Water heater problems

[gus-lopez]

Well the Truma stopped working a while ago. Eventually had a look at the pcb & found something that had obviously been badly soldered from the outset & had damaged the board so linked out with a small wire. replaced turned on S/valve clunks piezo goes ,then nothing . Doesn't light ?
Fiddled for a while & as occasionally there was a damp patch I stripped the lot out. Found burner blocked solid with dust/earth ? If I didn't have a witness, my nephew, I would seriously believe that it hadn't worked before & I was dreaming it.
Anyway silver soldered inlet & outlet pipes. cleaned burner , assembled on its own & connected to temp. gas supply , turned on switch & volia , perfect .
If I tried it once ,I tried it dozens of times. Then reassembled it all & refitted all to van. Left Water fill up & gas bottle until today . Done that this a.m. & turned on & ..........nothing . Tried everything & this is exactly what it did the first time & never worked for weeks & then suddenly would open S/valve & attempt to light . Anyone any ideas ? I¡ve trawled the internet but cannot find anything relating to mine as it is a BO 10litre . B103 , gas only model & is obviously a very early model.

 

[snoopey2]

Hi,
Surely it can only be something in the van power supply side, corroded fuse carrier maybe, if it ran ok on the bench.

David

 

[gus-lopez]

I cannot find anything. When you actually operate the on/off switch there is power returned to the pcb & down to the S/v & back. Problem is the s/v is not opening & if it doesn't open then the rest of the operation doesn't happen. I'm sure it is something simple but can't find it .

 

[jockaneezer]

Did you hear or feel the solenoid click in ? If you're sure the power is getting there, it can only be the solenoid sticking or blocked up ?
We had a problem with an old gas only basic boiler in my brother's van, the alloy bodied solenoid had corroded inside (white crud) it was a sealed unit, but we prised it apart, cleaned it and recrimped it shut.

 

[gus-lopez]

When the solenoid operates you can both hear & feel it'clunk'. Which it isn't doing at the moment.
Yes the power on switching on goes to the S/v.
Looks like it's all going to have to come out again !

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[gus-lopez]

Well having done a few costings , decided that at 25+ years old it should be retired gracefully . Also I tracked a new one down for 377€ less 3% so went down that route. Additionally I now have ,a water drain down point, an over pressure/ temp vent on the hot outlet & hot water ! Lovely