York Furnace Repair Guide
Common York Furnace Problems and Troubleshooting
How to Replace Your Air Filter
- Before you can replace your filter, check the access panel for the exact filter size as well as the part number.
- When ready, open the filter access panel.
- Remove the old filter, which should be located near the return air duct and blower.
- Insert the new air filter, remember to make certain that it’s installed in the same direction as the previous one.
- Replace the filter access panel.
York Furnace Error Codes
| Error Code | What this means | How to fix it |
|---|---|---|
| Slow green flash | This is normal operation. | N/A |
| Slow amber flash | This is normal operation with a call for heat. | N/A |
| Rapid red flash | This is a twinning error, incorrect 24V phasing. | You should check the twinning wiring. |
| Four amber flashes | The control is receiving a “Y” signal from the thermostat without a “G” signal, and this indicates that the thermostat is wired incorrectly. | You should check the thermostat wiring. |
| One red flash | Flame sensed when there was no call for heat. | You should check for a leaky or slow closing gas valve. |
| Two red flashes | The pressure switch contacts that are normally open are stuck in the closed position. | You should check for a faulty pressure switch, miswiring, or an open pressure switch contact that didn’t close after the inducer was energized. |
| Three red flashes | Many issues could cause this. | Check for a faulty inducer, blocked vent pipe, broken pressure switch hose, or a faulty pressure switch. |
| Four red flashes | The contacts on the main limit switch that are normally closed have opened. | You should check for a dirty filter, an improperly sized duct system, an incorrect blower speed setting, an incorrect firing rate, or a faulty blower motor. |
| Five red flashes | The contacts that are normally closed have opened during the rollout switch. The rollout control is manually reset. | If it has opened, you should check to see if there’s a proper supply of combustion air. Otherwise, you can inspect the inducer’s operation, the primary heat exchanger for a sign of failure, or the burner for potential issues. Remember to reset the switch and cycle power to the control. |
| Six red flashes | After the unit began operating, the pressure switch opened four times during the call for heat. | The furnace will lockout for 1 hour and then restart. |
| Seven red flashes | The flame could not be established. The no-light condition occurred three times during the call for heat before locking out. | You should check for low gas pressure, a faulty gas valve, a dirty or defective flame sensor, a faulty hot surface ignitor, or the burner for potential issues. The furnace will lockout for 1 hour and then restart. |
| Eight red flashes | The flame has been lost five times during the heating cycle. | You should check the system for low gas pressure, a dirty or faulty flame sensor, or a defective burner. The furnace will lockout for 1 hour and then restart. |
| Nine red flashes | The line voltage polarity has been reversed or there’s a grounding problem. | You should check the furnace grounding and the polarity at both the furnace and branch. |
| Ten red flashes | A flame has been sensed with no call for heat. | You should check the gas valve as well as the gas valve wiring. |
| Eleven red flashes | This is usually caused by a failed blower motor or blower wheel. | After correcting the failure condition, you will want to cycle power to the control which will reset the hard lockout condition. |
| Twelve red flashes | This indicates an open igniter circuit. | You should check for a disconnected or loose wire, or a cracked or broken igniter. |
| Steady red | This is a control failure. | You should replace the control board. |
When to call a professional to repair your York furnace
- If your YORK furnace begins to spontaneously leak or drip.
- If your unit stops producing heat.
- Strange noises begin to come from your YORK furnace, such as banging, whistling, gurgling, etc.
- If you’re noticing that your boiler is acting strange, and your furnace is continuously turning itself on and off.
Who Should You Call?
York’s Warranty Coverage
YORK Affinity™ Series
YORK LX Series
YORK Latitude™ Series
York Furnace Model Numbers
Discontinued York Furnace Models
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