Combustion Fan (austroflamm)

[Mark_ms]

I shut stove down this morning for a top to bottom cleanout and all new gaskets.
Stove was unplugged before working on it and was careful about static electricity.

Plugged back in and started it up, auger comes on, but no combustion fan. pulled it out again to recheck wiring that I disconnected, everything is where it shoud be and tight. Startup again no combustion motor.

Jumped LT switch convection fan comes on but still no combustion fan. Checked the voltage at terminal block and have 120 volts.

The combustion fan is a Merkle circa 1992 and does not look like I have access to electrical connections at motor (inside)
Could it go bad that quickly?? It was working fine prior to shutdown.

 

[heat seeker]

Does it turn freely by hand? Maybe it got jammed.

You could pull the motor out and put voltage directly to it to see if it's okay.

 

[Mark_ms]

Yes it does turn freely.
I might end up having to pull the motor, although I don't have another gasket.....grrr and it's going to 5 below tonight, there is always oil backup

 

[Flammam]

Look here hope it helps

http://pelletstoverepair.com/IntegraTechManual.pdf

 

[Mt Bob]

Plug it in wrong again Mark? https://www.hearth.com/talk/threads/austroflamm-wiring.92601/

 

[Mark_ms]

Plug it in wrong again Mark? https://www.hearth.com/talk/threads/austroflamm-wiring.92601/

LOL nope learned my lesson from that episode. I only pulled 2 wires one blue and one black and used the proper magic marker colors to know where they plugged back in on terminal.
So what do you think blown motor or possibly circuit board?

PS nice to see you back

 

[Mt Bob]

Yours,being older,does it have 2 rocker switches on control panel?Motor should be a ebm papst,and have a second wiring harness going to a 3 wire plug,make sure still plugged in.It is the speed sensor.You can run 120 right to the 2 wires,after unhooking from board,you do not have to remove motor.Motor should have external spinning weight(rotor) does it spin free?

 

[Mark_ms]

and if it

Yours,being older,does it have 2 rocker switches on control panel?Motor should be a ebm papst,and have a second wiring harness going to a 3 wire plug,make sure still plugged in.It is the speed sensor.You can run 120 right to the 2 wires,after unhooking from board,you do not have to remove motor.Motor should have external spinning weight(rotor) does it spin free?

One rocker switch on control panel
Motor is a merkle?? with a date of 1992
It does have hall circuit and connections are tight.
Motor spins free.
How do I connect 120 to motor??
edit do you have a ebm papst motor number??

 

[Mt Bob]

and if it

One rocker switch on control panel
Motor is a merkle?? with a date of 1992
It does have hall circuit and connections are tight.
Motor spins free.
How do I connect 120 to motor??
edit do you have a ebm papst motor number??

Never seen merkle make an outside rotor motor,but anyway unhook from board(power wires) and wire directly to outlet and see what happens.Will go downstairs and grab a motor for the number.

 

[Mt Bob]

Sorry missed part of post,you need 2 sections of wire,plug on 1 end and 2 wire connectors to plug into the 2 wires that unplug from control board.Cut one end off old extension cord,wires can be shoved into the harnness ends temp. if you do not have connectors.

 

[Mt Bob]

ebm papst r2e150-an89-11 m2e068-bf

 

[Mark_ms]

ebm papst r2e150-an89-11 m2e068-bf

Quite the model number, I am too tired too try the wire connection.
Thanks for info. You use that model on your 92?? approx. cost?? did it come with hall wiring?

 

[Mt Bob]

Mine is a 94.That is off the original motor I rebuilt for a spare.Build date is 8/92 on motor.These motors are well over 300.They are very indestructable.Sometimes the wires can break--at the connectors or at the crimp band that retains them to the motor.Fixable.If dropped it can ruin the hall effect sensor inside--not worth fixing.

 

[Mark_ms]

I need to clarify something.

I get the idea of taking an old cord with plug and two wires on other end.

My question I need to clarify is where to connect the two wires into the combustion motor wires
A) the control board
B) the circuit board
C)the terminal block

 

[Flammam]

At the terminal lugs for the motor after it is disconnected from the black terminal block. You do not want to connect to anything but the motor.

 

[Mark_ms]

At the terminal lugs for the motor after it is disconnected from the black terminal block. You do not want to connect to anything but the motor.

Thanks.
have you ever rebuilt combustion motor I am guessing the wires have come loose internally.
We will get back after extension cord therapy

 

[Mark_ms]

Ok connected the extension cord and motor worked so I have a wiring problem somewhere. I hate trouble shooting wiring

 

[Mt Bob]

Ok connected the extension cord and motor worked so I have a wiring problem somewhere. I hate trouble shooting wiring

Good job testing,now you know how.Those wires are very easily plugged into the wrong spot.Check all wiring.If you are sure wiring is correct,unplug auger motor and turn on stove and see if combustion fan runs.Actually just unplugging stove for a few minutes and plugging back in fan should run,even with switch off(safety mode).

 

[Mark_ms]

I am sure connections to fan correct, I did color code them and double check from wiring diagram

Started at power cord traced back to terminal replaced fittings from power cord and replaced fitting from terminal to motor. No luck yet but plugging away.

 

[Mt Bob]

Unplug everything(1 at a time) and look in connectors for a terminal pushed back.Last resort,plug back in turn on and wiggle all connections,very carefully,gloves a good idea.

 

[Mark_ms]

I did pull the all the connections restarted and auger works but still no fan.
I am thinking that I may have a broken wire between terminal to fan inside the sheath, but I don't have time for that as I have got too get ready for work. maybe tonight.
Thanks Bob and Flammann for help so far.

 

[Mt Bob]

I did pull the all the connections restarted and auger works but still no fan.
I am thinking that I may have a broken wire between terminal to fan inside the sheath, but I don't have time for that as I have got too get ready for work. maybe tonight.
Thanks Bob and Flammann for help so far.

Bring home a multimeter if you do not have one.Does not have to be expensive.

 

[Mt Bob]

While I am thinking about it,did you remember to plug air flow sensor back in?

 

[Mark_ms]

While I am thinking about it,did you remember to plug air flow sensor back in?

I never took it out but I did check to make sure it seated properly and connected.
When I was doing all those previous checks earlier today, I would unplug stove before going to terminal, I walked away from it for a bit 9after testing but left it plugged in and when I came back the convection fan was running while the control panel was turned off, which probably means the circuit board is shot.

 

[Mt Bob]

Good chance.Did you start it up?Do not know if you do any electronics work,but have seen this before.It probably has a bad capacitor on the board.By leaving it plugged in,the transformer,which is always on,puts heat into the board and makes it work.Have heated the main board and started stoves,with a hair dryer.Once running,heat of stove keeps it running.