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pressure switch open
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  1. HVAC
    I have a Day and Night single stage high efficiency 80,000 btu furnace that is roughly six years old. I live at roughly 4500ft. I've had nothing but issues with my pressure switch since the house was built six years ago. Every winter generally starting in December, it will trip constantly. Most...
  2. HVAC
    Hey Gang, First time poster here. Went to fire up the heat for the first time this season yesterday, and after 30 minutes I noticed it had been blowing the whole time, but there was no heat. This is a model number GUI075A012AIN. Taking a closer look, I saw that I had three blinking lights...
  3. HVAC
    Hi, I'm an engineer and have some technical know how. I will say upfront I have not exhaustively searched all the threads on this furnace. I have a GMS8 furnace, vertical, natural gas, single stage, about 10years old. It started as an intermittent problem, of the furnace starting up, the...
  4. HVAC
    Having trouble with the pressure switch .. Ill give a brief history on this unit which may help in diagnosing this problem . Unit installed by professionals in 1996. Only had one repair also by installers ..a new blower motor in 2007. At that time the tech showed me how to do a little...
  5. HVAC
    My two-year-old Reznor UDAP garage heater stops heating. The fans work, but no heat. The green light flashes twice, which the manual says indicates a pressure valve problem. This has happened twice so far this season, both times when the outside temperature has dropped below minus 10 celsius...
  6. HVAC
    Hello - I have a 100 mbtuh 90+% efficiency propane furnace manufactured by Heil, complete model number - N9MPD100J20A2. It is direct-vented outside via a concentric vent. Manufactured late 2007. Ever since I moved in in 2009, I have been battling the same problem – the furnace would...
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