Harmon p68 distributor blower,feed motor & igniter do not work

[Claudine12801]

Power and status lights come on as does combustion blower.

However the distributor blower, feed motor and igniter do not come on.

If we apply a manual draw by sucking on the hose that runs to low pressure switch the stove works.

We have done the following:
Total cleaning
Pipes clear
Replaced low pressure switch
Replaced low draft sensor
Replaced viewing door gasket
Esp control board switched out

I can't afford to shell out 4000 for a new one.
Stove is 6 years old and we run cubex pellets

 

[Bioburner]

Your a long way from having to get another stove. Still have the ash bin door gasket to possibly be a problem. About $9 to replace yourself. Maybe the rpm of exhaust motor not up to snuff? Its seems to be a vacuum issue and don't know the reasoning to have replaced the board!? There's enough Harman owners here to get it hashed out.

 

[Claudine12801]

What is exhaust motor, is that the same as combustion motor? If so do you know the cost

 

[Claudine12801]

Is there any way to test if the exhaust motor is bad before we order online.

 

[railfanron]

Make sure the fitting where the low pressure tube hooks to the exhaust isn't plugged.
Ron

 

[Claudine12801]

What do you mean the exhaust we have a plastic tube that goes to the low pressure switch up to the muffler in the pellet bin. Thank you

 

[Bioburner]

What is exhaust motor, is that the same as combustion motor? If so do you know the cost

Exhaust-combustion same thing. You will get used to the terms used. Last time I searched was about $110. Usually a bit of a pain to replace as the fan that sits in the exhaust path likes to stick on hard or the set screw becomes way to set or to rusted to get the allen wrench into. When you have the fan cover off you should be able to turn the stove to test and fans should come up to a very good speed. That can be messy so hopefully you can move the stove outside.

 

[Claudine12801]

Is there a way to test if the motor is putting out enough rpm's to provide enough vacuum to trip low pressure switch so pellet stove will start.thank you for your time

 

[Harman Lover 007]

Does the hopper lid have a switch? Stop throwing parts at it....you are spending money unnecessarily. Really does sound like a vacuum issue. Is the fines compartment door secured?

 

[Claudine12801]

Just a latch

 

[Claudine12801]

Yes cleaned and closed

 

[ttdberg]

Make sure the temp dial is turned up high enough to make the stove think it needs to turn on and produce heat. The symptoms you are describing sound like what happens when I intentionally leave the door open on my stove so the combustion motor will run while I'm cleaning it. Triple check the seals on the front door, ash pan door, and hopper lid.

 

[Claudine12801]

Will try all of the above.thank you

 

[MSmith66]

Make sure the fitting where the low pressure tube hooks to the exhaust isn't plugged.
Ron

Does the exhaust blower work? Could be that the pressure switch tube is plugged. Try pulling the tube off the switch and using canned air, squeeze off a blast in the tube. replace and try starting it again.

 

[Claudine12801]

Will try . Thank you for your suggestion

 

[Claudine12801]

No luck on any of the above suggestions... Frustrating is most likely a small thing

 

[ttdberg]

If we apply a manual draw by sucking on the hose that runs to low pressure switch the stove works.

Can you explain in detail exactly what that means? Just trying to visualize what you are doing to make it work?

 

[Bioburner]

ASh bin drawer gasket replaced or checked using the dollar bill test?

 

[Claudine12801]

ttberg- if my husband sucks on the clear tube/hose that runs to the low pressure switch- stove runs great.

Bio-burner- yes to both

 

[Bioburner]

If sucking the hose is getting the stove to run, try the other direction(hose to stove) to see if there is a possible obstruction. Close picture of assembly so we may get an idea of what your describing as a muffler.

 

[Claudine12801]

http://www.stove-parts-unlimited.com/Harman-Hopper-Muffler-and-Fitting-p/1-00-18186618.htm
The small white "filter" located in the hopper I could not get picture to download- link of picture of muffler

 

[Claudine12801]

msmith 66- tried to luck- thank you

 

[Bioburner]

http://www.stove-parts-unlimited.com/Harman-Hopper-Muffler-and-Fitting-p/1-00-18186618.htm
The small white "filter" located in the hopper I could not get picture to download- link of picture of muffler

Unfortunately does not help me visualize how this connects to get any vacuum. Try and PM me and maybe through personal email can get a picture that I may be able to repost. Closest dealer for me to check on this aberration is almost three hour drive.

 

[Claudine12801]

I will have to wait until I get home Thursday night- The tube as far as I know runs up into the back of the hopper and it connects through a hole to the muffler that is in the hopper

 

[Bioburner]

I just poured thru the manual again and they dont even list the muffler in the downloadable version. I think I know why they tried this and should be more tubing and another connection. Maybe someone else with a like system thou rare will chime in. Wonder if anyone at the MN offices have a clue?