Question about Carrier 38CKC042 Air Conditioner

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5 min time delay for central system blower unit not reset whe serviced

My time delay is on the unit itself-not themostat-I know this because the termostat has never been worked on-but the unit in the attic has- I just don't know where on the unit I most likely wiil find the circuit board and how to reset the 5 min blower off delay. I know we need to be sure to ground ourselves before touching the unit-to prevent damage to the electronics-also my husband has a working knowledge of safety re' electricity (so necessary) and had worked on older ac units in the past-just not familiar with the newer units you described in # 3 part of your response. Thanks bunches for you help!!

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Make sure to turn off the furnace at the breaker or disconnect switch before attempting to touch the electronics of the furnace. Also look around the furnace for an owners manual. The manual will have the process for changing the blower off delay. I have given you a pretty generic process below. If you need more specific directions I will need your model and serial number. If your furnace is new enough I may be able to find your manual in our system. Good Luck:)

In most cases a circuit board model will have a small (1/4 inch x 1/8 inch) black, plastic jumper. I think I remember that some can be red also. Anyway This jumper is plugged on to two vertical prongs coming from the board. There are other bare prongs on either side of the jumper. If you look at the writing on the board you will see different numbers ranging from 60 to 190. These numbers represent seconds in time. You can change this jumper to match the seconds that you want for the blower off delay.

Posted on Jun 27, 2008

  • Don Berry Jun 27, 2008

    I forgot to add that the circuit board for the furnace is probably located in the blower compartment.

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33 LIMIT CIRCUIT FAULT - Indicates a limit, or flame rollout is open. Blower will

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45 CONTROL CIRCUITRY LOCKOUT Auto-reset after one hour lockout due to;

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