Question about Heating & Cooling

1 Answer

Fault code 6 flashes

I am a heating tech and i am just confussed. Well i think its the board but just looking for a second opinion. Call for heat and the ventor motor starts. after a few seconds the ventor quits and the main blower starts and the fault code states it is reverse wiring, something to do with the ignitor or low voltage. The power comming from the board to the ventor is 120 to ground and 168 volts to neutral. I also have a an amp draw of 10amps at the ventor but if i check the amps at the line wire coming into the furnace i only draw about 1 amp which is normal. I am pretty sure it is the board but i am not used to the american standard furnaces. It is a new american standard stage with reg motor. The main power coming in is good and polarity is good and properly grounded as far as i can see.

Posted by on

  • subzero_hc Jan 20, 2009

    The problem is that the ventor motor starts. and runs for like 5 seconds and shuts off. The voltage to the ventor is 168volts from line to the neutral in the plug connected to the ventor. when you go from line on the plug to ground on the plug you get 120volts. And if i am getting a 10amp amp draw on the ventor and only 1amp on the main power to the board, my experience would tell me there is alot of resistance in the circuts in the board that send power to the ventor. It just seems weird how i am getting 168vost when the power coming in is 120 and 1amps at the ventor and 1 amp overall. ..... i don't think the 24volt side has anything to do with this problem. it would however if the ventor was running longer and the fault code said the pressuse switch was not closing.

  • subzero_hc Jan 20, 2009

    Please explain how the 24volt system would cause the readings i am getting on the 120 side, ie. High amp draw and high voltage. again the ventor motor doesn't even stay running long enough( 5 sec, not even long enough to do a full pre-purge) for the pressure switch and the other compenents in the sequesnce of operation to get a chance to complete. If there were a break or faulty part in that loop the board would flash a different code. The code that is flashing indecates that it could be *a voltage issue, bad grounding, reverse polarity, ingnitor (resistance is good).. These all are properly hooked up. The furnace has been working for a month not and was installed by another contractor. The issue i am wondering about is how i would get 10amps only on the ventor and not on the main power to the board. would these boards sense that there is a high draw/high voltage to the ventor? I think a faulty relay in the board would cause the high amp draw to the ventor. Could it?


1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 334 Answers

Well, as you know the blower comes on because there is a control voltage (24V) failure.

I would trace out all the 24V wiring with the schematic to make sure someone didn't cross up a wire.

Then ohm out each component to make sure there is not a bad part in the 24V cycle.

Make sure you have voltage going to the ignitor from the board.

Obviosly the draft inducer motor is working, so thats not the issue. However the pressure switch could be having problems, thus interupting the 24 V cycle.

If you have power to the ignitor, and no ignitor op, then the board is OK. If the board is not sending power to the ignitor, after recieving signal from the pressure switch, then the board is bad.

Make sure the pressure switch is closing, and sending signal to the board.

Posted on Jan 20, 2009

  • Danny Clark
    Danny Clark Jan 20, 2009

    When you finally figure out what is wrong, and realize that there is indeed a 24V failure somewhere. Please repost here.

    To bad you won't be able to re rate then as well..

  • Danny Clark
    Danny Clark Jan 21, 2009

    Your potentially faulty relay could be the 24 problem I reffered to.

    I can't see how a relay would cause high amp draw, but a bad or restricted motor could.

    The 24 V system probably ISN'T causing the high amp draw. That sounds like a secondary problem to me. However a 24V failure WILL cause the blower to do as you described.

    I'd be looking for two problems not one.

    Personally, I'd jumper out/bypass the pressure switch just long enough to see if the ignitor starts to glow/spark. If it does then obviosly the problem lies with the inducer motor/pressure switch.

    Hypothetically, lets say that for whatever reason the inducer motor is going bad, or is all wrapped up with particlaes of that insulation pad that goes between the housing and mounting plate.

    That would cause a high amp draw right?

    Well then you also have the pressure switch pulling in a little, looks good visibly, but not enought to close the contact. You then have a 24V failure and the system shuts down and the blower motor comes on.


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

My Dometic RV AC will not run. It will come on, then almost immediately go off, come on, go off again, most of the time with only seconds between

Error Code E-5 indicates an open or missing temp sensor circuit. Either the remote temp sensor is bad or they didn't plug it in when they changed the circuit board or plugged it in the wrong place.

Mar 16, 2015 | Dometic Heating & Cooling

2 Answers

Fujitsu heat pump error code for floor mount asta18lcc.

if they both flash 5 times it means Compressor Failure. Not a great fault to have. could either be the inverter board or could be a stuffed compressor

May 26, 2014 | Heating & Cooling

1 Answer

LG Lsk244v-3

you must reset the c.breaker from you panel house, and try again.
If the problem persist, replace the battery from r.control and try again. TURN ON manually, and see what happening. If turn on again, is o.k.
If the problem persist the control board inside is faulty .call some electrician or tech for help
God bless you

Jul 13, 2013 | LG Heating & Cooling

2 Answers

I have a Amana unit Model# PGA60C1152F that has a blinking light on the control board it blinks 4 times. That heat will come on then go off but the blower nevers comes on.

look on the inside of the door that you took off and there should be a diagram and on that there will flash code that will tell you what 4 flashes means.i think it is a flame rollout or high limit.

Nov 16, 2012 | Amana Heating & Cooling

1 Answer

Fujitsu inverter air cond. Just stopped working properly. Model outdoor AOT30PMAL indoor unit AST30PBA-W. Code oper. Red led flashes fast continously green led (timer) repeats 13 slow flashes. After power...

It sounds like your inverter is at fault. You will need an inverter tester ( most good service techs will have one ) to prove that the output to the compressor is correct. If the inverter is okay then it will be the compressor at fault with a location error or it is simply seized. A common fault that caused this was the eev remained closed (coil failure ) and caused the compressor to over heat.

May 11, 2010 | Heating & Cooling

1 Answer

American Standard Gas furnace acting weird

I am concerned of the readings you have given. 120 volts to ground, but 168 volts to neutral? And having 10 amps of current at the "ventor", but only 1 amp for the whole furnace worries me, because power for the "ventor" comes through the furnace.

You should not have 168 volts to anything! Unless somehow 240 volts is feeding the system, and there is a medium resistance short somewhere.

The controller boards are sensitive to AC polarity (if you will). Neutral should be tied to neutral on the board. You can check that by testing for voltage between the neutral terminal and chassis ground (assuming the chassis is properly grounded.). The hot leg of incoming power, which should be 120 volts, should be connected to the terminal that says 120 VAC.

If your getting 168 volts AC somehow, then something is wrong, and you need to disconnect power from this unit until you find the cause.

As a heat-A/C tech, you should know the sequence of operation for all furnaces is pretty much the same. The boards, while manufactured by different manufacturers, all operate pretty much the same way.

Let me know your findings in reply and I will attempt to help you more.

Jan 20, 2009 | Heating & Cooling

1 Answer

I have a Carrier Weathermaker SXi. Furnance will not turn on. I shut power off and waited ten minutes and tried to restart. Codes flashing are 12, 31, 32, 33, 41, 42. Can this be started in emergency mode?

Emergency heat is made for this kind of situation.So yes you can.
now for the codes.
code 12= Blower on after power up
code 31=High heat pressure switch or relay didn't close or reopened
code 32=Low heat pressure switch or relay didn't close or reopened
code 33=limit circuit fault(Flame rollout switch is open)
code 41=board fault
code 42=control lockout

Please rate this solution

Jan 17, 2009 | Heating & Cooling

1 Answer

Mod# A-SMH18SA SER# 2791206189 Heat controller mini-split. Cust says lights flashing on board- he resets it, yet it resumes to just flashing at the board. Nothing runs. Long drive out there- any ideas. Was...

First of all, Heat Controller does not mount any schematics on their systems panels at all and supply no information for the service tech to code the light on the outdoor board. This is unbelievable.
Anyway- I found that the electrician had re-arranged breakers in the panel supplying the building and had connected the outdoor heat pump to 120v instead of 240v. He had interpenetrated the connection at the unit that has marked 2(N) as being a neutral connection. I explained that on 120v systems, that is neutral, but on a 240v system, it's L2. The outdoor board was flashing 5 times after the power was turned on for 3 minutes. Voltage at "S" was 38.4v, with this condition and the indoor units lights (all) were flashing every second and beeping as well.
It's running fine now that we are connected to the proper voltage.

Jan 05, 2009 | Heating & Cooling

1 Answer

GE Room Heat/Cool unit will not heat with heat pump

If it was me I would cnage the sensor first. Simply because it is way cheaper than the control board and these sensors are fickle as hell to begin with.

Dec 14, 2008 | GE Zoneline AZ55H07D Air Conditioner

Not finding what you are looking for?
Heating & Cooling Logo

Related Topics:

223 people viewed this question

Ask a Question

Usually answered in minutes!

Top Heating & Cooling Experts


Level 3 Expert

2047 Answers

Dan Webster
Dan Webster

Level 3 Expert

8205 Answers

Cris Sparks
Cris Sparks

Level 2 Expert

338 Answers

Are you a Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides