Richardson Posted October 5, 2015 Report Share Posted October 5, 2015 I have a Trane XR95 natural gas up flow furnace, 60,000BTU. In the last couple of days the primary blower starts up when the thermostat calls for heat, but shuts down after running only about 5 seconds, before the burners kick in. I have read all of the posts and haven't seen this particular problem. Quote Link to comment Share on other sites More sharing options...
Marc Posted October 5, 2015 Report Share Posted October 5, 2015 Did the burners actually flame up with the blower still off? Marc Quote Link to comment Share on other sites More sharing options...
Marc Posted October 5, 2015 Report Share Posted October 5, 2015 Your issue might be a result of air in gas line or it could be the control card. The card is expensive and can't be returned once you buy it so try bleeding the gas line first. Update us when you've bled the line. Marc Quote Link to comment Share on other sites More sharing options...
Nolan Kienitz Posted October 5, 2015 Report Share Posted October 5, 2015 You have double-posted this request. As I replied there maybe try putting new batteries in the T-stat first. That is the simplest approach ... then go from there. Quote Link to comment Share on other sites More sharing options...
Brandon Whitmore Posted October 6, 2015 Report Share Posted October 6, 2015 I have a Trane XR95 natural gas up flow furnace, 60,000BTU. In the last couple of days the primary blower starts up when the thermostat calls for heat, but shuts down after running only about 5 seconds, before the burners kick in. The first thing I do when diagnosing issues with a furnace is to remove the thermostat from the equation. Your furnace will have fault codes (flashing lights) that may point you in the right direction.... Quote Link to comment Share on other sites More sharing options...
Ben H Posted October 6, 2015 Report Share Posted October 6, 2015 Does the igniter glow at all? Quote Link to comment Share on other sites More sharing options...
plummen Posted October 9, 2015 Report Share Posted October 9, 2015 Does the igniter glow at all? [:-thumbu][:-thumbu][:-thumbu][:-thumbu][:-thumbu] Your inducer motor comes on 1st followed by the hot surface igniter before gas valve opens. Pull the hose from the inducer motor housing and try sucking on the end of hose to see if pressure switch is closing. If the pressure switch is closing hook it back up and check igniter. Be carefull pulling the igniter out,Look for a white line going across it. Thats usually a sign its cracked,unless you can see a giant chunk missing from it. Quote Link to comment Share on other sites More sharing options...
mlparham Posted October 9, 2015 Report Share Posted October 9, 2015 I have a Trane XR95 natural gas up flow furnace, 60,000BTU. In the last couple of days the primary blower starts up when the thermostat calls for heat, but shuts down after running only about 5 seconds, before the burners kick in. I have read all of the posts and haven't seen this particular problem. Try the 30 second solution. Write a check to a HVAC company. Quote Link to comment Share on other sites More sharing options...
micgreggor Posted January 13, 2016 Report Share Posted January 13, 2016 I had the same problem. Clean the temperature sensor located at the top of the burner. Oxidation prevents the senor from heating up enough before it times out. Quote Link to comment Share on other sites More sharing options...
Brandon Whitmore Posted January 14, 2016 Report Share Posted January 14, 2016 I had the same problem. Clean the temperature sensor located at the top of the burner. Oxidation prevents the senor from heating up enough before it times out. While I see why one would think it's a temp. sensor, it isn't. It's a flame rod-- google flame rectification if curious. Quote Link to comment Share on other sites More sharing options...
plummen Posted February 22, 2016 Report Share Posted February 22, 2016 I had the same problem. Clean the temperature sensor located at the top of the burner. Oxidation prevents the senor from heating up enough before it times out. While I see why one would think it's a temp. sensor, it isn't. It's a flame rod-- google flame rectification if curious. The flame sensor doesnt come into play until after the burners light,It doesnt sound like the burners every light. Quote Link to comment Share on other sites More sharing options...
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