System is on calling for heat but furnace won`t come on.When it does eventually come on it cuts out before the programmed thermostat temps. When this happens 1 of the 2 green furnace lights blinks once repeatedly.This seems to occur when it is really cold outside. At other times the furnace works fine.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
You can easily blow through the drain with pressurized air through the p trap. There could be a number of reasons the furnace side is not working. In the case of windy conditions there is a possibility that your pilot will need to be adjusted or the flame sensing rod might need to be cleaned. If the pilot wavers off of the sensing rod it could cut off the heating cycle because the system could not verify a flame yo bring on the main gas valve to continue with the cycle
I would try to check your return air first, making sure there is no blockage and that your air filters are clean. It almost sounds like when you take the cover off, you are pulling enough air into the system for it to run, but as soon as you close it off, it's not getting enough air flow, therefore, tripping a limit switch inside the furnace. Most furnaces will also have the codes for the flashing lights and what they mean on the inside of the door covers.
Look on the condensor, (outdoor unit) at the very bottom of the rear panel and you should find a red reset button. push it. If that does not solve the problem, and the outdoor unit is running (make sure both the fan AND the compressor are running) then you are looking at a low refridgerant issue and possibly dirty coils.
In that case, clean the coils and have refridgerant added.
does the furnace ignite?? your system may not have been lighting and has gone into ignition lockout count the codes of the led lights then remove panel led diagnostic codes are listed there.
if led codes indicate no problem verify capacitor is good and that mtr is getting 115 volts.
4 blinks is "pressure switch closed" there are 2 in the system according to the wiring diagram one for the vent system and one for the drain system ... I just wiggled them and heard one "click" the fault light quit blinking and when I pushed the safety switch back in the furnace fired right up. That being said is there a good website for learning how to maintain your own furnace? I'll call a pro if I have to, but shoot I can fix a jet engine... this shouldn't be much worse.