I replaced the batteries, does not click when it calls for heat in the thermostat. fan blows but no heat. I took off inspection door, held the safety switch in, a blue light is blinking constantly, what is the cause of this, possible igniter bad or thermostat bad?

The fan for the combustion chamber is running, while two blue lights blink fast.

  • There should be two LEDs, #1 and #2. We'll have to know what each one is doing, and whether or not they are flashing fast or slow – Tester101 Oct 27 '15 at 22:30
  • the fan for the combustion chamber is running while two blue lights blink fast – bill sankot Oct 27 '15 at 23:09
  • Label the wires attached to the pressure switch, or take a photo, or something so you remember how it's hooked up. Set you meter to read ohms or continuity. Pull the wires off the pressure switch, and place one probe one each terminal. With the inducer running, you should measure CLOSED, or a small (not infinite) resistance. – Tester101 Oct 27 '15 at 23:29
  • If the pressure switch is not closing, you'll have to try and figure out why. Check the vent and intake, to make sure they're not blocked. Make sure the condensate line isn't blocked, or backing up. – Tester101 Oct 27 '15 at 23:31
  • I am going from at work PC to a home PC, this will take a little time to travel to, please send any advice on this problem it would greatly be appreciated. – bill sankot Oct 27 '15 at 23:32

Lennox G26 diagnostic codes...

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