Actually I allready did some time ago. Unfortunately, my model is new to him. But: as soon I get better from my flu, I install my modificated pcb, and test it. If it does not work, I change the chip and if it is still without pump current, I will give it to local expert (they have huge repair queue presently). Our cold days will last about one month still, so I should repair it relatively quick or it does not matter anymore for this winter :}

Edit: I swapped output to an other FET port in that circuit. Didn't help. Cuircuitry worked exatrly in a same way than before (so, I didn't break anything extra ;) )Ok, it was too difficult job to me and my tools anyway (too small connections). So it is possible that my connection was wrong soldered. I ordered new chip and will have it in a couple of days. Local electronic shop can do the swapping without a problem. I will then once again check all the cables & connections, put everything together...and hope the best. If it does not work, I will give it to expert.

jaki, if you'll apply a lot of flux or colophony then solder will hold to the copper and "get away" it self from the laminate.

Best regards
Greg

In the absence of a 'scope, a logic probe with a cmos setting would pick up and show the pulses.

A big thanks to Frenchmike for fixing 2 pcb's for me.Both FBH's are now running well.The man is a genius :)

Good for You, I even swapped (or electronic shop did it) new output stage for fuel pump, but result was same than before. I cheked fuel pump cabeling once again but everything was ok.
I found from motor-talk a couple gus with similar eerror codes. No answer there either :(
I give it up. I will visit an expert when I hve little more time.

Sad story to my Webasto.
I had problem with my battery (original from year 2004), and there was also litlle contact problems with battery cabling.
I managed fire my car with jump start and bought new battery. Everything else is ok, except this FBH. First: I couldn't get contact to it with my DIS. Then I realise that its fuse was blown. I replaced it and the I heard aux water pump running on all the time. Ahd: this is serious: I couln't still get any contact to it :( Even when car totally switched off water pump remains on, meaning I was forced t oremove that fuse.
So my unit seems to be very sick.

Hi Mike,

Any idea which component causes the error message "Glowpin flame sense interrupted- Short circuit". I found one 4.7K resistor open circuit, but the error is still there. The glowpin is not short circuit because i tested it in another heater.

Hi,

The quickest way is checking all the resistors...

It was a solder joint this time. It seems the chewing gum has attacked the joints on the resistors which was very confusing because when measuring the resistors on the top of their caps they read fine, but when I scraped away the varnish on the pads and measured there, they read open circuit. Ended up replacing 2 x 4.7K resistors and 1 x 10K one.


That chewing gum has a lot to answer for.