Amana Error Code 4R: High Limit / Rollout

Severity
Critical
Type
digital display
Estimated repair cost: $75 — $200 (parts + labor)
Warning: This error indicates a potential fire or carbon monoxide hazard. Shut down the furnace immediately and call a qualified HVAC technician or your gas company.

How to Fix Amana Code 4R

  1. Step 1: Turn off the furnace immediately at the breaker.
  2. Step 2: Ensure all vents are unblocked and clear of obstructions like snow or debris.
  3. Step 3: Replace the air filter with a clean one.
  4. Step 4: After 30 minutes, try to restart the furnace. If the error reappears, call a qualified HVAC technician for a thorough inspection and repair.

How to Reset Amana Code 4R

  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 4R Mean?

The '4R' error code on your Amana furnace indicates a high limit or rollout switch has tripped. These are safety devices designed to shut down the furnace if it overheats or if flames are detected where they shouldn't be. The high limit switch monitors the temperature inside the furnace heat exchanger, and the rollout switch detects flames outside the combustion chamber. When either of these switches trips, it means your furnace is experiencing a dangerous condition. Continuing to run the furnace could lead to a fire, damage to the unit, or carbon monoxide poisoning. It's important to address this issue immediately to ensure your safety and prevent further damage.

Common Causes

  • Dirty air filter restricting airflow, causing the furnace to overheat.
  • Blocked vent or flue pipe preventing exhaust gases from escaping properly.
  • Faulty blower motor not moving enough air across the heat exchanger.
  • Overfiring furnace due to a gas valve malfunction.
  • Cracked heat exchanger allowing flames to escape.

Diagnostic Steps

If... Check Expected
Furnace is locked out with 4R error Check continuity of the high limit switch Closed (0 ohms) when cool, open (OL) when tripped
High limit switch is open Check continuity of rollout switches Closed (0 ohms) when cool, open (OL) when tripped
Rollout switch is open Inspect for signs of flame rollout (sooting, melted wires) No visible signs of flame rollout
No tripped switches found Measure voltage to gas valve during call for heat 24VAC

Applicable Amana Models

Replacement Parts

Part OEM Number Est. Cost Where to Buy
High Limit Switch A13711-26 — Find Part
Rollout Switch A13711-30 — Find Part
Blower Motor — — —

Related Codes on Same Models

Other codes that affect the same Amana model families as 4R.

Code Description Severity
10R Communication Error Warning
1R Flame Without Call Critical
2R Pressure Switch Stuck Closed Warning
3R Pressure Switch Open Warning
5R Ignition Lockout Critical
6R Gas Valve Relay Fault Critical
7R Low Flame Signal Critical
8R Reversed Polarity Critical
9R Blower Motor Fault Warning