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  1. 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
  2. Residential HVAC Forum
    As a service HVACR contractor in Florida the increasingly stringent codes have put us contractors who play by the rules at a significant disadvantage. The D.O.E. rules that took effect on March 15 mandate the appliance installed have an A.R.I. # Essentially replacing a condenser only is not a...
  3. Commercial HVAC Forum
    Hi Guys Was checking out this panasonic ceiling cassette and it displayed a 'f4' error code,the model number is CZ 06KPV 21P.Please help me
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