Can you help me troubleshoot my Amana Air Command 80 gas-fired furnace?
- Today it stopped heating the house; three red blinks were visible. The instructions say this means the "pressure switch is stuck open".
- I could see the "top" (smaller" motor wasn't spinning) but the bottom (bigger) motor was spinning; so, I guessed, there was no vaccum to the pressure switch - hence - the pressure switch was stuck in the open (off) position.
- To test, I removed the hose from the top (smaller) motor & sucked on it.
- This self-induced vacuum caused the diaphram to move which caused the mechanical switch connected to the pressure valve to close (I could see the switch move when I sucked on it).
- The flame ignighter heated up and the gas started burning. The three blinking red LED signal went out; I thought I "fixed" my furnace.
I cycled the power a few times while I cleaned the filters and blew dust from around the wires.
But ...
- Then the Amana Air Command 80 gas-fired furnace stopped heating again; this time, four red blinks were visible!
- Now the opposite ocurred; the "top" (smaller) motor was now spinning but the bottom (big) motor was not spinning. No air was circulating through the house.
- Four blinks indicate an "open Limit Control (primary or auxilliary)".
- If I cycle the power to the furnace, it works for about ten minutes and then the bottom (big) motor stops spinning and the four blinks start again.
I have a few questions: a) How can I troubleshoot this Amana Air Command 80 gas-fired furnace? b) Is there a reset switch somewhere? c) Is there a maintenance guide on the web somewhere?
Thanks, Donna