Eberspacher heater

[pondfish]

Hi all I have just fitted a brand new eberspacher D2 heater on my boat and a 801 modulator,
It fires up great works fine but it don't switch off when it reaches the set temp,
Any ideas ????

 

[Cardo]

Hi all I have just fitted a brand new eberspacher D2 heater on my boat and a 801 modulator,
It fires up great works fine but it don't switch off when it reaches the set temp,
Any ideas ????

I have the same setup. The heater rarely switches itself off, it will usually slow down to the lowest setting and sit there. As long as the temperature doesn't go higher than around 2 to 3 degrees hotter than what you've got it set to, it won't switch off.

 

[pondfish]

It don't slow down it was 8 degrees in the boat set the heater to 12 degrees and it was still going at 25 degrees the modulator is picking up the temp to show temp in the boat so it should switch off or slow to tick over,
Any ideas i'm thinking it must be the modulator at fault,
Has anybody else had this problem with the 801 modulator

 

[Cardo]

It don't slow down it was 8 degrees in the boat set the heater to 12 degrees and it was still going at 25 degrees the modulator is picking up the temp to show temp in the boat so it should switch off or slow to tick over,
Any ideas i'm thinking it must be the modulator at fault anybody else had this problem with the 801 modulator

Now that is unusual. Are you sure the pins on the 801 are plugged in correctly? Where is the heater? Is it somewhere where it would remain cold, or would it also have warmed up as the cabin warmed up? The heater has a built-in thermostat which it defaults to if it's not receiving an external (from the 801) temperature signal. Could be worth unplugging and reconnecting the modulator, as an easy test.

 

[pondfish]

The heater is in a locker under the helm, (locker nice and warm)
The air intake pipe go's into my gunnels for fresh air (but cold)
Wires been checked all 6 wires in right order,
It's all brand new but i'm wondering if the 801 modulator is faulty ??

 

[Pendana]

If the D2 is anything like my D4 the default temperature sensor is at the air intake of the unit.
You need to bring a separate wire from the diagnostic socket of the D2 to the 801 modulator - the standard harness does not have that additional wire.

 

[Cardo]

If the D2 is anything like my D4 the default temperature sensor is at the air intake of the unit.
You need to bring a separate wire from the diagnostic socket of the D2 to the 801 modulator - the standard harness does not have that additional wire.

My D2 only has a 6 wire harness and the heater does use the 801's built in temperature sensor.

 

[pondfish]

Yes mine only has 6 wires with a built in temp sensor but don't seem to be working ???

 

[Cardo]

Yes mine only has 6 wires with a built in temp sensor but don't seem to be working ???

Is the temperature reading on the display changing? Is it more or less accurate? If so, it would suggest the sensor in the 801 is indeed working. But there's some fault between the 801 and the heater. Obviously, the easiest test would be to try a different 801 and see what happens then. Know anyone you can borrow one from?

 

[Pendana]

This from the Butler Technik we site

http://butlertechnik.com/download/A...ontroller_Installation_instruction_manual.pdf

Please note - The built in temperature sensor is ideal for temperature sensing at the controller mounting location. However the wiring harness supplied with the Eberspacher Airtronic Heaters sold in the UK will not automatically default to this sensing method.
If you require temperature sensed at the controller mounted location (as an alternative to temperature sensing at the heater inlet), then the grey wire from the digital controller must be connected to the grey wire in the heater wiring harness (this can be found at the heater diagnostic plug). Also for the diagnostic function on some heaters the blue & white wire may not be available at the standard controller wiring connections, in which case a wire will need to be routed and connected from the blue & white connection at the diagnostic plug.

 

[pondfish]

Is the temperature reading on the display changing? Is it more or less accurate? If so, it would suggest the sensor in the 801 is indeed working. But there's some fault between the 801 and the heater. Obviously, the easiest test would be to try a different 801 and see what happens then. Know anyone you can borrow one from?

Yes the temp reading on the display is working it showed 8 degrees when I got on the boat I set it to 12 degrees turned the heater on and it stayed running until 25 degrees showing on the sensor 90 mins later

 

[pondfish]

This from the Butler Technik we site

http://butlertechnik.com/download/A...ontroller_Installation_instruction_manual.pdf

Please note - The built in temperature sensor is ideal for temperature sensing at the controller mounting location. However the wiring harness supplied with the Eberspacher Airtronic Heaters sold in the UK will not automatically default to this sensing method.
If you require temperature sensed at the controller mounted location (as an alternative to temperature sensing at the heater inlet), then the grey wire from the digital controller must be connected to the grey wire in the heater wiring harness (this can be found at the heater diagnostic plug). Also for the diagnostic function on some heaters the blue & white wire may not be available at the standard controller wiring connections, in which case a wire will need to be routed and connected from the blue & white connection at the diagnostic plug.

Just been on the phone to Butler Tecknic and what they said is
You have 6 wires coming from the 801 modulator if you want the heat sensor on the 801 to work Do not connect the Grey wire then the heater will turn down at your set temp,
So I will disconnect the Grey tomorrow at let you all know how I get on,
Thanks all for your help and input

 

[Cardo]

Just been on the phone to Butler Tecknic and what they said is
You have 6 wires coming from the 801 modulator if you want the heat sensor on the 801 to work Do not connect the Grey wire then the heater will turn down at your set temp,
So I will disconnect the Grey tomorrow at let you all know how I get on,
Thanks all for your help and input

That sounds unusual. I've definitely got all 6 wires connected up in my setup and I'm pretty certain the heater's using the modulator's thermostat (the heater's in the cockpit locker, which remains far cooler than the cabin). Would be interested to hear how you get on.

 

[KevB]

Is the grey wire in the controller connected to the grey wire in the heater diagnostic socket. If not it defaults to the temp sensor in the heater. Not all looms connect this grey wire by default.

I have an 801 with a D4 and needed to connect the grey wire to make the temp sensor in the 801 the default. make sure the grey wire is connected through all the looms to the heater.

 

[pondfish]

Is the grey wire in the controller connected to the grey wire in the heater diagnostic socket. If not it defaults to the temp sensor in the heater. Not all looms connect this grey wire by default.

I have an 801 with a D4 and needed to connect the grey wire to make the temp sensor in the 801 the default. make sure the grey wire is connected through all the looms to the heater.

The grey wire is connected on the 801 modulator plug at the moment and the heat sensor in the 801 don't work,
So tomorrow I will disconnect the grey wire and fire it up to see if the temp sensor on the 801 will work.

 

[pondfish]

Well I tried all ways with the grey wire still no luck I emailed the company and they are looking into it