2006-09-21 03:59:57 · 7 answers · asked by concerned about cats 1 in Home & Garden ➔ Maintenance & Repairs
it is gas and i have tried lowering the thermostat and that still is not helping.
2006-09-21 04:10:02 · update #1
There is a thermocouple that checks for the pilot light coming on (assuming this is an electronic ignition system). Unless the thermocouple detects pilot ignition, it won't allow the main gas feed to open. The blowers will run for a short while, but the furnace won't ignite. If, when you turn on the furnace, you can see the pilot light ignite and the furnace still does not start, then the thermocouple is shot. Fortunately, it's not too expensive to replace.
2006-09-21 05:59:05 · answer #1 · answered by hoperd2000 2 · 0⤊ 0⤋
my guess: the room temperature is just below the temperature your thermostat is set at. so, the furnace kicks in, blows some heat, the thermostat thinks the room temp has been achieved, and shuts the furnace off.
try lowering the thermostat by 5 or 10 degrees. if it keeps happening, something else is going on.
2006-09-21 04:06:39 · answer #2 · answered by lurk02productions 2 · 0⤊ 0⤋
It maybe cycling on the high limit. That is a sensor in your furnace. You did not mention if the furnace lights though. If it does not light it will also shut down.
2006-09-21 04:31:44 · answer #3 · answered by Thomas S 6 · 0⤊ 0⤋
I don't have enough information to make a true diagnosis but it would seem the the system is not lighting, assuming it is oil or gas fired. Even if it is electric fired it seems that you have a safety that is shutting it down because it is not doing something it should during the lighting process.
2006-09-21 04:06:29 · answer #4 · answered by Letsee 4 · 0⤊ 0⤋
If your furnace is a 90plus that draws its combustion air from outside, also check to make sure the air inlet (usually protrudes from outside the house in the foundation area) is not blocked or clogged by plants or nests etc. It's an easy check before you contact a pro.
2006-09-21 04:50:44 · answer #5 · answered by Paul W 1 · 0⤊ 0⤋
Sounds to me that it may be going into high limit shut off.
Is the fan running? If not, call a tech.
If the fan is running, check the filters - if they are extremely dirty, you may not be removing enough heat from the heat exchanger - i.e. high limit shut off.
good luck
2006-09-21 06:11:23 · answer #6 · answered by Chris L 2 · 0⤊ 0⤋
My gas furnance was doing the same thing and it was the relay switch.
2006-09-21 04:14:16 · answer #7 · answered by Carolina Blue 1 · 0⤊ 0⤋