I've created some other posts, and gone back and forth. I thought that I fixed my problem, but I haven't. At least I now know what the REAL problem is. Here goes. I have an M1SB 066 oil-fired, forced-air furnace. The ignitor (transformer) keeps going out. I've replaced it once, and am going to do it...

Thanks. I think you are right. After more research, I think it is normal heat dissipation.

I have an oil-fired, forced-air, Nordyne M1SB 066 furnace. After the call for heat ends, the fan keeps running until it drops below 95 degrees in the furnace. This is to be expected. However, after a couple seconds, the fan kicks on again for a while and stops. And sometimes it will start again a se...

Thanks for all of the responses. I replaced the transformer (ignitor), and the issues seems to have gone away. I finally caught a dirty start in action, and indeed there was no flame. I also purchased the Genisys 7505b1500 and the digital display/programmer. I know that my primary control (r7184b) i...

This unit has an R1784B1024 primary control. I have been reading online that my problem is not unique. A lot of people are having this lockout issue with this primary. Read for example here: http://www.heatinghelp.com/forum-thread/96984/R7184-Intermittent-Problem Are there other primary control unit...

Thanks for the reply Robert. I've been doing some more reading, and some manuals say this is a common problem with these types of oil-fired furnaces. One manual said something like "randomly, for no apparent reason, the flame may not ignite." So I guess that makes me feel better? Anyway, I...

I have a Nordyne M1SB 066 furnace. It is an oil-fired, forced-air system. The thermostat calls for heat, oil starts being pumped it, and the furnace tries to ignite the fire after 15 seconds. Oftentimes a flame doesn't start, which causes the furnace to go into lock out. I thought for a while that t...