Amana Error Code 5R: Ignition Lockout
How to Fix Amana Code 5R
- Step 1: Turn off the furnace: Locate the furnace power switch (usually on the side of the unit) and turn it to the 'off' position.
- Step 2: Check the gas supply: Ensure that the gas shut-off valve near the furnace is fully open. Also, check that other gas appliances in your home are working.
- Step 3: Call a qualified HVAC technician: Do not attempt to troubleshoot the furnace yourself, as this could be dangerous. Contact a licensed HVAC professional to diagnose and repair the problem.
How to Reset Amana Code 5R
- Turn off the furnace power switch, usually located on or near the unit.
- Turn off the circuit breaker for the furnace. Wait 30 seconds.
- Restore power at the breaker and flip the furnace switch back on.
- Set the thermostat to call for heat. If the error code returns after 2-3 ignition attempts, the fault requires repair.
Resetting clears the code from the display but does not fix the underlying fault. If the code returns after reset, proceed to the diagnostic steps above.
What Does Amana Error Code 5R Mean?
The '5R' error code on your Amana furnace indicates an 'Ignition Lockout'. This means the furnace tried several times to light the burners but failed. After multiple failed attempts (typically 3-5), the furnace control board shuts down the gas valve and blower motor as a safety precaution to prevent a dangerous buildup of gas inside the unit and your home. This lockout requires a manual reset in some cases, but more importantly, it signals an underlying problem that needs to be diagnosed and fixed by a qualified technician. Ignoring this error could lead to a hazardous situation.
Common Causes
- Dirty or faulty flame sensor: The flame sensor doesn't detect the flame, even when one is present, causing the control board to shut off the gas.
- Blocked or restricted gas supply: A closed gas valve, kinked gas line, or malfunctioning gas regulator can prevent gas from reaching the burners.
- Failed igniter: The hot surface igniter (HSI) is not getting hot enough to ignite the gas, or it has failed completely.
- Faulty gas valve: The gas valve is not opening to allow gas flow to the burners.
- Defective control board: The control board is not sending the correct signals to the igniter or gas valve.
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| Furnace is in lockout and HSI is not glowing during start-up | Measure voltage to the HSI using a multimeter | 120 VAC during the ignition sequence. If no voltage, check the control board. |
| HSI glows, but the furnace doesn't ignite | Measure the flame sensor microamps (uA) with a multimeter after ignition. | 1-10 uA DC. Low or no reading indicates a dirty or faulty flame sensor. |
| Gas valve doesn't open | Measure the voltage to the gas valve during the ignition sequence. | 24 VAC. No voltage indicates a control board or wiring issue. |
| Gas pressure is suspected to be low | Measure the gas pressure at the gas valve using a manometer. | Typically 3.5-4.0 inches of water column (WC) for natural gas. Refer to the furnace's rating plate for the correct pressure. |
Applicable Amana Models
Replacement Parts
| Part | OEM Number | Est. Cost | Where to Buy |
|---|---|---|---|
| Hot Surface Igniter (HSI) | — | — | — |
| Flame Sensor | — | — | — |
| Gas Valve | — | — | — |
Related Codes on Same Models
Other codes that affect the same Amana model families as 5R.
| Code | Description | Severity |
|---|---|---|
| 10R | Communication Error | Warning |
| 1R | Flame Without Call | Critical |
| 2R | Pressure Switch Stuck Closed | Warning |
| 3R | Pressure Switch Open | Warning |
| 4R | High Limit / Rollout | Critical |
| 6R | Gas Valve Relay Fault | Critical |
| 7R | Low Flame Signal | Critical |
| 8R | Reversed Polarity | Critical |
| 9R | Blower Motor Fault | Warning |