Truma 6002 overheating?

[MrDLantz]

Hey guys,

So tonight was our first night out with the motorhome this season. Everything have been working beautifully for the last 2 years of camping, including my Truma 6002 gas-powered heater.

Last night I turned on the heater to hot air for the night. 4 hours later, in the middle of the night, I woke up from a bang and hiss. The upper transparent hose for air bleed and overpressure had blown off with hot water everywhere inside the cabinet. I quickly released the safety valve, emptied the boiler and turned off the water pump.

I had previously had a leaking valve, so I fixed this by clamping a hose on the outlet on the boiler, plugged the main inlet on the valve and put the valve further down on the air bleed hose. I figured this would have the same function as before. Please see pictures. This solution have been working fine for the previous season.

Anyway. With kids being asleep and the temperature being cold outside I needed to get it running again. I restarted the filling process, bled the air through the taps and started it back up. It turned on and worked fine. After a while it was nice and warm in the motorhome again.

5 hours later, early morning, it happened again.. Blew the air bleed/overflow hose right off.

The simple answer could be to replace the valve with a new original valve, but I can't find it anywhere (I live in Sweden). It has, however, been working fine like this last year. So something else must've caused the overheating. Water/air could not get passed the valve and blew the hose instead. If I flip the valve water just pours through when the pump is on..

What could cause this? Please help!

 

[Wombles]

Hi & welcome MrDLantz! Hopefully someone will post with advice soon...

 

[MrDLantz]

I got in contact with Truma and was helped by a great service technician. He was sure the air valve is working like it should, even with my quick fix moving it further down the hose. Instead he suggested the safety valve is malfunctioning. It serves two purposes: Frost protection which automatically dumpes the water if the temperature gets too low and over pressure protection which dumpes the water if it goes higher than 3,5 bars. It will then stay open until pressure is normalized and close again. The newer model that I have ordered is apparently fully mechanical and does not need 12V feed like the old one.

It was rather pricy, but I have now ordered one along with a new air valve (figured I might as well replace it while I'm at it!)

The part number for the safety valve from Truma is 3010430 (FrostControl) if you have flexible hoses. There's also one available for hard lines.

 

[Wombles]

I got in contact with Truma and was helped by a great service technician. He was sure the air valve is working like it should, even with my quick fix moving it further down the hose. Instead he suggested the safety valve is malfunctioning. It serves two purposes: Frost protection which automatically dumpes the water if the temperature gets too low and over pressure protection which dumpes the water if it goes higher than 3,5 bars. It will then stay open until pressure is normalized and close again. The newer model that I have ordered is apparently fully mechanical and does not need 12V feed like the old one.

It was rather pricy, but I have now ordered one along with a new air valve (figured I might as well replace it while I'm at it!)

The part number for the safety valve from Truma is 3010430 (FrostControl) if you have flexible hoses. There's also one available for hard lines.

Good to hear that you got it sorted plus the info. may help others too

 

[MrDLantz]

Well I hope they're right and that this will solve my issue. I guess I'll find out next time we're camping. I'd prefer not to be a midnight plumber again!

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