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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