Eberspacher help please.

[Gone sailing]

I have a d3l. I am getting error code F33. The manual states-
F33

"Motor speed varies from specification by more than 10% for longer than 30 seconds. If too slow, check for restriction, and check for short in motor circuit or control unit. If none found, replace blower. If too fast, check for damage to magnetic sensor control on control unit. Replace blower motor if damaged. Replace control unit otherwise."

This seems to fit as the motor speed does seem to vary!
It has had a recent full service.
There are no restrictions to motor or any of the pipes.
Not sure what it means by check for shorts but.... There is no continuity (short)on the motor pins on the ecu. There is continuity (short) on the wires leading to the motor. Is this the problem is the motor had it?
I can keep restarting it and it seems to run ok after the third attempt or so. The motor then runs ok and at a consistent speed.

I am unsure what the magnetic sensor control on control unit is or how to test it? Is this the ecu?
When it refers to control unit is this the ecu?

Thanks for your help
Jim

 

[David2452]

The magnetic sensor control is the part of the control unit (ECU) that receives and uses info to regulate the fan speed, oddly enough I had one today on a different make of heater, much easier when you have a new motor to try and confirm the diagnosis but I would suggest a renewal will be needed unless you have corrosion resistance in the loom or contacts of course, that would make it happen too.

 

[GrahamM376]

As David says above, check contacts for corrosion. I had that fault code and it went away when I cut the spade terminals off and replaced with block connectors. Also now starts without engine running to boost voltage.

 

[Gone sailing]

I have cleaned up all the connectors and they seem ok!
Is it normal for the wires to the motor to be shorting?
I don't understand how you can gut of the spade on the wires and use a block as spade connections are required to plug into the ecu? Or are you saying you pu new spades on?
Also is it not wierd that after third attempt it runs fine!?
Thanks for your input
Jim

 

[GrahamM376]

I don't understand how you can gut of the spade on the wires and use a block as spade connections are required to plug into the ecu? Or are you saying you pu new spades on?
Jim

the spades I cut off were at the joint where the eber wires meet the main loom running to the instrument panel and programmer.

 

[David2452]

If you put a cheap multimeter across the supply and return conductors it will show quite a bit of resistance which you may interpret as a short. I'm not sure what the numbers are on Eber motors unfortunately so cant even tell you where the readings ought to be.

 

[Gone sailing]

Ok thanks, I will check all electrical connections. If not looks like maybe a new ecu. Question is at £300 is it worth replacing when I can pick up a d2 for £400???

 

[Gone sailing]

Well fingers crossed! I replaced the spade connections today and it ran ok for a couple of hours. I guess time will tell but hopefully that's fixed it!
Thanks for your help
Jim

 

[Gone sailing]

Well it is displaying the same error again!!!!
Although this time the motor would not turn at all!
I checked the voltage at the motor wire from the ecu and it had about 10.5v. After a couple of restarts still no motor! I then span the motor by hand and it started working? While it was running the motor was doing a kind of slow pulsing thing but the voltage was remaining the same.

Do we still think this is ecu? Seems a bit wierd to me!
Can I plug the motor to 12v to test it?
Thanks
Jim

 

[David2452]

Sounds more like the air motor itself, that is exactly what was happening with the Mikuni I mentioned earlier, would spin with help but not run consistantly. BTW, the renewal I mentioned earlier was the motor, not the ECU.

 

[Gone sailing]

The magnetic sensor control is the part of the control unit (ECU) that receives and uses info to regulate the fan speed, oddly enough I had one today on a different make of heater, much easier when you have a new motor to try and confirm the diagnosis but I would suggest a renewal will be needed unless you have corrosion resistance in the loom or contacts of course, that would make it happen too.

Ahh yes my apologies I read it wrong.
I have had the plastic surround off the motor and they seem prety sealed up! Are they fixable any serviceable parts?
Thanks

Jim

 

[David2452]

They are not designed to be repaired and you will have to source and match parts as Eber will not sell them, I guess you could have a go as you have little to lose, I have never tried as I suspect my time would come to more than a motor and no guarantee. My full services carry a six month warranty on all non replaced parts unless reported as weak and the owner rejects replacement, maybe your Eber dealer offers the same deal.