Amana 3 Flashes Error Code
Pressure switch circuit is not closing while the induced draft blower runs — restricted airflow or a faulty switch.
Source: Amana/Amana_2021F_InstallationGuide_HVAC_EN.pdf
What does Amana 3 Flashes mean?
Three red flashes mean the pressure switch circuit is not closing even though the induced draft blower is operating. The induced draft blower runs continuously with no further furnace operation. The control needs the switch to prove airflow before continuing the ignition sequence, so a blockage or a weak blower stalls the cycle.
Symptoms
- Induced draft blower runs continuously with no further furnace operation
- Integrated control module diagnostic LED flashes three red flashes
- Furnace does not proceed to ignition
- No heat is produced
Common causes
- Pressure switch hose blocked, pinched, or connected improperly
- Blocked flue or inlet air pipe, blocked drain system, or weak induced draft blower
- Incorrect pressure switch setpoint or malfunctioning switch contacts
- Loose or improperly connected wiring
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Diagnostic steps
Inspect the pressure switch hose
Inspect the pressure switch hose for blockage or pinching and repair it if necessary.
Check the flue, inlet, and drain
Inspect the flue and inlet air piping for blockage and proper length, elbows, and termination, and check the drain system, correcting as necessary.
Correct the pressure switch
Correct the pressure switch setpoint or contact motion if the switch is malfunctioning.
Tighten the wiring
Tighten or correct any loose or improperly connected wiring at the switch.
Power off before servicing
Turn power off prior to repair, and replace the pressure switch with the proper replacement part if it is faulty.
When to call a professional
Clearing a three-flash fault can mean diagnosing flue or condensate blockages, a weak inducer, and miscalibrated switch contacts. If you cannot safely inspect venting, verify induced draft blower performance, or confirm the correct pressure switch setpoint, call a qualified servicer. Blocked flue passages can also signal a combustion or venting problem that needs professional evaluation.
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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.
Primary or auxiliary limit circuit is open — the furnace is overheating from insufficient airflow.
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.