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Old 05-18-2012, 05:47 AM   #16
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HVAC condensor fan outside intermittant


Merged this with you original thread.

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Old 05-18-2012, 05:50 AM   #17
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HVAC condensor fan outside intermittant


Must still have power coming to it from somewhere if it gets hot when you plug it back in. Trace the wires back and see if another power source is shorting to them.

I wouldn't swap boards, since a short as I said above could also harm the other board.
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Old 05-18-2012, 11:43 AM   #18
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HVAC condensor fan outside intermittant


Ok new update. Resistor does not get power with tstat harness plugged in. When plugged in and the circuit breaker is on, resistor gets hot. Leaving for 4 days, when I get back I will swap boards as I think I am ok with this new info.
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Old 05-22-2012, 04:31 PM   #19
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HVAC condensor fan outside intermittant


I've been cross posting on another forum not sure who it is but hi!

Anyway it ended up being the defrost sensor. After ohming it the sensor read well outside of limits, roughly 150 ohms @ 80F. From what I can tell a normal reading is more like 8000-10000 ohms @ 80F (although I do not have access to the service manual to confirm).

I plugged in everything one by one to the defrost board and checked the resistors temp each time starting with the t-stat wires, then the contactor and fan, then some other plug that went to some stuff inside the unit, then the thermistor. If I were to ever do this again, now I know how to ohm the thing to check it for operation. I swapped the sensor to the other unit and plugged it in, and the same resistor got hot on the different board, so it was not the board.

What frustrates me as the homeowner is this. When the techs came, they did not run these simple tests. It was up to me, the homeowner, to ohm the motor, check the bearing play, check the cap, and check the thermistor. What is the homeowner paying the diagnosis fee for? Frustrating, but I have learned a lot.

The defrost sensor aka thermistor was $23. I bought two, one for each unit, to replace as preventive mx as they are cheap. Interestingly enough you cannot buy HVAC parts in my city, no distributor will sell them to the public. They only deal with licensed contracts. So I had to order online. I can understand their view as if they sell to the public, it's possible contractors will boycott them as they are undercutting their competition.

This has been interesting I found myself enjoying it more than working on cars. Even looked at some community college HVAC courses. This might be a viable backup career for me.

Last edited by wheelsup; 05-22-2012 at 06:48 PM.
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Old 05-23-2012, 11:05 PM   #20
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HVAC condensor fan outside intermittant


Quote:
Originally Posted by wheelsup View Post
What frustrates me as the homeowner is this. When the techs came, they did not run these simple tests. It was up to me, the homeowner, to ohm the motor, check the bearing play, check the cap, and check the thermistor. What is the homeowner paying the diagnosis fee for? Frustrating, but I have learned a lot.
I feel your pain. Finding a competent HVAC tech is a crapshoot. I'm lucky, we used the same guy for 20 years and I do trust him. Unfortunately, he no longer does installs (too old) so we ended up with a cowboy installation for our last two systems. Luckily I was able to "head a couple of problems off at the pass". But I didn't notice that they had installed a 120,000 BTU furnace instead of the 70,000 BTU furnace they were supposed to install! Wondered why we were getting so many backpressure error codes and system cutouts with the 2" PVC vent piping.

We should just clone Been and Doc!
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Old 05-23-2012, 11:34 PM   #21
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HVAC condensor fan outside intermittant


A lot of times we ourselves learn on the job, I know I do. In all honesty it might have taken a few trips or possibly one lengthy trip for myself to figure the op's problem out. It's not one that easily sticks out or openly presents itself unless you've come across it before. I myself have not. I can only recall testing one resistor on a thermostat which was bad.

Half of being an hvac tech is research, finding out what to research being when we come across a certain situation which stumps us. And the other half, if you haven't anything to hide, is being truthful.

Thanks for the compliment, though!
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Old 05-24-2012, 11:25 AM   #22
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HVAC condensor fan outside intermittant


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Originally Posted by Doc Holliday View Post
A lot of times we ourselves learn on the job, I know I do. In all honesty it might have taken a few trips or possibly one lengthy trip for myself to figure the op's problem out. It's not one that easily sticks out or openly presents itself unless you've come across it before. I myself have not. I can only recall testing one resistor on a thermostat which was bad.

Half of being an hvac tech is research, finding out what to research being when we come across a certain situation which stumps us. And the other half, if you haven't anything to hide, is being truthful.

Thanks for the compliment, though!
That's why I continued posting on another hvac site for the "pros" only. I know they hate that people work on the equipment themselves. I get it. Hopefully some techs will see my post and put that in their bucket of experience.

It makes me feel better about the company I use to hear you say that. I do trust them, the techs there have never tried to lead me astray. Now that I know more about the equipment I can be more educated when they come for anything that is more technical in nature.

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