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Yes, Sir. My unit, a Lennox SL280UHV, is not blowing cool…

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Yes, Sir. My unit, a Lennox...
Yes, Sir.
My unit, a Lennox SL280UHV, is not blowing cool enough air to get our house cool enough. There's an error code displayed, E250.
Please advise.
Submitted: 3 years ago.Category: HVAC
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Answered in 2 hours by:
6/5/2015
HVAC Technician: airheatman, HVAC Technician replied 3 years ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,366
Experience: Furnace, A/C and heat pump specialist.
Verified
Hello. My name is ***** ***** I'll do my best to help. Let's get started and see what we can do.The E250 error code should not have anything to do with the AC. That is a furnace code indicating that one of the limit switches is open in the heating circuit. Does fan seem to be running normal speed and does it cycle off when you turn off the ac?
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Customer reply replied 3 years ago
Yes, fan cycles off & normal speed.
HVAC Technician: airheatman, HVAC Technician replied 3 years ago
That is strange with the E250 error code.Does heat work if you turn to heat? Also in cool mode, make sure outdoor unit is coming on and tell me if the large copper line from outdoor unit to indoor coil is cold.
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Customer reply replied 3 years ago
Haven't tried the heat.
Outdoor unit goes on as normal.
Copper coil is cold but rechecking
HVAC Technician: airheatman, HVAC Technician replied 3 years ago
The large copper line should be what we used to call 'Ber can cold". About as cold as a beer can or coke can just taken out of ice chest. Temp difference between return air and supply air should be about 17 to 20 degree difference.
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Customer reply replied 3 years ago
No, Not that cold at all, slightly cool
HVAC Technician: airheatman, HVAC Technician replied 3 years ago
If outdoor is running and indoor is running, but suction line is not cold and sweating, most likley system is slightly low on refrigerant.
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Customer reply replied 3 years ago
How often should this be refilled or recharged?
HVAC Technician: airheatman, HVAC Technician replied 3 years ago
System is sealed and should never need recharged, But with copper being imported from China due to national trade agreements, it is pretty common today to develop leaks. Do you by chance have access to a set of refrigerant gauges so we can check charge.
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Customer reply replied 3 years ago
Do not have guages
HVAC Technician: airheatman, HVAC Technician replied 3 years ago
My suspicion is low charge, but without gauges, it will be necessary to call in a tech. You will probably need refrigerant so most likley going to result in a service call anyway.
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Customer reply replied 3 years ago
Ok. So what if it's a leak & it's a new unit less than one year old, will the safe problem happen again w cheap China parts?
HVAC Technician: airheatman, HVAC Technician replied 3 years ago
If system is indeed low, I would have them make every effort to locate the leak and make repairs while warranty still covers it.Most manufacturers have started stating in their warranties, that they will only cover refrigerant leaks for 1 year although parts may carry a 5 or 10 year warranty.
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Customer reply replied 3 years ago
It's under warranty, < 1 year
How do I ensure I get quality parts?
HVAC Technician: airheatman, HVAC Technician replied 3 years ago
I recommend making sure to use an authorized Lennox dealer. Preferably company who installed if possible.
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Customer reply replied 3 years ago
Ok thanks
HVAC Technician: airheatman, HVAC Technician replied 3 years ago
Thanks for allowing me to work with you. Hope information was helpful. Feel free to follow up with results.
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Customer reply replied 3 years ago
Ok
HVAC Technician: airheatman, HVAC Technician replied 3 years ago
You can come back to question anytime for 30 days
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