I have a Concord 90 high eficiency furnace, the aircondition works fine, but the heat won't work, the green light is flashing, the flame comes on for a few seconds then shuts off, my house is freezing, can someone help and advise how I can fix this? the filter is new.:mad: :confused:

https://www.askmehelpdesk.com/heating-air-conditioning/heating-cooling-maintenance-repair-troubleshooting-frequently-asked-questions-58313.html


Gas forced air.

1. Sequence of operation.
2. Blower turns on but there is no heat.
3. What is a flame sensor?
4. What is a pressure switch?
5. Where is the diagnostic light?
6. What is a transformer?
7. What is a main limit?
8. What is a roll out limit?
9. What is a spill switch?

The flashing light is giving you a code, from no light as a start,count the blinks, example,1 blink a very short pause and them 3 more quick blinks is a code 13,, look on door,inside or maybe outside you should find a glued on paper with a list of codes and what the code means, let us know

Found the problem, after a lot of research, it came down to cleaning the flame sensor, it now works great, thanks for all you help