occasional breaker switch reset needed to turn ac condenser fan

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Old 07-26-19, 06:03 AM
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Exclamation occasional breaker switch reset needed to turn ac condenser fan

Hi All,

I'm having an issue where my outdoor A.C. unit fan stops working while inside ac unit is working - ultimately not blowing cool Air.

In order to restart outdoor ac fan, I have been resetting breaker switch (no it is not tripping automatically, i manually reset it) and outdoor fan starts and AC starts blowing cool Air.

In this forum someone had similar issue and replacing breaker switch seem to have fixed the issue for them but I have called electrician and he said that if breaker switch is not tripping by itself then it's not breaker problem and something with ac.

This issue happen randomly - sometimes ac works fine for 2 days, sometimes 4 days until fan stops working and I have to reset breaker switch.

Any advise here please?
 
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Old 07-26-19, 06:33 AM
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You may have a bad fan capacitor, replace that first and see if the fan starts normally.
 
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Old 07-26-19, 06:52 AM
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ac contractor checked capacitor and said capacitor is good.
 
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Old 07-26-19, 08:12 AM
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Welcome to the forums.

You need to observe what the condenser is doing. It sounds like the fan is failing and the compressor is shutting down on thermal overload (high heat). A visual check of the capacitor is not enough. It needs to be measured with a meter or replaced.
 
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Old 07-26-19, 08:29 AM
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Thanks Pete! I will measure capacitor and see if it's need replacement. In a meantime, do you think there's anything else that may create this issue? It's strange that this doesn't happen constantly but random.

I forgot to share that I have Trane TEM6 AC unit. When we check it, it shows 4 red light flash, which they say it's hard lock out.
 
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Old 07-26-19, 09:18 AM
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So by fan, you mean the entire condenser is shutting off? If so that’s not a capacitor.
The code schematic will be in the unit. What does 4 flashes mean?
 
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Old 07-26-19, 09:50 AM
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Hi, Hard lock out could mean the compressor is shutting down on Hi head pressure due to the fan not running, capacitors are cheap, just replace it, also does the fan turn freely?
Geo
 
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Old 07-26-19, 09:52 AM
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Yes entire condenser unit.
Here's what manual says for 4 flashes:
4 FLASH = Hard Lock Out (can only be cleared with power cycle). Occurs after 4th trip of LPCO. (Note 7)
Note 7 = During a Hard Lockout, the X2 relay opens so that the Y signal does not pass through.
 
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Old 07-26-19, 09:56 AM
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So you have a low pressure problem.
LPCO=Low Pressure Cut Out.
Your refrigerant circuit needs to be checked.
 
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Old 07-26-19, 01:43 PM
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Thank you. I will have someone take a look at it.
 
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