Gas Heating Lockout Code 21 On Bryant 383 LAV - HVAC - DIY Chatroom Home Improvement Forum


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 11-11-2012, 01:09 PM   #1
Newbie
 
Join Date: Nov 2012
Posts: 4
Rewards Points: 10
Default

Gas Heating Lockout Code 21 on Bryant 383 LAV


I have a Day and Night or Bryant 383LAV Upflow furnace AC combo. This is electronic ignition with natural gas. The AC has worked nicely all summer, but now that winter has come the furnace will not perform. When started the blower motor runs for about a minute, then the gas tries to light, then the unit shuts down displaying the 21 code which means gas heating lockout. Manual says to check for a stuck gas valve relay on control or a miswire or short to the gas valve wire. I had to replace the door switch on this furnace last year. I cleaned the flame sensor. Still no luck. The unit is probably original to the house 1991...Any advice would be appreciated.

Advertisement


Last edited by stanmerrell; 11-11-2012 at 01:14 PM.
stanmerrell is offline   Reply With Quote
Old 11-11-2012, 01:17 PM   #2
Hvac Pro
 
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 10,082
Rewards Points: 802
Default

Gas Heating Lockout Code 21 on Bryant 383 LAV


Does the igniter glow red hot? If not it may be burnt out.

Advertisement

__________________
"Cut it twice and it is still too short".
yuri is online now   Reply With Quote
Old 11-11-2012, 01:46 PM   #3
Newbie
 
Join Date: Nov 2012
Posts: 4
Rewards Points: 10
Default

Gas Heating Lockout Code 21 on Bryant 383 LAV


Hi Yuri,
Yes the igniter glows red hot. Not getting any gas though. Thank you!
stanmerrell is offline   Reply With Quote
Old 11-11-2012, 02:13 PM   #4
Hvac Pro
 
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 10,082
Rewards Points: 802
Default

Gas Heating Lockout Code 21 on Bryant 383 LAV


check to see if you are getting 24 volts AC across the 2 wires on the gas valve NOT to ground. That is a very uncommon code and that furnace is quite old and the circuit boards had failures from poor solder joints so it sounds like it may be a bad circuit board.
__________________
"Cut it twice and it is still too short".
yuri is online now   Reply With Quote
Old 11-11-2012, 03:09 PM   #5
Newbie
 
Join Date: Nov 2012
Posts: 4
Rewards Points: 10
Default

Gas Heating Lockout Code 21 on Bryant 383 LAV


Thanks Yuri,
I'm getting 24 volts across the two wires shown on top of the gas valve. The current does not stop or start when the furnace is cycling. It is always present to the valve. One of the wires is green and seems to connect to ground. The other is dark blue.
http://s222.beta.photobucket.com/use..._0467.jpg.html
Thank you.
stanmerrell is offline   Reply With Quote
Old 11-11-2012, 03:21 PM   #6
Hvac Pro
 
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 10,082
Rewards Points: 802
Default

Gas Heating Lockout Code 21 on Bryant 383 LAV


After it locks out and gives you the code it must not have voltage at the valve. If it does then the relay is stuck ON at the board and the code is correct and you need a new board. The board does a self check B4 starting its cycle and if that relay is stuck then it locks out. At 21 yrs old those units have problems with cracked heat exchangers and I would not invest $$ in repairs. Ventor fan and pressure switch and valve will fail soon.
__________________
"Cut it twice and it is still too short".
yuri is online now   Reply With Quote
Old 11-11-2012, 03:49 PM   #7
Newbie
 
Join Date: Nov 2012
Posts: 4
Rewards Points: 10
Default

Gas Heating Lockout Code 21 on Bryant 383 LAV


Okay. Thanks Yuri. I'm going to call for a replacement quote. Thanks again for your help with this.
stanmerrell is offline   Reply With Quote
Old 11-11-2012, 03:53 PM   #8
Hvac Pro
 
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 10,082
Rewards Points: 802
Default

Gas Heating Lockout Code 21 on Bryant 383 LAV


Your photo album is wide open for the public to see, you can make pics private on there and I would not be using my name on the internet.

Advertisement

__________________
"Cut it twice and it is still too short".
yuri is online now   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
New construction of second floor, would 2x8' be okay to use instread of 2x12'? wesshe69 Building & Construction 26 05-06-2012 01:14 PM
Bryant Fault Code 31 - Just Changed Air Filter! matimo312 HVAC 12 11-21-2010 11:06 PM
code details for boxes kama Electrical 6 01-30-2009 11:25 AM
Trane XE80 Heating Question, Please help!!! Stephen1977 HVAC 3 01-30-2007 07:34 PM
1950's Roof Framing Strength KempLN Building & Construction 21 06-17-2006 11:06 AM




Top of Page | View New Posts