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erik11 10-28-2006 01:14 PM

RUUD Gas Furnace Pressure Switch?
I have a RUUD gas furnace. I reset it last night, but it tuened off on its own. Now it won't start back up. The 4 flashses say its a pressure switch thats closed. Can't find the manuel. Where is the pressure switch? Please help! Thanks.

coolmen 10-28-2006 03:49 PM

whats the model #,pressure switch is round object and will have a hose connected to it as well as wires, furnaces have 2 pressure switches one for chimny and one for condinsate switch (newer units 90% + units need model ##

#CARRIERMAN 10-30-2006 09:20 PM

Hi erik11

The pressure switch is a round metal piece that is mounted just below the little fan that runs when the burners are on, it will have a short piece of hose that runs to the little fan (purge fan). There will be two wires on it that goes to a little switch, sometimes you can tap on the switch lightly with the handle of a screw driver. Be extremly careful when doing this, it is not a permanent fix but could get you through until you can get another one. When you do this you will need to unplug furnace, this will also reset fault code.

Good luck, let us know if we can help further.

Justin1635 11-01-2006 08:13 PM

check your hose. it possibly fell off

acefurnacefixer 11-24-2006 09:20 AM

A blocked flue or intake, as well as a backed up condensate drain will give you a pressure switch fault.

JamesS 12-05-2006 02:17 PM

I have a new Rudd 90 plus and I'm having the same problem. When I jiggle the switch, the furnace fires up and all is well until the next time it stops working. The nights are getting cold so I'm getting up to jiggle it more frequently which is becoming a pain. The part number is MPL-9300-V-1.50-DEACT-N/O-VS. Does anyone know a good place on the internet to get a replacement? I found one but it was $260! This can't be right. The thing is just a plastic vacuum switch.


coolmen 12-05-2006 05:25 PM

ill look on my van

jdsatyr 12-06-2006 10:51 PM

pressure and flow low
I also had a pressure error reading, flashes indicated open switch upon further inspection, found a dead (baked) snake in the fan area.:eek:.... no snake no problem..... :laughing:

747 12-06-2006 11:39 PM

I can't believe all the problems people have with forced air furnances. I'm glad i don't have one. I have hotwater boiler its 43 years old and still going strong.:laughing:

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