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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...
  2. General HVAC Discussion
    Hello, I am seeing an error code that is otherwise unlisted on the wireless MRCH1 thermostat, which connects to a ducted Mitsubishi electric unit in the attic. The display just reads "E 27" The second zone for the first floor is run by a Mitsubishi Mr Slim unit, which is working fine. None of...
  3. Residential HVAC Forum
    My school has a bunch of Carrier EMI thermostats with the receiver modules. Since I am pretty tech-savvy, my instructors asked me if I could find a use for them. How do i hook these up and connect them to a router? Calling Carrier didn't help. Any information/help is much appreciated. Thanks in...
  4. Residential HVAC Forum
    What is everyones thermostat preference for a residential programmable thermostat that has wifi?
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