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Quote: Originally posted by Paul_B on 28/9/2020

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The usual problem with the spluttering is either the pipe is curling up in the aquaroll and drawing air,
The O-rings on the pump housing need replacing or a bit of silicon grease or olive oil applied to them, or a faulty non return valve letting water drain back into the aquaroll, this is usually a from limescale or algae build up on the rubber seal, Check by putting a small container under the pick up pipe
Another look out for is the breather valve on the hot water tank not shutting properly, check to see if the breather pipe is clear rather than looking dirty and its not dripping.
Don't know about the electric side

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Quote: Originally posted by Pickled Onion on 28/9/2020

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Yes, the little yellow lever is the dump valve but also allows water/steam to escape if the heater should stay on permanently. As mentioned, sometimes a bit of detritus gets stuck in thre valve preventing a propper seal, you then pull air in through it. If you have a spare bit of tubing, try and pipe it up as direct as possible to check the function of the pump. You can then add things to the circuit and work backwards until it fails, that will isolate the problem area.

Dave.

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Quote: Originally posted by marg6 on 28/9/2020

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basically when you turn up on site, what do you do with regard of getting water into your system?

depending on your power supply you may need a fully charged battery, i know ours will run without one which would be fine if we only ever used ehu sites, but you do need it for non ehu or in the event of a power cut

you need to make sure the drain valves are shut on the heater and your on board tank, then turn on the power, go to the furthest away tap usually your shower head, and open the hot tap, keep this running until it runs smoothly, this allows air to escape, the same with the bathroom tap and then kitchen, then repeat doing the cold side. all the time making sure your aquaroll doesnt run out of water or you will be drawing air! only once all the air is out do you turn the water heater on.

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Quote: Originally posted by Paul_B on 28/9/2020

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The breather pipe is from the hot water tank, it'll be hung down under the van below the heater tank, it should have a red elbow valve near the top

Have you removed the water pick up pipe from the aquaroll to see if water is draining out (with the pump turned off)

https://www.leisureshopdirect.com/electric/caravan-gas-water-heater/truma-combi-4-6-l.p.-gas-and-electric-heater-spare-parts/elbow-fitting-for-hot-water-outlet-truma-boilers

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Quote: Originally posted by Pickled Onion on 28/9/2020

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Spluttering is air in the system, which is normal when first filling it, however, it should eventually get blown out, but, only if it isn't getting back in again.

Before splashing out (sorry for the pun) on a new head, try connecting it up with some plastic hose, a bucket of water on the input side, and an empty container for the pumped water to output into. There is a very small amount of air to expell is the system and should pump without spluttering in no time, if not, it's the only thing left, the head.

Dave.

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