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gotoman for ac
gotoman for ac, HVAC Technician
Category: HVAC
Satisfied Customers: 5098
Experience:  51 years of experience install design and repair of all makes and models of AC
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Carrier furnace not working. Fan comes on, but no heat. Help

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Carrier furnace not working. Fan comes on but no heat or ignition of the gas. LED shows #23 pressure switch problem. Checked OHM for pressure switch and rollout switch; both checked out ok. What should I do next?

Take hose off pressure switch. Clean fitting with paper clip. Make sure hose has no kinks or cracks. Make sure induce draft fan is working.

Customer: replied 7 years ago.

Completed all steps and still no ignition or heat. Induction motor comes on for a little while and then kicks off, blower continues to operate.

Lets see if it is pressure switch. Jump the switch, retry furnace and see if it ignites. If it does, bad switch; but do not run it in this jumped position.

Customer: replied 7 years ago.

Finished jumping pressure switch, no change

Does induced draft motor start? Sequence of operation - Thermostat calls for heat, induced draft motor starts, purges igniter, glows, gas valve opens, ignites and flame rod provides flame.

Customer: replied 7 years ago.
Induced draft motor starts but cycles off after approx 30 seconds and nothing else happens other than fan motor continuing to run.

If you still get the code and you jumped switch and still no ignition. Bad board.

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Customer: replied 7 years ago.

You were right.

Thank you very much!

Thanks for feedback....

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