Amana 4 Flashes Error Code
Primary or auxiliary limit circuit is open — the furnace is overheating from insufficient airflow.
Source: Amana/Amana_2021F_InstallationGuide_HVAC_EN.pdf
What does Amana 4 Flashes mean?
Four red flashes mean the primary or auxiliary limit circuit is open. The circulator blower runs continuously with no furnace operation. The limit opens to protect against overheating when there is insufficient conditioned air moving over the heat exchanger, so the control runs the blower to cool the unit while it waits for the limit to reset.
Symptoms
- Circulator blower runs continuously with no furnace operation
- Integrated control module diagnostic LED flashes four red flashes
- No heat is produced
- Furnace cycles on the high limit
Common causes
- Faulty primary or auxiliary limit switch
- Insufficient conditioned air over the heat exchanger from blocked filters or restrictive ductwork
- Improper circulator blower speed or a failed circulator blower
- Loose or improperly connected wiring
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Diagnostic steps
Check the limit switches
Check the primary and auxiliary limit switches and replace either with the proper replacement part if it is faulty.
Clear airflow restrictions
Check filters and ductwork for blockage and clean the filters or remove any obstruction restricting airflow.
Verify blower speed and performance
Check the circulator blower speed and performance, correcting the speed or replacing the blower if necessary.
Tighten the wiring
Tighten or correct any loose or improperly connected wiring in the limit circuit.
Power off before servicing
Turn power off prior to repair before replacing the limit switch or blower.
When to call a professional
Repeated high-limit trips can point to a serious airflow or heat exchanger problem that is unsafe to ignore. If clearing filters and confirming blower operation does not resolve the four-flash code, or if you cannot test the limit switches and blower speed, call a qualified servicer. Persistent overheating warrants professional inspection of the heat exchanger and ductwork.
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Other Amana Error Codes
System lockout from too many failed ignition retries — the furnace could not establish or hold flame.
Pressure switch circuit is closed when it should be open — the induced draft blower is not operating.
Pressure switch circuit is not closing while the induced draft blower runs — restricted airflow or a faulty switch.
Flame sensed with no call for heat — a short to ground in the flame sense circuit.
Rollout limit open or the integrated control module fuse is blown — possible flame rollout.
Flame sense microamp signal is low — a coated, oxidized, or misaligned flame sensor.
Igniter relay fault — wiring, igniter, grounding, or control module problem.
Twinning fault — twinned furnaces are not wired or relayed together correctly.
Open fuse / no 24V power to the integrated control module — often from a voltage surge.
Igniter open — broken igniter, bad wiring, or poor grounding.
Inducer relay fault — inducer wiring, blockage, grounding, or control module problem.
Reversed polarity of 115V or 24V power to the furnace or control module.