Hi I have a furnace which has been working fine so far. It is an old one but I can say it is solid. Anyway, 2 days ago I felt the air is not that hot. I put my hand and I felt it is cold or warm air not hot like before. I checke d the thermostat and the Filter indicator was flashing. So I changed the fi lter and then went to thermostat and Press Filter for 3 second as per the m anual.
Now what is happening, the furnace works ok, the air hot but then after rea ching the temp I set, the air turn warm to cold. I checked and I see only p ilot flame is on, the other flames are not. I checked the thermostat and th e number below the Filter indicator is flashing 3 (by the way the thermosta t manual is here
page 6 (top right corner) - you will see the Flash indicator and there is a number below it (in the pic the number is 2). Mine the number is flashing
- Could that be the problem? How can I fix that? Thank you so much.