Truma cp switches off when mains on

Sorry, this could be teaching Granny to suck eggs.

Do all your other mains electric devices work?.

Remember your circuit breaker switches are all up for on and down for off. And  your 12 volt supply has to be on.

I've had all sorts of panics at the beginning of the season when I'd failed to check everything was switched on. Including pressing the button at the plug on the supply pole!

All others work. Cp panel only minimum settings 2. Mains trips out cp. No fuse gone. Truma heater had no lights or sign of function on anything including gas.

"Cp panel only minimum settings 2."

sorry, but ive no idea what this means.....

with the mains off, and running from gas only, 12v needed, does the panel work as you think it should....ie can you operate all functions (hot water, heating, temp control etc) from the CP?

if so, the system is working (and gas may have to be a work around).

however, if you plug in the mains, does the whole unit trip out?

if so, sounds like a short somewhere...

if not, but system wont 'work' on electric, do you have a Sargent system (auto trail, auto sleepers, swift, etc....)?

if so, the 'space heating' and 'water heater' buttons need to be pressed in order to run these from mains...

cant add much else im afraid...

There are no functions on the cp except the spanner to do reset, set 12/24 time lang etc. The other function is time. No other displays are available. No caravan temp, no water temp, no fan nothing. Cp has no triangle to display errors either. Mains plugged in microwave beeps to indicate power on, but as soon as u switch mains power button on it trips out CP. If you disconnect everything, connect battery and power off the Cp it switches off. However if you connect the mains and switch it on and then off the Cp switch on, but still with limited functions. Bailey pursuit 530/4 caravan. Boiler shows no signs of life, no less on, which indicates no power to boiler to me

unplug the mains. turn off the 12v. this should shut down the CP panel.

now turn on the 12v...the panel should tirn on or, if not, press the rotary knob and this should turn it on.

push the rotary button, select fuel type and set the fuel to gas.

now try to turn on the water heater, BUT, if its a Sargent system, you will need to turn the WATER HEATER button on...orange light..

set water temperature to ECO or HOT....

does this work??

if so, the system is working ok on gas...

lets get there before trying to move on.

good luck.

I have, although not identical, a similar situation with the CP Control and heating in my Bailey motorhome. I get some strange error codes up which are not amongst those listed. I do have power to the boiler as I can see the lights on the rear. Resetting makes no difference. I have not yet entirely disconnected the 12v by removing the battery lead. My suspicion is that it is something to do with the fan as it won't work, and the error codes don't immediately appear,  if you try and set it on the cooling mode. Goes in for service next week so hopefully dealer can sort it?

David

Tried alot things. 12 v on it's own. 12 v followed by mains. Tried mains followed  by 12v. Still same. All fuse switch off etc etc turning rotary on off holding it down.reset still same answer no controls on CP

"it showed fault code that no mains electric was not connect so connected and done factory reset."

i dont know of an error code for 'no mains connected' as running on gas-only doesnt require mains.....UNLESS the CP is set to EL1 or EL2 which will require mains to run.

i certainly dont understand whats happening as the control unit seems to be acting very oddly....perhaps completely disconnecting the leisure battery for a few mins might invoke a (successful) panel reset.

failing that, it sounds like an electrical fault (possibly a PCB failure) and needs expert attention.

good luck.

David, to get ahead of the game and perhaps give your dealer a bit more to go on you could try the test i described above....ie try the unit on gas only and this will confirm if the unit has the fault (fan not working?) on electric only or on all fuels...

if it fires up OK on gas, then the issue is linked to mains running...if it wont run properly on gas then its a consistent issue on all fuels...

in which case, as with the OP, this could be a PCB issue...

good luck.

ps....FWIW ive found the CP Plus versions (weve had two) to be incredibly reliable and havent had a fault/error on either in over five years other than 'youve run out of gas'.

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