Truma heating - gas/electric mix

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Don't ever feel stupid for asking about something that you are having a problem with.   That's what Club Together is here for.

If it's cold we tend to change over to fuel mix when wanting hot water for a shower, not had a shortage of heat in the van as a result. We have only started to leave the heating on overnight since we now have a van with the CP system. 

David

if heating water alone (no space heating set on) the combi should manage to heat the full tank of water to 60 deg (high setting) in 20-25 mins using the electric 2 (1800w) setting, gas only should be inside 20mins as the Combi 4 uses 2kw (a tad more) and the combi 6 4kw (more than enough)

Note, there is no 'mixed' water heating ability....if this is set the gas will not be used and timings will be as for electric....so mixed 1 will be the same as EL1.....ie SLOW.....when you think it should be quick.

if space heating is also required, this will push the time to fully heat the water out to around 60 mins on EL2.

so, mixed 1 with both space heat AND water heating set, will not only just use EL1 for the water, BUT the space heating will remove some of its capability.....ie VERY SLOW.

also note: if boost is used it has the effect of prioritising the boosted item over others....eg....you have water and heating set on and set heat to boost....water heating will take a back seat reverting to being heated as a by product of the space heating....ie SLOW.

if the water heating is set to boost it will take priority over heating, which will fall away whilst the water will be heated beyond 60 deg and will add two further 'heating cycles' to maintain that heat if the tank isnt used straight away.

the Combi is great, but not perfect, and has its own foibles.

if you can understand these and work with them the unit will deliver everything you need from it.

as above, it can also appear to 'let you down' when its actually working as designed.

David if you run out of gas the system will take 15 minutes to reset itself before it starts to work 

Truma error code, it could be in the 15min cycle? Remedy fault 507 / 516 / 517 (gas supply interrupted)
Restore the gas supply, for example by connecting a full gas cylinder.
Then confirm or delete the fault code by tapping the rotary push button. Please note that the first tap might only activate the backlighting of the control panel.
The heating then starts automatically if there is a heating requirement.
Note: If the fault 507, 516 or 517 is displayed in the heater's control panel, switching the control panel on and off does not help. This does not delete the fault, but blocks the heater for 15 minutes. The heater is also blocked for 15 minutes if the fault 507, 516 or 517 is Deleted User four times without the gas supply being established.
Remedying flashing fault 507 / 516 / 517 (gas supply interrupted)
The fault code 507, 516 or 517 flashes because the heater is still in a 15-minute blocking time. This was possibly caused by the heater control panel being switched off or because the heater's 12-Volt supply was interrupted. The heater is also blocked for 15 minutes if the displayed fault is Deleted User four times without the gas supply being restored.
Wait out the 15-minute blocking time for the heater. During this time, do not switch off the heater's control panel and also do not interrupt the power supply.
As soon as the heater's blocking time has expired, the fault is then displayed permanently rather than flashing. It can now be Deleted User as described in the point above.

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Whilst noting all the members comments and advice, these units can and do break down. In our Lunar Stellar, we've had to replace fuses twice (a fiddly job I left to the dealers) and the dealers have also replaced the PCB, since when it's been OK through this season.

Truma have a very comprehensive set of installation instructions which many converters deem not important enough to follow....

units installed back to front against walls (no access to pcb etc), in cupboards with no ventilation, poor vent pipework, some pipework missing or too small, units not placed in centre of van to be able to evenly distribute heat, customers complain as the unit is in the rear and theres no heat to the front....etc, etc.... 

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Gosh I'm considering another motorhome, ours has had to go due to OH health this yearand a damp related problem plus I wasnt confident enough to drive it at the time. (Long time since I last drove it and all the emotional upheaval.)

Thought we'd go for something smaller and newer that I felt confident to deal with on my own. Reading this I'm put off by more by heating than the choice of vehicles and driving...... Ours was old and until the damp, which could have been solved the guy who bought it has sorted, but beyond the issues I needed this year! The heating and hot water was on or off - simples. Never been cold in there once we had that sorted 😂😂.