Question about Carrier 38BRC048 Air Conditioner

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Carrier A/C Intermittent Shut-down Problem

I'm currently experiencing an intermittent problem with my Carrier A/C Model FC4BNF042. It shuts down completely and fails to restart. When in this condition, there is no LCD display on the thermostat indicating the unit is on. I've also checked but was unable to detect 24V from the output side of the transformer although the 220V input was fine. I isolated the transformer, thinking it may be bad, and performed a simple resistance check. The primary side read 74 ohms and the secondary 1.7 ohms. Even though it appeared a little high I assumed the transformer was okay since it did not have an obvious short or open coil. I proceeded to visually check all the wiring, components, fuses, etc. and all appeared to be fine in the air handler unit. I have a gut feeling the thermostat may be defective. Is there something that I may be overlooking and could check before I go out to and buy a new thermostat? By the way, the unit began working again about an hour after I last checked it.

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It sounds like there is something in the system that is over heating. A t-stat will either work or it won't there are relays that have 24v coils and can become weak. If your air handler is shutting down it shut down the condenser, if the air handler is staying on but condenser is shuting down check the outside contactor. I am an a/c contractor and can be contacted at 504-722-3946 Eddie.

Posted on Sep 29, 2008

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