Amana 3 Flashes

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

Diagnostic steps

1. 01

   Inspect the pressure switch hose

   Inspect the pressure switch hose for blockage or pinching and repair it if necessary.

2. 02

   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.

3. 03

   Correct the pressure switch

   Correct the pressure switch setpoint or contact motion if the switch is malfunctioning.

4. 04

   Tighten the wiring

   Tighten or correct any loose or improperly connected wiring at the switch.

5. 05

   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.