Chattering Truma (1 Viewer)

[Homer-Adria]

we are currently up at La Plagne Village and our Truma heater has started to play-up. When it’s been running for a few hours, regulating at thermostat temp, it will produce a chattering noise and then switch off, red light then comes on.
I wonder if the servo gas valve is worn and struggling to open/close?

It’s quite an old heater (2001) and I’m not sure of its service history.

Any help/suggestions please

 

[Homer-Adria]

Just to update the Truma problem... I was outside the van by the boiler exhaust and the “chattering” noise seems more of a thudding/popping.. the boiler seems to be struggling to ignite.

 

[sdc77]

I wonder if it's something to do with the fan ... if that's failing then it won't ignite.

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[Homer-Adria]

The fan seems to be working... comes on at low level when Truma is switched on and blows hard when thermostat set high.

 

[Robert Clark]

My guess is that the water heater is ‘kettling’ due to limescale buildup.

 

[WillH]

Fuel starvation , gunged up regulator?

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[tonyidle]

There are two fans: one to blow hot air around the van and the other to supply air for combustion. It's the combustion fan that can cause problems. Like a lot of modern gas heaters it doesn't work as you might imagine. The gas doesn't suck in air to burn as it exits the jet; a controlled volume of air is blown through a venturi. The low pressure (suction) at the venturi draws in an appropriate amount of gas to burn. It follows that the combustion fan is critical to successful operation. For example a build up of dirt in/on the fan & venturi will cause problems.

 

[Homer-Adria]

Sounds like we need to have it serviced. I had a Habitation Service just last summer but the Truma was not included.
There’s probably nothing I can do whilst we are on this trip other than hope it does not pack-up completely.
As always, thank you for the help

I’m now hitting the piste ⛷