Hot Water Playing up

[dazmond]

I've had mine 3 1/2 years and it's recently broken down. I've taken it to the webasto engineer I use and he put a new burner in which fixed it. It then broke down again so I took it back and he sorted out the fuel line which he thinks had a kink in it and reset it and all was good. Then it broke down again. I looked into downloading the software to reset it myself as I've watched the guy do it and it looks pretty easy. Unfortunately you can't download it unless you are a trained Webasto engineer. So I think you will struggle to fix it yourself. As others have mentioned it will have locked out.

Do you charge your batteries every night?
Do you use the heater all day every day?
Do you keep the heater running all day without shut down?

 

[spruce]

The main two reasons for diesel heater failure is lack of fuel and a poor power supply.

A battery in a low state of charge or a knackered battery are the more common reasons of a poor power supply. Included in the poor power supply is poor electrical connections. The most common is corroded fuse terminals in the fuse holder.

 

[RyeCleanLiam]

Do you charge your batteries every night?
Do you use the heater all day every day?
Do you keep the heater running all day without shut down?

I never charge the battery, haven't in 3 years. The webasto engineer actually said it hasn't once in 3 years shown up a low battery fault. I have 2 batteries and a smart charger on my system. I have it running all day every day and it runs through a recirculation back into the tank so never shuts down.
I know what the issue is this time. The webasto engineer sealed the fuel tank (jerry can style) up completely so there was no way for air to get in or out, it caused the tank to suck in on itself which meant fuel wasn't getting through to the burner. It literally just needs a new tank getting and an non return vent putting on it, then the boiler just needs putting on the diagnostics and resetting. I could easily do it myself except I can't get the software.

 

[Patrickr]

The webasto pump will need reconditioning

 

[Pjj]

The webasto pump will need reconditioning

The replacement pump is around £300

 

[Patrickr]

The replacement pump is around £300

Do you have a link ?

 

[Pjj]

Do you have a link ?

Look at technic butlers sight that’s who I deal with not good with links sorry

 

[Limbo_117]

Would would strip out the webasto, sell it as spares or repairs & replace it with a 9kw JP Parking heater.
Yes it's a Chinese copy and many will have a view on this. But they're much cheaper & less to loose if that goes bang. Plus you can get spares for them from Mellor or MV heating. If you don't want hassle of importing one directly, they also sell the heaters (but cost more)
However, this really depends on how technical / confident you are in fitting it yourself.

 

[spruce]

Would would strip out the webasto, sell it as spares or repairs & replace it with a 9kw JP Parking heater.
Yes it's a Chinese copy and many will have a view on this. But they're much cheaper & less to loose if that goes bang. Plus you can get spares for them from Mellor or MV heating. If you don't want hassle of importing one directly, they also sell the heaters (but cost more)
However, this really depends on how technical / confident you are in fitting it yourself.

If anyone is interested.

The 9kw JP Parking heater is the old Webasto Thermo90S/ST range. The latest Webasto 9kw burner is the Thermo Pro 90 which has been it's replacement for at least 5 years now, probably longer.

The latest unit has an upgraded fuel pump which isn't interchangeable with the old pump.

I don't know the exact differences between the old and current burners, but the shape of the burner body is different.
It don't use any less fuel than the older model or heat up any faster.

I heard someone say the new model has automatic altitude compensation, but I don't know if this is correct or not.

I had to buy a replacement fuel pump which I got from Diesel Heater Spares in Turkey.