Which Truma is this?

[PaulandOla]

Hi everyone

It's been quite some time since I've posted anything on here.

My motorhome has been parked up for almost 2 years and not moved. And as a result I'm having various issues and problems which of course is to be expected.

One of the problems which I've got is with the truma s3002 heater (gas fire) I've had my motorhome connected to mains EHP for the past few months and weekly I've been putting the electric side of the fire on for an hour our or so (whilst we have free electric) and all been working well.

But yesterday when I came to light the gas side to check before our little break. Noticed that the fire isn't lighting. Not noises coming from the automatic igniter and no red light on the actual igniter unit. Also blower as stopped working. Done usual checks like checked gas, fuses etc. Got my multi meter out, checked that there is power going to the unit. Yes 14v, done continuity check on the wire going from unit to gas fire. All good. So presuming its the Truma igniter unit. But after removing it and looking at replacement ones. They seem completely different to the one I have. I have no battery at all but have a cable with I believe 5 wires connector (one been permanent live) and one earth. I also have the usual 2 wire connector brown/black and the actual single spark wire.

I'm not sure without dismantling the fire where the other end of this 5 wire connector to the igniter unit goes to and what it does. Can I do without it and just get a new replacement Truma igniter with the battery compartment? and will it work? Probably going to have to dismantle and remove gas fire anyway for cleaning and servicing.

The blower not working is a completely different matter and after some investigation with my multi meter I discovered that one of the pads on the pcb board attached to the blower motor switch as lifted, disintegrated. Please see photos. I will have to be creative and think of a way of using copper wire and attaching it to the board to make a connection. Not paying £165 for new switch. And looks as though they are been discontinued anyway

I will keep you all updated on that repair and do a video as it may be useful for others as after researching it seems like a comman problem.

As usual thanks in advance for any comments, advice or useful information.

Paul

 

[trevormonty]

Check ebay etc for people wrecking caravans, would be cheapest way to pickup a replacement.

 

[PaulandOla]

Just updating this post. So I managed to find out what the issue was. I have a combination of issues some I've fixed some not yet need to order new parts.

Managed to fix the missing trace on fan blower pcb board on switch. So blower working again now. Found out that one if the 2 wires (black & brown) for the micro switch had broken off. Fixed re-soldered them both back on. Much stronger connections now.
The plastic plunger on the gas safety valve was stuck, managed to remove, clean with isopropyl alcohol dry and put back.

But fire still not working. Took it apart again and noticed a break in one of the thermocouple braided cables. Yes you heard me right - two. I'm baffled why my truma gas fire is so different from others. Even in the Truma parts pdf for s3002 model it only shows 1 attached to the burner.

I have some kind of thermostat attached to the inner silver casing. From this there are two braided wire's, one goes to the thermocouple in the burner housing the other to the magnetic plunger switch in the gas safety valve section. I've attached photos for those interested.

Does anyone else have this kind of setup and how do I go about replacing the one broken. It appears they don't sell the ones similar to mine.

Also I'm pretty convinced my igniter unit is kaput but again it's different than others I've seen and the ones for sale. I have not 2 but 4 connector housings on the rear. One single for spark, the double for micro switch, then a 6 pin connector only 5 pins fitted which comprises live and neutral connected directly to van wiring, then 3 other wires which go to the rear of my blower motor. There is also a 3 pin connector (currently not in use). Again does anyone else have this setup or can offer any suggestions.

I'll be very much appreciated.

Paul

 

[ProfJohnL]

I'm sorry, But as an LPG engineer what I have seen in your pictures frightens me. You have stripped the heater out of its installation. Have you sealed the gas pipes as required by law?

Judging by how gnarled the brass nuts are, it would appear to me the heater has been taken apart many times - and stripped down to a level that is not normal.

The removal of the thermostat from the gas valve, has now compromised several seals and that compromises the safe operation of the gas valve. The valve should now be considered unsafe and should not be used, as it could begin to leak unburnt gas.

The braided wires for the flame failure system have been modified judging by solder and exposed core wire on the valve.

As an LPG engineer I could not be confident that your appliance could be made safe to use.

I have seen and had to deal with several similar appliances where the owners have illegally tampered with them, and caused unintentional harm to themselves or members of their families.

This should now be considered a condemned appliance, and a replacement sought and fitted professionally.