[weeple2000]

Came back from a weekend away, and the furnace was out. The house was 59 degrees, down from the 65 it would have been normally.

The first thing I tried was flipping the circuit breaker, the furnace came back on for a little bit, then turned off. I believe I tried this a second time, and it turned on and off quickly.

I tried to search online for possible solutions. They suggested checking for exposed wire or lose connections. I turned off the breaker for the furnace and opened it. The stuff on top seemed good, but on the bottom inside the blower compartment there was a screw loose with a wire underneath it that may have lost its connection. I screwed it tight.

I haven't been able to cycle the furnace since however.

Any suggestions?

 

[Bondo]

Ayuh,.... What sorta furnace,..?? Brand,..?? Model,..?? Gas,..?? Oil,..??

 

[weeple2000]

armstrong air, it's gas

 

[user_12345a]

a lot of modern furnaces flash an error code on the board, check for a sight glass in the blower access panel. it could tell you what's going on.

Assuming it's 90%+, venting with plastic pipes, check the condensate drain line and trap inside the unit.

check the filter, could be cycling on limit, possibly locking out.

dirty flame sensor could do it too,

 

[roughneck]

Check for an error code. Make sure the air filter is clean and all supply/return registers are open and unblocked. Do you have the model number? Natural or LP? Gas pressure?

 

[weeple2000]

The bottom door lists the following which I believe is a model number: a95uh1d070b12a-03

 

[weeple2000]

a lot of modern furnaces flash an error code on the board, check for a sight glass in the blower access panel. it could tell you what's going on.

Assuming it's 90%+, venting with plastic pipes, check the condensate drain line and trap inside the unit.

check the filter, could be cycling on limit, possibly locking out.

dirty flame sensor could do it too,

There is a sight glass, but its on the top panel. The bottom section has the board but no sight glass.

 

[ben's plumbing]

remove both doors top and bottom....use duct tape to hold the safety switch in and cycle furnace...see what code come up...

 

[user_12345a]

not familiar with these furnaces - if you remove the blower access panel, is there another access panel or do u get into the blower compartment.

Check the board for an led, check the schematic for error code info. issue is that removing the access panel cuts power to the unit, clears the code.

 

[weeple2000]

remove both doors top and bottom....use duct tape to hold the safety switch in and cycle furnace...see what code come up...

Can someone else comment as to whether or not I should do this? I found what I believe is a red led on the panel in the bottom compartment. I am not sure if I should be able to see it light up through the sight glass in the top compartment.

Any thoughts?

 

[user_12345a]

You can safely do it if you have combustion air coming from outside, two pipe install.

better furnaces have the burners enclosed in a box, if not you'll have to hold the top panel on or something.

the blower running with non-sealed combustion can draw exhaust into the room. direct air from outside solves that issue.

 

[weeple2000]

a lot of modern furnaces flash an error code on the board, check for a sight glass in the blower access panel. it could tell you what's going on.

Assuming it's 90%+, venting with plastic pipes, check the condensate drain line and trap inside the unit.

check the filter, could be cycling on limit, possibly locking out.

dirty flame sensor could do it too,

Here are a couple pics. What would the issue with the condensate line be, that the trap dried out?

https://drive.google.com/file/d/0BwMflD3qIuubLVprdURnSXZGWlZ6ZW5LWW05c0NUWGNHTV9F/view?usp=sharing

https://drive.google.com/file/d/0BwMflD3qIuubLTNjOHdCTGNEcnoyT1RyWGlfaTZKY3oyNl9J/view?usp=sharing

 

[weeple2000]

a lot of modern furnaces flash an error code on the board, check for a sight glass in the blower access panel. it could tell you what's going on.

Assuming it's 90%+, venting with plastic pipes, check the condensate drain line and trap inside the unit.

check the filter, could be cycling on limit, possibly locking out.

dirty flame sensor could do it too,

Would the flame sensor prevent it from coming on at all?

 

[roughneck]

No it wouldn't

 

[weeple2000]

I taped the switch for the bottom panel and flipped the circuit breaker on, the led did not light up at all.

Any suggestions?

 

[user_12345a]

...it can if it fails to detect the flame a few times and locks out.

it's two-pipe.

A very good option is to tape the blower door switch closed, run the furnace until it conks out and remove the blower access panel without cutting the power.

you'll get the error code that way.

 

[weeple2000]

I taped the switch for the bottom panel and flipped the circuit breaker on, the led did not light up at all.

Any suggestions?

I also set the thermostat fan setting from "auto" to "on" so that it would run regardless. I taped the switch on the bottom panel, turned on the switch for the furnace, and flipped the circuit breaker. I expected the fan to be running, but it was not.

Can I test the power to the furnace with a multimeter?

Could the issue be my thermostat?

 

[weeple2000]

...it can if it fails to detect the flame a few times and locks out.

it's two-pipe.

A very good option is to tape the blower door switch closed, run the furnace until it conks out and remove the blower access panel without cutting the power.

you'll get the error code that way.

The furnace isn't coming on at all when I am turning it on. I will try cleaning the flame sensor.

 

[roughneck]

Is there power to the furnace? How about if you jump the thermostat out, does it run then?

 

[roughneck]

If your bringing it on after cycling power, it's not the flame sensor.