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I have a Bryant CAV395024070 furnace thats taking a code 31.

Sent to HVAC Experts December 29 2008 at 9:19 PM
   

I have a Bryant CAV395024070 furnace thats taking a code 31. When I run a component test, the inducer motor comes on, sometimes for only a second, sometimes for the proper amount of time, sometimes not at all. The remainder of the components all go through the test no matter what the inducer motor does. When I turn the thermostat on, sometimes the furnace runs, other times only the blower motor comes on and will run until I either turn the thermostat off or lower the set temperature so that the thermostat is satisfied. If I get the furnace to run and it satisfies the thermostat and shuts down, it may come back on as normal the next time the thermostat calls for heat. Other times the inducer motor will start then stop before the igniter glows and you can hear a noise coming from the control board. When this happens I reset the manual reset limit switch (flame rollout switch) and the noise goes away and the furnace will then run as normal. Is the problem with a relay on the ctl. board?

Customer (name blocked for privacy)
Status:  Closed   Value:  $9
Answer
December 29 2008 at 11:24 PM (2 hours and 4 minutes and 52 seconds later)
         
hi. what does the sticker on the furnace say code 31 is
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coolman1973 -- Hvac tech and Mechanic -- 96% Positive Feedback on 334 HVAC Accepts
15 yrs field exp/5yrs supervisingexp/ Nate and Epa cert.
Reply
December 30 2008 at 12:09 AM (44 minutes and 35 seconds later)
         
For code 31 it is....Pressure, Draft Safeguard, or Auxiliary limit (when used) switch did not close or reopened. If open longer than 5 minutes, inducer shuts off for 15 minutes before retry. Check for: ***Proper vent sizing and condensate pitch ***Vent restriction or high winds ***Defective inducer motor or start capacitor ***Defective pressure switch or connections. If it opens after trial for ignition period, blower will come on for 90 second recycle delay. ***Inadequate combustion air supply ***Low inducer voltage ***Disconnected or obstructed pressure tubing The pressure switch has been replaced, I have checked the venting and condensate pitch. It is a new filter and has adequate combustion air supply.           
Customer (name blocked for privacy)
Answer
December 30 2008 at 12:12 AM (3 minutes and 15 seconds later)
         
ok shut the power off and on to reset the board, then restart the furnace and tell me step by step what happens thanks
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coolman1973 -- Hvac tech and Mechanic -- 96% Positive Feedback on 334 HVAC Accepts
15 yrs field exp/5yrs supervisingexp/ Nate and Epa cert.
Reply
December 30 2008 at 12:23 AM (10 minutes and 43 seconds later)
         
The led went solid, The inducer motor started and ran for about 15-20 seconds then shut down. Now I have a code 31 and the control board is making a sound intermittently. Now the blower came on.

Edited by XXXXXXXXXX on December 30 2008 at 12:25 AM
Customer (name blocked for privacy)
Answer
December 30 2008 at 12:26 AM (3 minutes and 30 seconds later)
         
ok try this for me, take the hose of the inducer motor that goes to the pressure switch, blow and suck on the hose put it back on and restart the furnace.
Picture
coolman1973 -- Hvac tech and Mechanic -- 96% Positive Feedback on 334 HVAC Accepts
15 yrs field exp/5yrs supervisingexp/ Nate and Epa cert.
Reply
December 30 2008 at 12:40 AM (13 minutes and 5 seconds later)
         
<p>Same result.</p>
Customer (name blocked for privacy)
Answer
December 30 2008 at 12:47 AM (7 minutes and 56 seconds later)
         

sounds like u have a bad relay in ur control board, if u can find a ac/heat parts house that sells rheem units u should be able to get one for maybe 100 bucks or so. and if its less than 5 yrs old ur parts are still under warranty

Picture
coolman1973 -- Hvac tech and Mechanic -- 96% Positive Feedback on 334 HVAC Accepts
15 yrs field exp/5yrs supervisingexp/ Nate and Epa cert.
Reply
December 30 2008 at 12:56 AM (8 minutes and 49 seconds later)
         
That is the conclusion that I came to, but I don't know anything about heating and cooking other than what I have learned trying to resolve this issue. I have a technician coming out later this week but if I know it is the control board I can change that out myself and probably save at least $100 or more. I found the control board online for $280. Do you think it should be available cheaper?
Customer (name blocked for privacy)
Answer
December 30 2008 at 12:58 AM (1 minute and 34 seconds later)
         
what yr is the furnace,
Picture
coolman1973 -- Hvac tech and Mechanic -- 96% Positive Feedback on 334 HVAC Accepts
15 yrs field exp/5yrs supervisingexp/ Nate and Epa cert.
Reply
December 30 2008 at 12:59 AM (1 minute and 34 seconds later)
         
November 1995
Customer (name blocked for privacy)
Answer
December 30 2008 at 1:04 AM (4 minutes and 21 seconds later)
         
ACCEPTEDCheck Mark

ya that 90% furnace board is a little more money , u could prob get it cheaper if u were a contractor but 280 is better than 600 for someone to come out and do it

Picture
coolman1973 -- Hvac tech and Mechanic -- 96% Positive Feedback on 334 HVAC Accepts
15 yrs field exp/5yrs supervisingexp/ Nate and Epa cert.
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