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  1. General HVAC Discussion
    I think this is a Lennox unit, maybe 11 years old. We had the outside capacitor replaced (it was near the end of its life) 3 months ago. This summer the A/C had been working fine, but a week ago the 25-year old thermostat began blinking the word COOLING and the fan wasn't coming on. Tech said...
    blinking board cooling lennox thermostat
  2. General HVAC Discussion
    Good day to all! I'm a freelance electronics engineer, and I've just been engaged by a client who is developing a product to be used in residential HVAC systems. I'm not allowed to say what the product is, but I can say that it would be connected electrically to the furnace control board. I'm...
    board control
  3. General HVAC Discussion
    I have a lennox HP26 with a retrofit defrost control and no code ledger need to know what red and green status lights are
    board codes defrost lennox
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