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Where is a prseeure switch on a carrier furnace
Your pressure switch will be located in the burner compartment. You will see the inducer motor that comes on when it has a call for heat. That motor is mounted to the housing inside the furnace. From that housing, there will be a small rubber tube going to the pressure switch. They are usually metal or black plastic, and round in shape. If the pressure switch is malfunctioning, try taking the hose off of the housing, being careful not to damage the hose. Blow and **** in on the hose and listen for the switch to "click" in and out. If there is no sound, it needs to be replaced. Also clear the adapter where the hose connects to the housing with a small piece of wire or something similar. These things clog up all the time and your basically making sure everything is clear before going any further. Another thing that can make a pressure switch act up is the inducer motor not working. And you might check the flue all the way through the roof to make sure its not blocked in any way. Hope this information helps and good luck.
on Jan 22, 2012
Does not ignite, no gas getting to unit to ignite. Gas supply is on.
More than likely your gas valve or control board is malfunctioning. You can use a multimeter to check for voltage at the gas valve when the furnace calls for it. In sequence, the IDM will come on, then another click that starts the ignitor which glows, then the next click will be the board sending power to the gas valve. You should have 2 wires on the gas valve, put the meter leads there and when the board calls for the gas valve, you should have 24v at the gas valve. If not, the board is faulty. If you do have the voltage there, the gas valve is faulty and needs replaced. Sometimes you can take a pair of pliers or similar tool and gently knock on top of the gas valve and it will get the valve "unstuck" which can get you some heat if needed. Hope this helps!
on Jan 15, 2012
I have a Heil H9MPDO75F2AZ QUIET COMFORT FURNACE and have replaced pressure switch and still not running
A couple things to check:
1) OK, you've replaced the pressure switch - good stuff. But the neoprene hose running from the pressure switch to the inducer motor... does it have any tears or cracks? Is the hose fittings clogged on the inducer side? Clean/replace as necessary if so. You cannot have any leaks or restrictions in this hose.
2) Try disconnecting the inducer (spent fumes exhaust fan) motor and check this motor coil for continuity with a multimeter. If the motor coil is dead, you'll need to replace the inducer (about $120.00?).
3) Check during initial startup of a heating cycle that there actually is 120vac arriving at the inducer motor coming in from the control board. If not, your board may be at fault.
Hope this helps!
on Dec 19, 2011
Igniter does not turn on
need more info....Remove the front panel and look for a sticker that will tell you what the Diagnostic flash codes are...3 . 4 . 5....etc...I service many funaces and cant memorize all the codes..lol...we always need the \manual....What does the furnace do??...Turn the power off (after you observe the code)...then turn it back on with a call for heat....What happens????The exhaust fan starts......then the ignitor starts glowing....etc.////this info is more important than flashing codes
on Dec 17, 2011
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