Combustion preheater module not working

DreamWave · May 19th, 2018, 14:12

Hi

I have a V50 1.6d 2010 where the parking heater / preheater do not work any more. (Combustion preheater module (CPM))

I looked at VIDA and it gives me this fault "CPM1204 Blower fan Signal missing"
Tried to activate the Water pump and fuel pump and they worked. Tried to activate the blower fan and it failed.
Removed the CPM from the car an took it apart. The blower fan could turn by hand, so I connected power directly to the fan and then it worked perfect.
No strange noice or anything else.
Great now it was just to get all the pieces back together and test.

Now all 3 (water pump, fuel pump and blower fan) works, but the preheater still fails :-(
VIDA trows this error “CPM-4001 Auxilary heater Activated too long”
I have tested the fuel pump at it delivers fuel.
I have tested the blower fan, and it blows.
I have tested the water pump and it pumps.

When I run a test from VIDA to test the preheater I can her the fuel pump, water pump and blower fan. The the preheater produces a lot of smoke and after some time it turns off pumps and fans and tries again with the same result.

I don’t know what to look for now.
Can someone please advice?

DreamWave · May 19th, 2018, 18:16

Done a little more testing

Took the CPM apart again, and measured all connections. An they are all within spec from VIDA
I looked at the flame sensor and it looked fine.
Looked at the glow tube, and it also looks fine.
Nothing is clogging up the path for the airflow.
Tested how much fuel is delivered to the CPM and it is 8.4 cm3 / 90sec at VIDA describes.

When the CPM starts I think I initially get a flame, but as the fan ramps up I think it is blowing the flame out?
When CPM starts I don't have white smoke, it all looks fine. But as the fan ramps up I get like stutter in the burning process and white smoke starts to appear, shortly after it is all white smoke and the CPM stops.
I get temperatures about 200 degrees celsius and then the CPM stops.

I guess it very clear to someone with knowledge about diesel/oil heaters what is wrong.
But I'm lost now.

DreamWave · May 19th, 2018, 22:18

Well... a lot of searching on Internet/youtube/VIDA I found that the CPM is a Eberspacher D5WS 12V (there is also a 24v version)

I first looked for the Volvo/VIDA number for the glow plug, but it did not help much. Either sold out / discontinued with no replacement, or extremely expensive.

Then I searched for the D5WS glow plug, and found this number 252106011000
It can be bought several placed, but it is still not cheap.

While searching for the glow plug I found this website
https://www.pfjones.co.uk/advice-cen...ing-guide.html

Problem:

Code:

"Heater makes two attempts to start, may smoke for a while and then it stops"

The heater tries to start 2 times and smokes a lot before stopping

Possible reason:

Code:

1. Do the fuel quantity check, if the amount of fuel is insufficient than check the fuel pick-up pipe, fuel lines and connections, fuel filter on the pump, replace the filter or pump if necessary.
2. Check the glow pin and replace atomizing screen. Clean combustion tube (including it’s all air ways) and the heat exchanger.

1. I did a fuel check, and it is within spec.
2. I did check the glow pin. It measures within spec and if I start the CPM without fuel hose connected it smokes until all the diesel is gone. So I guess that the glow plug is OK.
I did not replace the atomizing screen (or lining or strainer. It has many names).
I did some cleaning of the combustion chamber, but I guess that it could be better.

I ordered a new atomizing screen (or glow pin screen) 252121990113
I have to wait until it arrives. Then I'll try to clean the combustion chamber better and install the new atomizing screen and se what happens.

I'll report back when done.

DreamWave · May 25th, 2018, 19:37

As promised, here is a followup

I got the new atomizing screen (or glow pin screen) 252121990113. It includes 2 o-rings.

Took the CPM apart again. Cleaned everything again and installed the new atomizing screen (or glow pin screen). Put it all back together and installed the CPM in the car.

NOW IT WORKS

So all I needed was a new atomizing screen (or glow pin screen) with part number 252121990113

Phredman · Dec 24th, 2018, 17:24

Thanks for the feedback. I have similar problems, and eliminated options. Maybe I need a new glowplug.

May 19th, 2018, 14:12	#1
DreamWave New Member Last Online: Jan 7th, 2022 21:09 Join Date: May 2018 Location: Aarhus	Combustion preheater module not working Hi I have a V50 1.6d 2010 where the parking heater / preheater do not work any more. (Combustion preheater module (CPM)) I looked at VIDA and it gives me this fault "CPM1204 Blower fan Signal missing" Tried to activate the Water pump and fuel pump and they worked. Tried to activate the blower fan and it failed. Removed the CPM from the car an took it apart. The blower fan could turn by hand, so I connected power directly to the fan and then it worked perfect. No strange noice or anything else. Great now it was just to get all the pieces back together and test. Now all 3 (water pump, fuel pump and blower fan) works, but the preheater still fails :-( VIDA trows this error “CPM-4001 Auxilary heater Activated too long” I have tested the fuel pump at it delivers fuel. I have tested the blower fan, and it blows. I have tested the water pump and it pumps. When I run a test from VIDA to test the preheater I can her the fuel pump, water pump and blower fan. The the preheater produces a lot of smoke and after some time it turns off pumps and fans and tries again with the same result. I don’t know what to look for now. Can someone please advice?

May 19th, 2018, 22:18	#3
DreamWave New Member Last Online: Jan 7th, 2022 21:09 Join Date: May 2018 Location: Aarhus	Well... a lot of searching on Internet/youtube/VIDA I found that the CPM is a Eberspacher D5WS 12V (there is also a 24v version) I first looked for the Volvo/VIDA number for the glow plug, but it did not help much. Either sold out / discontinued with no replacement, or extremely expensive. Then I searched for the D5WS glow plug, and found this number 252106011000 It can be bought several placed, but it is still not cheap. While searching for the glow plug I found this website https://www.pfjones.co.uk/advice-cen...ing-guide.html Problem: Code: "Heater makes two attempts to start, may smoke for a while and then it stops" The heater tries to start 2 times and smokes a lot before stopping Possible reason: Code: 1. Do the fuel quantity check, if the amount of fuel is insufficient than check the fuel pick-up pipe, fuel lines and connections, fuel filter on the pump, replace the filter or pump if necessary. 2. Check the glow pin and replace atomizing screen. Clean combustion tube (including it’s all air ways) and the heat exchanger. 1. I did a fuel check, and it is within spec. 2. I did check the glow pin. It measures within spec and if I start the CPM without fuel hose connected it smokes until all the diesel is gone. So I guess that the glow plug is OK. I did not replace the atomizing screen (or lining or strainer. It has many names). I did some cleaning of the combustion chamber, but I guess that it could be better. I ordered a new atomizing screen (or glow pin screen) 252121990113 I have to wait until it arrives. Then I'll try to clean the combustion chamber better and install the new atomizing screen and se what happens. I'll report back when done.

May 19th, 2018, 18:16	#2
DreamWave New Member Last Online: Jan 7th, 2022 21:09 Join Date: May 2018 Location: Aarhus	Done a little more testing Took the CPM apart again, and measured all connections. An they are all within spec from VIDA I looked at the flame sensor and it looked fine. Looked at the glow tube, and it also looks fine. Nothing is clogging up the path for the airflow. Tested how much fuel is delivered to the CPM and it is 8.4 cm3 / 90sec at VIDA describes. When the CPM starts I think I initially get a flame, but as the fan ramps up I think it is blowing the flame out? When CPM starts I don't have white smoke, it all looks fine. But as the fan ramps up I get like stutter in the burning process and white smoke starts to appear, shortly after it is all white smoke and the CPM stops. I get temperatures about 200 degrees celsius and then the CPM stops. I guess it very clear to someone with knowledge about diesel/oil heaters what is wrong. But I'm lost now.

May 25th, 2018, 19:37	#4
DreamWave New Member Last Online: Jan 7th, 2022 21:09 Join Date: May 2018 Location: Aarhus	As promised, here is a followup I got the new atomizing screen (or glow pin screen) 252121990113. It includes 2 o-rings. Took the CPM apart again. Cleaned everything again and installed the new atomizing screen (or glow pin screen). Put it all back together and installed the CPM in the car. NOW IT WORKS So all I needed was a new atomizing screen (or glow pin screen) with part number 252121990113

Dec 24th, 2018, 17:24	#5
Phredman New Member Last Online: Dec 25th, 2018 00:49 Join Date: Nov 2018 Location: Starnberg	Thanks for the feedback. I have similar problems, and eliminated options. Maybe I need a new glowplug.

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