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American Standard Furnace Freedom 80 blower won't stop?
I have an American Standard furnace/air conditioning unit at home. It has been working for over 10 years. Then one day, the blower won't shut off (when using the furnace). The heater control is working because the burner would come on when calling for heat. When the desired temperature is reached, the burners would go off but the blower would stay on. Actually now the blower is on all the time, even with the thermostat turned off. I was told that it can be the blower relay. Can it be replaced or do I need to replace the whole board? And where can I buy a replacement? (Please include the website).
Did some more troubleshooting with my friend last night. We now think that the logic chip maybe the problem because it was sending command to the relay to give power to the blower. In that case, I will probably need to replace the whole board. The thermostats is working because the heat and the air conditioning both work. When we switch off and on the power switch, I could hear one of the relays clicked. (Not sure if it was the right one because there are four/five of them). Now I wonder where I can buy the logic board. I don't want to buy the wrong one and blow something up.
2 Answers
- ChuckLv 49 years agoFavorite Answer
Yes, it sounds like the board. If the relay on the board goes out it turns the fan on all the time, kind of a safety. The board will usually have 2 part #'s, (along the edge and/or on the top), one is the A/C Mfg part # like, Trade or Carrier, the other is the board makers part#, like White Rogers or TI.
If push comes to shove, you can call the an A/C Parts place with the model and serial # of the furnace and they should be able to give you the part #. The you can find it for sale online.
Source(s): HVAC TECH - esauLv 45 years ago
Measuring for ohms is gonna get you nowhere. You must measure voltage. Take apart the connector that connects to the ignitor. Put your leads into the connector to peer in the event you get voltage to the ignitor. Its both a 120v or a 24v ignitor. Im now not sure with that certain furnace, mainly 120v. For those who on no account get any voltage than there may be another crisis someplace earlier than the board requires ignition. Investigate the pressure swap(s). Measure every aspect of the switch to floor to ensure the switch is closing and letting the voltage go. Verify all limits and roll-out switches. Just comply with the voltage based on sequence of hobbies. When you still cant determine it out after that you are going to ought to name an HVAC tech. I respect a do it your selfer when you consider that i'm one, but routinely you desire a professional. You additionally don't want to do something so one can void any assurance so be careful.
