help!! about furnace

[mimizhuzhu2008]

yesterday worked normally

this morning, stop working

turn off the thermometer, adjust the temperature lower than "hold temperature"
after a while, it works , seems normally.


but, half hour later ,when the temperature in house lower than the required temperature, it just start for several seconds, suddenly stop.

what is wrong with it? the furnace or the thermometer? or cirtuit?

 

[Timothy's]

check the filter. replace to new one( don't buy expensive one they are too tight, buy cheap one)
Open the furnace , there is a small tube out of the exhaust pip (black plastic) , go to a 8 cm metal dish like switch. remove it and blow air through. It could be blocked by water.
switch off the break on electric panel to the furnace for 1 min. restart
If there things don't work, call the professionals.

 

[mimizhuzhu2008]

check the filter. replace to new one( don't buy expensive one they are too tight, buy cheap one)
Open the furnace , there is a small tube out of the exhaust pip (black plastic) , go to a 8 cm metal dish like switch. remove it and blow air through. It could be blocked by water.
switch off the break on electric panel to the furnace for 1 min. restart
If there things don't work, call the professionals.

very good . thank you so much.

 

[mimizhuzhu2008]

I switch off the furnace from thermostat.

go to basement,

open the furnace , see inside, full of wires, I knowing nothing about that, so close it right away.

then go upstairs, I switch on the furnace again

it works.

sound weird.

anyway , it works. that is great.