Well, i knew saying last week its been in 10years and no problems would be the curse of death!
Well it appears now the thermo Top C is not well.
for info fitted to a 2.4 puma right in tight against the passenger wing to the extent you cant really even see the main unit.
after some suggestions on what i can check on it please.
So history is it stopped working on Sunday and locked itself
I reset the unit earlier today (20A fuse out).
On first fire up post reset it went through the normal cycle, burner fired up and ran for 30/40s, some initial grey smoke when it fired up which was starting to clear. (nothing too excessive but touch more than usual)
fuel pump then stopped, and it went into the shutdown process.
subsequent attempts to turn the unit on and it starts the cycle to come on, fuel pump starts but then nothing happens and it goes into shutdown again.
i believe its getting fuel - grey smoke on the initial start up and it ran on that first start up after lockout reset.
But doesnt do that since. battery voltage is fine.
any suggestions on what i can do to check further before i have to take the unit out - which is going to be a fair bit of work!
I had a similar problem with my thermo top on the range rover it turned out to be the glowpin which I think from memory is dual purpose it reads that the burners fired and preheats the diesel hope this helps
From what you say, it's not igniting, but i think you're already thinking along those lines as without ignition, it will power down.
Your fuel feed is from the main tank if i remember, can you check for air in the line? I'd be looking at fuel related issues before removing the unit.
I would remove the pipe from the exit side of the fuel pump when starting to check for air in the line. If no fuel is coming through then it's a possibility or it's a fuel pump failure.
I have a spare pump if you want to try that, it's old but works, just holler and i'll drop it in a jiffy bag to you
I am on the verge of ripping it out but will certainly check fuel line. Yes its from pickup dropped in from top of tank, Looked today all joints look good and couldn't see any air bubbles in the line. Can't get to connection on unit with it fitted. Also thinking fuel filter issue possibly. Is there a filter in the unit?
Will check pump end and look at pulling pipe as suggested.
James,
The fuel pump won't pump against pressure. If you have a blockage in the fuel line after the pump, it will start up, click a few times ( or may not click at all) then shut down. It may be that after a few months of not using the heater, a blockage has occurred and you need to clear the line. You can see if the pump works by disconnecting the fuel line after the pump, from the pump. If the pump then works you know the fuel line is blocked and needs clearing out.
Hope that helps,
Andrew
Cheers Andrew. will check fuel line. Pump clicks and seems to supply fuel but as yet not split the line to check. it worked perfectly daily for the week leading upto the failure. in fact it been in every other day use since Sept, but fuel blockage/pump issue looks like only thing to check or can be checked really.
You can measure current draw and compare it to specifications. Glow plug takes quite a large current during start of fire in the heater.
With working glow plug and with fuel you have probably blocked the burning chamber. I had simillar problem with Webasto AirTop 2000 - the wire mesh in burning chamber was nearly full of somethnig very hard and unburnt, blocking the right fire-up. After good cleaning and with new mesh and new seals, it works nice. After that experience I have opened another two heaters and all has this problem, but a a bit less blockage, so they were still starting.
It is possible to download webasto service manuals from web.
"Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo
1988 90 Td5 NAS soft top
Cheers
