Question about Carrier 38CKC042 Air Conditioner

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Fan running but no heat

Carrier Furnace Model#40AQ030300BB

Any help is appreciated. Could it be the heat coil or relay?

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Most likely heat sequencer. Fan relay will run even if this is out. check if you have continuity in the coils first.

Posted on Feb 14, 2009

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It could be the circuit board, relay, heat strip coil or limit. If you have the fan switch at the t-stat in auto and the fan is running constantly it's probably a high temp limit that tripped. Was your filter clean or dirty? If you had a dirty filter and/or A/C coil it will restrict air flow and cause the furnace to overheat.

Posted on Jan 18, 2009

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Why won't my carrier furnace come back on?model number 58rav095.It was running and heating,but makes a horrible noise on start up.Is it the motor going out?


If the noise is coming from the fan coil unit then it could be the blower motor. If the bearings are failing it will make noise on start up and run. But after a period of time it will overheat and the overload protection switch will lock it out to keep it from running until it cools down.

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I have a Carrier 58PAV model furnace and the blower is not engaging when I turn either the furnace or AC on. It worked fine last weekend. I have powered the unit off and let it sit for 5 minutes and then...


The only thing you can do at this point is
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RHEEM OIL FURNACE MODEL ROBD 067 LBEA BLOWER


You will likely need to install an isolation relay in the W circuit from the thermostat. Some thermostats rob a small current through the W circuit to power the thermostat. This small current can be enough to start the fan circuit timer. You can test this by disconnecting W at the furnace and allowing the timer to shut down. If the fan shuts off with the W disconnected you can install a simple relay.

The relay coil will be connected to Common on one side and the W from the thermostat to the other. Then you will run a wire from R on the furnace to the relay and from the N.O. Contacts to the W terminal on the furnace. This will kill that signal that is starting the timer and the W can steal it's power through the coil back to common.


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Furnace runs OK, but blower runs again a few seconds later


Could be a defective thermostat in the plenum.
When a gas furnace shuts down the fan(blower) will run until the plenum cools to the safe range. Usually 1 and 1/2 minutes.
Intermittent operation is a defective thermostat or relay.

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3 amp fuse blows on a carrier 58mcb furnace board


Hi!!! Does your ac unit work fine?If not check your low voltage problem..You have a low voltage problem check the wire going out to your condensor make sure that they are not touching..Good luck..Check low voltage wires..short in progress..

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Model number for Carrier furnace with issue for blower 5 minute off delay


I believe that this model number is for an air conditioner evaporator coil. This unit is probably directly attached to your furnace. The Model number for the furnace will be located in the compartment where the flames can be seen. It will be on a sticker or plate that contains lots of other information too like BTU/h, Volts etc...


The number you gave me gives me this info:
Cased air conditioning evaporator coil.
3 Tons
Horizontal application

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