I have a inter therm furnace mmhb-056 that gives me an error code of one flash and I already replaced exhaust motor and still gives me that same one flash code

Question edited for clarity.
Question moved from Cars and Trucks category.

The problem with Furnace filters is that they are placed depending on the installation of the boiler. They can be on the left, the right or the front or even have no filter at all. Typically they are placed for easy access and slip into slots. You should be able to see the pleated filter material.

https://www.google.com/search?q=Nordyne+Furnace+MMHB+070ABHR-06+manual

https://www.google.com/search?q=Nordyne+MMHB+070ABHR-06+change+filter

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Disconnecting all power for 5 minutes is the normal reset, called a 'power reset'.

Videos and text based articles in the link

https://www.google.com/search?q=fan+reset+switch+on+model+no+MMHB-070ABHR-01+intertherm+furnace

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Number of flashes mean different things for diff models. The meanings of those flashes should be posted somewhere on the unit; usually inside front of the bottom service panel. Though you can't truly diagnose a problem by number of flashes they can give you an idea of where to look for a problem. There are a ton of videos and how-to's about furnaces on youtube by real service techs. Most modern furnaces have basically the same set-up and features so don't worry about your paticular brand; but of course that would be the best place to start looking. You could start here to familiarize yourself with your brand of furnace:

http://www.youtube.com/results?search_query=Intertherm+Gas+Furnace+&oq=Intertherm+Gas+Furnace+&gs_l=youtube.12...62316.62316.0.63907.1.1.0.0.0.0.202.202.2-1.1.0...0.0...1ac.Ko9QBdxK6OM



And then here:


http://www.youtube.com/results?search_query=gas+furnace+won%27t+light&oq=gas+furnace+won%27t+light&gs_l=youtube-reduced.3..0.5619.10061.0.11544.11.5.0.6.6.1.741.1982.0j1j2j5-1j1.5.0...0.0...1ac.1.5-0zJyxNMEo



Hope this helps.

Its probably a bad pressure switch where the contacts did not open when the exhaust fan shut off. Check the pressure switch ports and verify there not blocked.

Sounds like the thermocouple has gone which can happen any time nothing to do with reg change But I would check that pilot is not blocked causing a short pilot .

Check the air filter and also check both air intake vent for blockage and exhaust pipe for sag where water could collect.

I am trying to install a Honeywell VisionPro 8000 thermostat for my Intertherm Central Electric Furnace but I am having trouble getting to work any suggestions?

Error codes from American Standard Pub 18-HD32D2-8, which is a one-sheet document that came with my American Standard air-conditioner:

29 = not listed

129 = not listed

80 = HPCO Fault - problem is in outdoor unit - Desscription: High Pressure Monitor Fault (hard lock out, cycle power to reset)

91 = Communication Inactive Fault - problem is in air handler - Descriptions - COMM Bit Master Clock Error, COMM Heat/Cool Demand Error, Serial Motor Communication Inactive Error

91 = Communication Fault - problem is in furnace - Descriptions: Blower motor no COMM response, Inducer motor no COMM response, Loss of heat/cool demand, Loss of clock signal

91 = Communication Fault - problem is in outdoor unit - Descriptions: Loss of Heat/Cool Demand Message (COMM), Loss of Bit Master (Clock Signal)

91 = Communication Fault - Description: Comm line is dead and no bits have been received.

By the way, I do not recommend American Standard. I've had mine 14 months and it just blew up - the entire control panel blew. My advice to you - think about a different brand.

Nancy
Scottsdale, Arizona

That blinking light may be the diagnostic light. Count the blinks next time it fails. Carrier units will have two different blinks depicting the error code such as one blink followed by a pause than 3 blinks giving you an error code of 13. Then look at the wiring diagram, it will have an error code chart telling you where to start with your diagnosis. You already know that if you remove the cover it erases the error code, so look thru the small window first.