Ruud Furnace Repair Guide
What’s Wrong With Your Ruud Furnace?
| Is your furnace... | The problem might be your... | What's wrong? | How you can fix it: |
|---|---|---|---|
| Not heating? | Circuit Breaker/Fuse | The electrical system that powers your furnace has likely shorted. | Reset the circuit breaker that’s associated with your furnace. |
| Igniter | The igniter might either be cracked or defective. | Check to see if the igniter is cracked and needs replacing. Otherwise, test it with a multimeter for continuity. | |
| Cycling irregularly? | Thermostat | The thermostat might be adjusting incorrectly. | If your thermostat has an adjustable calibration scale, use it to adjust the heat anticipator. If this doesn’t work, replace the thermostat. |
| Not blowing hot air? | Blower Motor | Either the blower motor is burnt out, or the motor’s connect belt has snapped. | See if power is reaching the motor. If it is, but the motor isn’t running, replace the motor. If the motor runs but air doesn’t move, the connecting belt has snapped. Replace the belt. |
| Blowing too much air? | Control Board | Your furnace’s blower motor is continually being sent voltage due to a failed relay on the control board. | You will have to replace the control board. |
| Thermostat | The contact that controls the blower motor on your thermostat may be sticking. | Use a multimeter to check for continuity. If it appears the thermostat is the issue, replace the part. | |
| Starting and then stopping shortly after? | Flame Sensor | The flame sensor detects if a flame is present. If it is either defective or dirty, it will not be able to detect a flame. | If dirty, use a fine abrasive pad to clean the sensor. If faulty, replace the flame sensor. |
How to Replace Your Air Filter
- Open or slide the door panel to get access to your Amana furnace.
- You will usually find the filter near where the cold air enters the unit, either in the cold air return duct or the entrance to the blower chamber (sometimes in both locations).
- Slide out the old air filter and replace it with a new one.
- Make certain that the “air flow” signifiers on the filter are facing the correct direction, towards the blower and away from the cold air.
- Replace the panel or door to your furnace.
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Ruud Furnace Error Codes
| Error Code | What this means | How to fix it |
|---|---|---|
| LED is steadily on | Normal fault detected. | |
| Single LED flash | Failed to detect flame within three attempts for ignition, 1-hour lockout. | Reboot system. |
| Two LED flashes | The pressure switch is stuck open or induced draft blower problem detected. | Try to manually close the switch, replace the switch, or check blowers and vents for air pressure. |
| Three LED flashes | The limit switch is open, or the roll-out control is engaged. | Check for a restricted air vent, loose blower wheel, a defective blower, or a dirty air filter. |
| Four LED flashes | The pressure switch is stuck closed, or the switch won’t open. | Check for an obstruction in the pressure tubing. |
| Five LED flashes | N/A | |
| Six LED flashes | Line and Neutral are reversed. | Control board or the furnace’s ground could be defective. |
| 0 | Standby | |
| C | Compressor on (cooling or heat-pump heat). | |
| H | Gas heat on. | |
| F | Continuous fan on. | |
| 10 | 1 hour lockout. | |
| 11 | Failed ignition. | |
| 12 | Low flame sense. | |
| 13 | Flame lost. | |
| 14 | Unexpected flame. | |
| 20 | Twinning fault. | |
| 22 | Main limit open. | |
| 26 | Line and neutral reversed. | |
| 33 | MRLC (manual reset limit control) (aka roll-out) open. | |
| 55 | Pressure switch stuck closed when should be open. | |
| 57 | Press switch stuck open when should be closed. | |
| 61 | Blower fault-blower unable to run. | |
| 93 | Internal control fault. |
When to call a professional to repair your Ruud furnace
Who Should You Call?
Ruud’s Warranty Coverage
- Limited lifetime warranty on the heat exchanger: if it fails during the first 10 years of ownership, Amana will replace the entire unit.
- Limited 10-year warranty on all functional internal components
Ruud Furnace Model Numbers
Discontinued Ruud Furnace Models
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