Amana Error Code 8R: Reversed Polarity

Severity
Critical
Type
digital display
Estimated repair cost: $100 — $250 (parts + labor)
Warning: This error indicates a dangerous electrical wiring problem. Immediately shut off the furnace at the breaker and call a qualified HVAC technician or electrician.

How to Fix Amana Code 8R

  1. Step 1: Immediately turn off the furnace by switching off the corresponding breaker in your electrical panel.
  2. Step 2: Do not attempt to troubleshoot or repair the wiring yourself. Electrical work should only be performed by qualified professionals.
  3. Step 3: Contact a licensed HVAC technician or a qualified electrician to inspect and correct the wiring issue.

How to Reset Amana Code 8R

  1. Turn off the furnace power switch, usually located on or near the unit.
  2. Turn off the circuit breaker for the furnace. Wait 30 seconds.
  3. Restore power at the breaker and flip the furnace switch back on.
  4. 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 8R Mean?

The '8R' error code on your Amana furnace indicates reversed polarity in the electrical wiring. This means the hot and neutral wires are connected incorrectly. While it might seem like a minor issue, reversed polarity can create a significant safety hazard. Your furnace's safety mechanisms and flame sensor rely on correct polarity to function properly. With reversed polarity, the furnace chassis can become energized, posing a shock risk. Also, the flame sensor might not detect the flame reliably, leading to erratic operation or even a dangerous buildup of unburned gas. Because this issue affects the entire electrical system of the furnace, it's critical to address it immediately to prevent potential damage or injury.

Common Causes

  • Incorrect wiring during initial furnace installation
  • Wiring error introduced during electrical work on the circuit
  • Loose connection in the furnace's electrical junction box
  • Damaged or improperly grounded electrical outlet

Diagnostic Steps

If... Check Expected
Furnace displays 8R error Measure voltage between neutral and ground at the furnace disconnect 0-2 VAC. Higher voltage indicates reversed polarity or a neutral-ground fault.
Voltage between neutral and ground is >2VAC Inspect wiring at the furnace disconnect and electrical panel for proper connections Hot wire connected to the breaker, neutral to the neutral bus, and ground to the ground bus.
Wiring appears correct at the panel and disconnect Check the resistance between the furnace chassis and ground Should be near 0 ohms. High resistance indicates a grounding issue.
Grounding issue found Inspect the grounding wire connection at the furnace and the electrical panel Secure connection with no corrosion.

Applicable Amana Models

Replacement Parts

Part OEM Number Est. Cost Where to Buy
Ignition Control Module — — —
Flame Sensor — — —
Wiring Harness — — —

Related Codes on Same Models

Other codes that affect the same Amana model families as 8R.

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
5R Ignition Lockout Critical
6R Gas Valve Relay Fault Critical
7R Low Flame Signal Critical
9R Blower Motor Fault Warning