Truma C3000 problems

Hi folks, just changed my mh and the new one has a C3400 / C6000 Truma heater seems to be a combined heater and boiler unlike my last which had seperate heater and boiler, ancient but bulletproof, always worked. Am I correct in assuming that it will not work as a heater unless the boiler surrounding it is full with water ? If so therein lies my problem, I spent all evening trying to get it filled, followed the instruction manual, freshwater tank filled, new gas cylinder on, gas isolater switch on, 12V supply on kitchen tap switched to hot and open also, also tried washroom tap and shower hot taps on but could get no waterflow through any of them. The pump was running, it seems to be a submersible type housed inside freshwater tank and provides a fairly powerful flow to all cold taps when switched on. Drain down valves on hot and cold flow circuits are closed and electronic safety type valve thing did'nt appear to be dumping water either. I tried disconnecting the hot water feed pipe from the kitchen tap but nothing flowing from it either and tried syphoning but all to no avail. I'm now thinking that there could be an airlock in the boiler and wondering is there a bleed screw on the boiler ( similar to radiator in a house say) or some other device to ease the filling of boiler. Also wondering if the 'electronic safety type valve thing' beside the boiler has failed and wont allow water to flow through it to the boiler. Anyone ever had similar problems ? all suggestions appreciated.

Thanks Mark,
I've tried shaking the submersible pump up and down inside the F/W tank with the hot taps open but it did'nt resolve the problem either and gave the pump a good 15-20 mins with hot taps open to no avail either. I am considering putting a mains pressure hose onto the pipe leading to the boiler and turning it on slowly and gradually to see if this clears air from the boiler. Wee bit worried that this might be to much pressure and damage the boiler or tap mechanism. I'll have to mull this over though and see what happens.

give me a call later and i'll talk you through a few things..



leisuretechnical solutions
07739 797955

Hi Micheal.
I was just reading the instruction manuel and saw this section "see attachment"
their could be an isolating valve added.

I dont know if this is your boiler or not.

http://dealer.truma.com/_anwei…500_gb.pdf

hope it might help you a bit.

Ps. number 7 in the digram is the hot water connection, shows it has a ( vent valve )