the same time. I'd start by shutting off
the gas to the furnace.

Hi,
Actually, by shutting off the circuit breaker and turning it back on
will reset(master clear)the logic board. Then most likely it'll flash
trouble code if there is something wrong. OP did not mention the model
of his system.

I suppose that's true, if it has a "logic board" with trouble codes.
In my furnace/AC, the control system is a couple of relays,
spaghetti-wired.

--
The e-mail address in our reply-to line is reversed in an attempt to
minimize spam. Our true address is of the form .

CJT wrote:
Tony Hwang wrote:

CJT wrote:

The Sanity Inspector wrote:

A lightning strike last night blew out a transformer in our
area. We didn't lose our power, but we must have gotten some kind of
surge damage. I have a gas furnace and an a/c. The fan will not turn
off now, even when I set the fan to "auto" and the thermostat to
"off". I replaced the thermostat, thinking it had gotten fried, but I
still have the same problem. Plus, the furnace is getting very hot to
the touch, even though the chiller is working and cool air is coming
out of the vents. What else could be the matter? Thanks.


--
bruce
The dignified don't even enter in the game.
-- The Jam

http://tinyurl.com/4sarw |
http://www.cafepress.com/notdifficult
http://postingwillbelight.blogspot.com
http://atlantarofters.blogspot.com
http://is-3.blogspot.com




It sounds like a fried furnace control to me. Probably the furnace
and AC are both running at the same time. I'd start by shutting off
the gas to the furnace.

Hi,
Actually, by shutting off the circuit breaker and turning it back on
will reset(master clear)the logic board. Then most likely it'll flash
trouble code if there is something wrong. OP did not mention the model
of his system.


I suppose that's true, if it has a "logic board" with trouble codes.
In my furnace/AC, the control system is a couple of relays,
spaghetti-wired.

Hmm,
Then it's easier to fix compared to digital board. Digital board can be
fied as long as micro processor and ASIC are OK.

Thanks for the responses so far. I should mention that
resetting the breakers did not fix the problem either. I'm having to
turn the fan off with the breaker switch, in fact.

I called Home Depot, and the guy in the electric department
tried to walk me through a trouble-shooting checklist involving the
24-volt transformer and relay. But, I don't own the necessary gauges,
so I'll probably have to call someone. Know what you're stupid at, I
always say.


--
bruce
The dignified don't even enter in the game.
-- The Jam

http://tinyurl.com/4sarw | http://www.cafepress.com/notdifficult
http://postingwillbelight.blogspot.com
http://atlantarofters.blogspot.com
http://is-3.blogspot.com

On Mon, 26 Jun 2006 00:59:35 GMT, CJT wrote:

Tony Hwang wrote:

CJT wrote:

The Sanity Inspector wrote:

A lightning strike last night blew out a transformer in our
area. We didn't lose our power, but we must have gotten some kind of
surge damage. I have a gas furnace and an a/c. The fan will not turn
off now, even when I set the fan to "auto" and the thermostat to
"off". I replaced the thermostat, thinking it had gotten fried, but I
still have the same problem. Plus, the furnace is getting very hot to
the touch, even though the chiller is working and cool air is coming
out of the vents. What else could be the matter? Thanks.


--
bruce
The dignified don't even enter in the game.
-- The Jam

http://tinyurl.com/4sarw |
http://www.cafepress.com/notdifficult
http://postingwillbelight.blogspot.com
http://atlantarofters.blogspot.com
http://is-3.blogspot.com



It sounds like a fried furnace control to me. Probably the furnace
and AC are both running at the same time. I'd start by shutting off
the gas to the furnace.

Hi,
Actually, by shutting off the circuit breaker and turning it back on
will reset(master clear)the logic board. Then most likely it'll flash
trouble code if there is something wrong. OP did not mention the model
of his system.

I suppose that's true, if it has a "logic board" with trouble codes.
In my furnace/AC, the control system is a couple of relays,
spaghetti-wired.

Regardless, I think you are right about shutting off the gas, because
if the control sytem is fried, do you think we can count on it to turn
off the furnace or the gas when it should?

It's not cold out. He can wait a while to turn the gas back on, if
everything else is working.

mm wrote:
On Mon, 26 Jun 2006 00:59:35 GMT, CJT wrote:


Tony Hwang wrote:


CJT wrote:


The Sanity Inspector wrote:


A lightning strike last night blew out a transformer in our
area. We didn't lose our power, but we must have gotten some kind of
surge damage. I have a gas furnace and an a/c. The fan will not turn
off now, even when I set the fan to "auto" and the thermostat to
"off". I replaced the thermostat, thinking it had gotten fried, but I
still have the same problem. Plus, the furnace is getting very hot to
the touch, even though the chiller is working and cool air is coming
out of the vents. What else could be the matter? Thanks.


--
bruce
The dignified don't even enter in the game.
-- The Jam

http://tinyurl.com/4sarw |
http://www.cafepress.com/notdifficult
http://postingwillbelight.blogspot.com
http://atlantarofters.blogspot.com
http://is-3.blogspot.com



It sounds like a fried furnace control to me. Probably the furnace
and AC are both running at the same time. I'd start by shutting off
the gas to the furnace.


Hi,
Actually, by shutting off the circuit breaker and turning it back on
will reset(master clear)the logic board. Then most likely it'll flash
trouble code if there is something wrong. OP did not mention the model
of his system.

I suppose that's true, if it has a "logic board" with trouble codes.
In my furnace/AC, the control system is a couple of relays,
spaghetti-wired.


Regardless, I think you are right about shutting off the gas, because
if the control sytem is fried, do you think we can count on it to turn
off the furnace or the gas when it should?

It's not cold out. He can wait a while to turn the gas back on, if
everything else is working.
Hi,
For ultimate safety, yes. But this logic board is not that dumb. The
logic has a fail-safe feature. Micro processor is programmed that way.

"Tony Hwang" wrote

For ultimate safety, yes. But this logic board is not that dumb. The
logic has a fail-safe feature. Micro processor is programmed that way.

And I'll bet you call yourself a technician (or better yet, an engineer)!!

Let's put you out in the next thunderstorm and see how good your "logic
board", "fail safe" and "micro-processor" functions after you are struck by
lightning !!!

On Tue, 27 Jun 2006 20:22:46 GMT, "Ken Abrams"
wrote:


Let's put you out in the next thunderstorm and see how good your "logic
board", "fail safe" and "micro-processor" functions after you are struck by
lightning !!!

I don't want to belabor this, but I remember that after I found the
keypad/control panel of my burglar alarm smoking, I replaced it with a
used one that my friend the alarm installer gave me (that he had
removed when he put in his brand of alarm somewhere). It's a fancy
thing with 2 IC's, and a lot of other parts, and lots of programmable
options, It worked fine, except every two weeks or so (counting only
times that I was home) it set off the siren even though the alarm
wasn't even armed, and no one opened a door. (Should have
disconnected it after the first or second time, but I waited until
after the third.)