The 2 flashes on the screen and the furnace will not turn on. The 2 indicates the time frame program which is correct but why flashing? Owners manual does not address.
I had two flashes on a Honeywell 8670 continuous retry controller to my Burnham power vent natural gas furnace.In my furnace the two flashes meant the last attempt at starting failed and it was going to retry in 90 seconds.
In my case the furnace actually had two intermittent problems with similar codes. The first issue was the high voltage pilot light cable was also a combination flame sensor wire. The cable was supposed to clamp on to the pilot assembly like a spark plug wire.
When it was installed the clamping bits were too far apart and some fool decided since it wasn't sticking he would glue it on. This worked initially, but later the connection was only good enough to pass the high voltage not the low current DC signal back to the controller indicating the flame started successfully. Flames conduct a small amount of electricity due to ionization and the controller senses this.
I pinched the clamping bits together with some pliers. Then it fit tight and kept working.
Other reasons for the 2 flash code on my controller might be no gas or pilot light failure.
My other problem was a partially failed capacitor on my power vent motor caused the vent fan to run in reverse on say one in one hundred start attempts. Once it started running in reverse it wouldn't run forward without stopping it completely, which took several minutes of off time. The capacitor was available quickly and inexpensively from McMaster Carr.
Jan 10, 2015 |
Heating & Cooling