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About Jim Barnhart
Expertise
Fifty + years in Heating, Ventilating, Air Conditioning, Sheet Metal Manufacturing.
Semi retired since 1995,
Experience
Answer questions about , residential and commercial.
Answer questions about sheet metal fabrication.
Fifty years plus experience.
No answers for oil equipment, No answers for kitchen appliances, No answers for laundry appliances.
Education/Credentials
Hands on since 1950
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You are here: Experts > Home/Garden > Home Appliances > Heating, Air Conditioning, Fridge, HVAC > Blower relay on airhandler
Expert: Jim Barnhart - 11/4/2009
Question
QUESTION: I have a 2004 grand air split system heat pump and the blower is not workin. I changed the transformer still nor working. i turn the fan on the on setting at the t-stat nothing. Would the indoor blower relay be bad? I can press the contacts in at the cond unit and it starts up. Would the relay stop the low votage from reaching the cond. unit? Pleas help!!!!!! Mike and thanks.
ANSWER: Mike,
Are you talking about the blower in the air handler or the condenser fan in the condenser?
---------- FOLLOW-UP ----------
QUESTION: Air handler blower motor(indoor) sorry I did not make my question clear.Thanks Mike
ANSWER: Mike,
The condensing unit doesn't have anything to do with the blower in the air handler.
The 24 volts from the transformer power line + side goes to the thermostat, depending on the mode the thermostat is set on the thermostat sends the power to the blower relay.
When the thermostat calls for heating or cooling the condensing unit fan, compressor and the inside blower all start at the same time except in the heating mode the air handler blower may be on a few seconds delay.
Your original question says " I can press the contacts in at the cond unit and it starts up.
What "starts up" the inside blower or the condensing unit?
Dose every thing work as it should except the inside blower?
---------- FOLLOW-UP ----------
QUESTION: My problem is the indoor blower will not come on in heat or cool setting. Could the fan relay prevent this from happing if the transfomer is good?
Answer
Mike,
If the the blower won't come on it could be the blower motor, the motor capacitor, the blower electric wiring, the blower relay, the thermostat, the transformer.
In trying to diagnose the problem sometimes it's more important to know what dose come on?
That's the reason for asking "Dose every thing work as it should except the inside blower"?
I didn't get an answer.
Let me try it this way, when the thermostat calls for heat or cooling dose the outside condensing unit fan and compressor come on?
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