COMMUNITY FORUM

Zimmie

11:18AM | 01/14/05
Member Since: 01/13/05
1 lifetime posts
Bvhvac
Miller CMF 80 gas furnace. With PGB-DI Direct Ignition. I have a problem with burner igniting. It will lite for about 10 or 15 seconds then will go out. This happens 3 or 4 times and may start and work fine. Other times it won't ignite at all and I hear a motor running with no flame in fire box. I also at times have to turn down the thermostat and reset it to 70 for the furnace to come on. ( it has a new thermostat ). As I write this the furnace is working fine, but may not come on the next time I need heat ???? Thanks for any help. Zimmie

JGRIZZ

07:50PM | 01/14/05
Member Since: 12/16/04
54 lifetime posts
All electronic igition systems have flame rectification, or a means of proving there is a flame present in order to keep the main gas valve open.

There are various means of flame rectification, if you have a flame sensor the flame sensor is a rod with one wire that goes to it and it is usually mounted on the burner box that holds the burners.The other type of rectification method is made through the hot surface ignitor such as one an older rheem unit. I would guess you have a flame senor rod.

There will be one white wire connected

to the top of the flame sensor and the wire will go from there all the way back to the ignition control.

There will also be two white wires connected to a plug-opposite the flame sensor, these two should lead back to the hot surface ignitor. Dont touch the hot surface ignitor!!It will break from the oils on your hand. THe flame sensor only has one wire on it and the opposite end of it sticks into the flames from the burner outlet. What happens is that the igniton control sends a signal from its ground lug through the furnace cabinet ground, and the signal travels from the burners across the flames to the sensor and back to the ignition control.

A few things can cause what youre talking about. A bad, or loose or dirty ground. No ground at all. Improper polarity, a bad or dirty flame sensor. A bad ignition control or even a bad sensor wire. Usually the ignition control will look for a signal from the flame sensor and if it does not recieve it in about 2-5 seconds it will shut down the unit and it will try a few more times to ignite.

Another possibility is that the gas pressure is too low, and another could be that the burners are not lined up properly.

I would suspect a bad flame senor first and would attempt to clean it or replace it first. Other than that you will probably need someone outhere who can diagnose a flame rectification problem.
Click_to_reply_button
Inspiration_banner

INSPIRATION GALLERY



Post a reply as Anonymous

Photo must be in JPG, GIF or PNG format and less than 5MB.

Reply_choose_button

Anonymous

Post_new_button or Login_button
Register

If you have a spare desk sitting around, you can easily convert it into a custom vanity. Cut away the back portion of the ... Filling an underutilized area beneath the stairs is a smart way to save space. Doing so with a stash of wood, however, is ... The Audubon Society inspired wallpaper in this Adirondack-styled entryway will get you in the outdoor mood. Grab your coat... Chalkboard paint opens up endless possibilities for customizing your dresser time and time again. Use chalk to label the c... A fireplace in the bathroom creates the ultimate setting for relaxation. Homeowners often choose electric or gas over wood... Yes, a freestanding garage can become its own tiny house. Artist Michelle de la Vega has all the comforts of a modern resi... There’s nothing like a new set of cabinet hardware to refresh a room. The possibilities are endless: Go modern, rustic, or... A kitchen in a greenhouse—who wouldn't enjoy spending time in this light-filled space? Details that enhance the conservato... Chalkboard paint features prominently in this elegant yet unpretentious headboard design. Add a new message daily to reflec... Twine lanterns add pops of crafty—but sophisticated—flair to any outdoor setting. Wrap glue-soaked twine around a balloon ... The indecisive homeowner need not fret over choosing one (or even two) cabinet colors. The kitchen cabinets in this artist... Incorporate nature into your lighting scheme by securing a dead tree in a concrete mold and draping your pendant lamp from... Simple and striking, a couple of pieces of "lovingly used" furniture creates a special kind of charm. A weathered chair fo... The Infinite Artisan Fire Bowl from Eldorado Outdoor is made from glass-fiber reinforced concrete, and offered in Oak Barr... The vibrant green of Granny Smith apples make a beautifully natural alternative to the traditional evergreen wreath. Brigh...
Follow_banner_a
Newsletter_icon Google_plus Facebook Twitter Pinterest Youtube Rss_icon
 
webapp2