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I just had exactly the same problem, with the same root cause.
I have not fixed it for good. I just pushed with a plastic (just to be safe) stick and it started working... I'll keep looking if it...

Try connecting the blower direct to check if it is working properly. At least you will know for sure if it is good or not.

Have you done what hvac1000 recommends?. The unit should not start doing anything w/o a call. If the symptom stops, then you got the culprit, if not, keep posting with details.

It is strange that...

It's somewhat difficult to say w/o the diagram, but yes there is a way. If it is connected direct but making sure that the connections are right. Also, most of the motors are also activated with a...

It all depends on how much you want to spend on the system. How much energy are you trying to replace with your solar system. There could be options like:
- Only conditioning an specific area at a...

Try this place:
AmericanHVACparts.com

Try this place and just enter the filter's PN:
AmericanHVACparts.com

Try this place, and just enter the filter's PN:
AmericanHVACparts.com

Try this place:
AmericanHVACparts.com

Yes, it could be a faulty switch, a relay or something else.

Main Blower motors can brake, but most likely it is something else that it is causing the blower not to work as it should.

Most of...

Here's a link to a Goodman unit. The draft inducer motor is called vent blower.
http://www.goodmanmfg.com/Portals/0/pdf/CB-GCV9.pdf

To check the draft verify that the motor runs and there are no...

Here's a link of a Lennox unit. I hope it is close to what you have. The draft inducer it is called in your diagram as motor combustion blower.

In the picture of the link is on the top with a...

In case you are still trying to figure this one out... try this:

Make sure the unit is off and no call for heat.
With your hand spin the draft inducer. You MUST hear NOTHING. If you do, there is...

I missunderstood the original comment. Yes, I agree that most likely a gate was not properly closed on the swamp unit.

It does not sound to me that it is a gate issue, though it is very unlikely that both units are now working properly. However, in these systems the duct systems are "shared" by both units (swamp...

Thanks for the information. As you explained the whole situation, first of all, I would NOT suggest to focus on the control board again since it has been already replaced (assuming it was the right...

Please add more details: what kind of unit is it?. electric, gas, else?. is it only happening when temp drops, meaning that the unit ran for a long time or whatever it was needed to reach the set...

It does seem to be a problem with the gas valve. You can check with a voltmeter the solenoid that opens the valve to see if it is getting power when it is trying to start. If it is, then the solenoid...

I'll suggest you to make it run again (check all safety switches as Northernheat suggests) and stay there until it stops. Pay attention at the moment that this happens. If you do not have any problem...

I am not very familiar with how these switches function (internal design, function and such)

Let's say that the switch it is doing its job... which is what?. trip at low temperatures?. if that is...

Does the unit EVER stops by itself?

Has it been confirmed that the wiring it is correct in the first place?

If the wiring it is correct, are the dampers getting signals to close?. if so......

I was reading this post and I was trying to find if you did the test that Labman suggested of jumping R and W?

I think that I would not expect a residential system to be designed in that way.
My...

This sounds very much like a problem I just had with my unit. Mine is also a carrier but downflow.

See my thread below. For a shortcut of all my trouble shooting, if you can have a voltmeter...

Perhaps, just to make sure that the issue is at the unit, isolate it by disconnecting the thermostat and see if it happens again.

The fan does not start just by itself. Something is making it do...

This looks like an issue I have just had. It may be that the exhaust blower (draft inducer, technically named) might be bad. One thing I would suggest you to do, is to disconnect this motor and run a...

This is just to report that from the point 3 above, I connected the draft inducer direct and then the motor stopped after 2-5 minutes. That was the cause of the problem. After I removed the part I...

Here's what I found:

1- connected a probe at the gas valve to measure voltage. At the time when the flame was being shutted off, that's exactly when the voltage was cutted. So the valve it is...

At this moment I have the meter connected and it's reading 3.5 microA. I made a mistake before, it is supposue to be microA not mA. I am waiting for the unit to fail to measure the voltage at the...

Thanks for the advice Labman.
I am going to check the sensor. According to the troubleshooting of the unit this device has to measure from 0.5 to 4.0 mA for the board to recognize the flame. What...

Here are the electrical and sequence schematics

2076

2077

What I see from the schematic is that a CPU from the board sends power to the relay and then activates the circuit going to the solenoid. I see that there are two ports (on the board) for check if...

Yes. I measured the voltage at the valve and there is no power. The two wires going to the valve solenoid, come straight from the control board without passing through another device.

Checked circuit, no issues found. I checked voltage before and after the switches and all have power when running w/o the flame on. I am wondering now about the gas valve and the control board. Any...

This is what happened, the unit did worked until the heat reached the thermostat temperature... later I decided to cover the unit for the night and while I was there it started working again. I...

So far... sometime I noticed other day, I had the unit working with the covers removed and the unit was working OK for some time, I did not wait to see if it remained like that for a longer period...

Thank you for the reply and help. I am going to check this. Do you think this can happen even that at the beginning the system does start and there is a flame?. it is only after some time that the...

Carrier split unit Model 58RAV055-GC Circuit Board at Furnace CES0110057-00
Natural Gas

I am experiencing a problem with my heat. I have a programmable zones thermostat and noticed that the air...