Truma Ultraflow problem

[Fat.Controller]

I have a Lunar Ultima 524, with a Truma Ultraflow water system.

It's working fine generally, but there seems to be a problem with the pressure switch mounted under the bed-box.

When the pump is being used with the battery charger switched off, alll is fine. Once the charger is turned n however, once a tap is turned off the pressure switch "clicks" loudly for 3 - 8 seconds, and the 12v lights in the van flicker in sync.

Anyone had any experience of this?

Thanks,
Lee.

 

[RogerL]

It's "normal" in the sense that the pressure switch is sensitive to voltage and really needs different settings for 14.4v smart charging / 13.8v power supply / 13.0v smart fully charged / 12.8v fully charged off EHU down to 12.0v discharged - it's a PITA !!
Try adjusting the switch so it doesn't "flutter" when off EHU - or invest in an electronic pressure switch.

 

[YorkieF]

Have a look at
https://www.practicalcaravan.com/forum/technical/55453-truma-smartswitch-instead-of-whale-pressure-switch#441637
I got fed up of the Whale switch back in 2000 and my feelings still haven't changed. As we do a lot of mixed EHU or non-EHU, the position of the whale pressure switch is a pain in the a**e
Also when the Whale was chattering, it used to knock out the ceiling LEDs.
[video]https://youtu.be/sWP2c-UqBu8[/video]