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So I guess I will update this post. I google around and found out a quick and simple remedy is just to clean up the thermocouple coz it seems to be a trouble source for a lot of similar problem. So I took it out, light sanded it and used some rubbing alcohol to clean it. Also I found the limit sensor and cleaned it up and secured the connection, and now the furnace is working fine.
So I guess I will update this post. I google around and found out a quick and simple remedy is just to clean up the thermocouple coz it seems to be a trouble source for a lot of similar problem. So I took it out, light sanded it and used some rubbing alcohol to clean it. Also I found the limit sensor and cleaned it up and secured the connection, and now the furnace is working fine.
Rarely does that "fix" last a season- so be prepared to replace. Probably on the day that it's friggin' cold as Hell and you're shivering, making it hard to hold a wrench.
call your gas company to check it out,it may be the thermo. and or a vent limit, let the pro check it out,you don't want co in your house it can kill you. just an old gas man.
call your gas company to check it out,it may be the thermo. and or a vent limit, let the pro check it out,you don't want co in your house it can kill you. just an old gas man.
Is it the same as calling an hvac contractor? Or the gas company would do it cheaper or free? Unfortunately the fix failed today after a few days of no heat pump usage. The pilot fire went out again. Guess I will buy a thermo first. From the picture I had above, it's a Honeywell unit. Would the one lowes have for Honeywell work? Lowes only have three types of thermocouple for Honeywell, just differ by length of copper wire.
My plan is to start with simplest fix, getting a new thermocouple. But can you guys tell me what exactly should the safety limit be setting at. Last time when problem occurred, I did a few experiment with this limit (shown in the picture), it seems just like two connection poles, I can unplug one side of the ring and the fan would start to rotate. I tried to clean the connections and secure it. But I could not find a reference to say what the normal status is or what it's supposed to be set at. Now it's activated again shutting the gas out, so I only have fan blowing, pilot running but no main fire. I'll get a new thermocouple after work, but I'm not sure how I should adjust this limit if the new thermocouple would not help ignite the main fire.
Last edited by Niubee43V3R; 11-05-2013 at 07:23 AM..
My plan is to start with simplest fix, getting a new thermocouple. But can you guys tell me what exactly should the vent limit be setting at. Last time when problem occurred, I did a few experiment with this limit (shown in the picture), it seems just like two connection poles, I can unplug one side of the ring and the fan would start to rotate. I tried to clean the connections and secure it. But I could not find a reference to say what the normal status is or what it's supposed to be set at. Now it's activated again shutting the gas out, so I only have fan blowing, pilot running but no main fire. I'll get a new thermocouple after work, but I'm not sure how I should adjust this limit if the new thermocouple would not help ignite the main fire.
It's blocked so I can't get better photo. But it's the small rod right by the side of the pilot fire.
Quote:
Originally Posted by mmyk72
OP. I'm learning from this thread, in case this happens to my furance. Can you post a pic of where the Thermocouple is located?
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